Quarterly report pursuant to Section 13 or 15(d)

DEBT AND FINANCING ARRANGEMENTS - Carrying Value of Outstanding Debt (Detail)

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DEBT AND FINANCING ARRANGEMENTS - Carrying Value of Outstanding Debt (Detail) - USD ($)
Apr. 01, 2020
Sep. 30, 2021
Apr. 01, 2021
Jan. 15, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 22,274,000,000        
Total debt   22,106,000,000     $ 24,654,000,000  
Less current maturities   (1,268,000,000)     (2,623,000,000)  
Long-Term Debt and Finance Leases   20,838,000,000     22,031,000,000  
Senior notes | 3.125% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 0        
Debt instrument, stated interest rate   3.125%   3.125%    
Total debt   $ 0     1,507,000,000  
Senior notes | 2.050% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 0        
Debt instrument, stated interest rate   2.05% 2.05%      
Total debt   $ 0     700,000,000  
Senior notes | 2.450% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,000,000,000        
Debt instrument, stated interest rate   2.45%        
Total debt   $ 1,016,000,000     1,028,000,000  
Senior notes | 2.350% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 600,000,000        
Debt instrument, stated interest rate   2.35%        
Total debt   $ 600,000,000     599,000,000  
Senior notes | 2.500% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,000,000,000        
Debt instrument, stated interest rate   2.50%        
Total debt   $ 998,000,000     997,000,000  
Senior notes | 2.800% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 500,000,000        
Debt instrument, stated interest rate   2.80%        
Total debt   $ 498,000,000     498,000,000  
Senior notes | 2.200% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 400,000,000        
Debt instrument, stated interest rate   2.20%        
Total debt   $ 399,000,000     398,000,000  
Senior notes | 3.900% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,000,000,000        
Debt instrument, stated interest rate   3.90%        
Total debt   $ 996,000,000     995,000,000  
Senior notes | 2.400% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 500,000,000        
Debt instrument, stated interest rate   2.40%        
Total debt   $ 498,000,000     498,000,000  
Senior notes | 3.050% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,000,000,000        
Debt instrument, stated interest rate   3.05%        
Total debt   $ 994,000,000     993,000,000  
Senior notes | 3.400% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 750,000,000        
Debt instrument, stated interest rate   3.40%        
Total debt   $ 746,000,000     746,000,000  
Senior notes | 2.500% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 400,000,000        
Debt instrument, stated interest rate   2.50%        
Total debt   $ 397,000,000     397,000,000  
Senior notes | 4.450% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 750,000,000        
Debt instrument, stated interest rate   4.45%        
Total debt   $ 743,000,000     743,000,000  
Senior notes | 6.200% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,500,000,000        
Debt instrument, stated interest rate   6.20%        
Total debt   $ 1,484,000,000     1,483,000,000  
Senior notes | 5.200% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 500,000,000        
Debt instrument, stated interest rate   5.20%        
Total debt   $ 494,000,000     493,000,000  
Senior notes | 4.875% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 500,000,000        
Debt instrument, stated interest rate   4.875%        
Total debt   $ 491,000,000     490,000,000  
Senior notes | 3.625% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 375,000,000        
Debt instrument, stated interest rate   3.625%        
Total debt   $ 368,000,000     368,000,000  
Senior notes | 3.400% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 500,000,000        
Debt instrument, stated interest rate   3.40%        
Total debt   $ 492,000,000     491,000,000  
Senior notes | 3.750% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,150,000,000        
Debt instrument, stated interest rate   3.75%        
Total debt   $ 1,137,000,000     1,137,000,000  
Senior notes | 4.250% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 750,000,000        
Debt instrument, stated interest rate   4.25%        
Total debt   $ 743,000,000     742,000,000  
Senior notes | 3.400% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 700,000,000        
Debt instrument, stated interest rate   3.40%        
Total debt   $ 688,000,000     688,000,000  
Senior notes | 5.300% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 1,250,000,000        
Debt instrument, stated interest rate   5.30%        
Total debt   $ 1,231,000,000     1,231,000,000  
Senior notes | Floating-rate senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   0        
Total debt   0     350,000,000  
Senior notes | Floating-rate senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   400,000,000        
Total debt   400,000,000     399,000,000  
Senior notes | Floating-rate senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   500,000,000        
Total debt   500,000,000     499,000,000  
Senior notes | Floating-rate senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   1,039,000,000        
Total debt   1,027,000,000     1,027,000,000  
Senior notes | 7.620% debentures(1)            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 276,000,000        
Debt instrument, stated interest rate 7.62% 7.62%       8.375%
Total debt   $ 280,000,000     281,000,000  
Debt instrument, term 10 years          
Senior notes | Canadian senior note 2.125%            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 588,000,000        
Debt instrument, stated interest rate   2.125%        
Total debt   $ 586,000,000     583,000,000  
Pound Sterling notes | 5.500% notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 89,000,000        
Debt instrument, stated interest rate   5.50%        
Total debt   $ 88,000,000     90,000,000  
Pound Sterling notes | 5.125% notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 612,000,000        
Debt instrument, stated interest rate   5.125%        
Total debt   $ 581,000,000     586,000,000  
Euro Senior Notes | 0.375% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 811,000,000        
Debt instrument, stated interest rate   0.375%        
Total debt   $ 808,000,000     857,000,000  
Euro Senior Notes | 1.625% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 811,000,000        
Debt instrument, stated interest rate   1.625%        
Total debt   $ 807,000,000     856,000,000  
Euro Senior Notes | 1.000% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 579,000,000        
Debt instrument, stated interest rate   1.00%        
Total debt   $ 576,000,000     611,000,000  
Euro Senior Notes | 1.500% senior notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 579,000,000        
Debt instrument, stated interest rate   1.50%        
Total debt   $ 575,000,000     611,000,000  
Facility notes and bonds            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   320,000,000        
Total debt   320,000,000     320,000,000  
Other debt            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   3,000,000        
Total debt   $ 3,000,000     $ 5,000,000