Annual report pursuant to Section 13 and 15(d)

SHAREOWNERS' EQUITY - Activity in Accumulated Other Comprehensive Income (Loss) (Detail)

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SHAREOWNERS' EQUITY - Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year $ (5,997) $ (4,994)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 97 48 $ (149)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax 2 6 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (335) 72 485
Balance at end of period (7,113) (5,997) (4,994)
Foreign currency translation gain (loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year (1,078) (1,126) (930)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 97 48 (149)
Balance at end of period (981) (1,078) (1,126)
Aggregate adjustment for the period, tax effect (36) 10 37
Foreign currency translation gain (loss) | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 0 0 (47)
Unrealized gain (loss) on marketable securities, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year 4 (2) (2)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax 6 11 (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (4) (5) 3
Balance at end of period 6 4 (2)
Current period changes in fair value, tax effect 1 4 (1)
Reclassification to earnings, tax effect (1) (1) 1
Unrealized gain (loss) on cash flow hedges, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year 112 40 (366)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (192) 195 429
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (143) (123) 56
Balance at end of period (223) 112 40
Current period changes in fair value, tax effect (61) 61 135
Reclassification to earnings, tax effect (45) (39) 18
Unrealized gain (loss) on cash flow hedges, net of tax | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 0 0 (79)
Unrecognized pension and postretirement benefit costs, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year (5,035) (3,906) (3,569)
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities (net of tax effect of $(1,885), $(979)and $(355)) (5,984) (3,117) (1,117)
Reclassification to earnings (net of tax effect of $1,607, $626 and $439) 5,104 1,988 1,389
Balance at end of period (5,915) (5,035) (3,906)
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities, tax effect (1,885) (979) (355)
Reclassification to earnings, tax effect 1,607 626 439
Unrecognized pension and postretirement benefit costs, net of tax | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect $ 0 $ 0 $ (609)