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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year $ (4,994) $ (4,867)  
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 48 (149) $ 86
Current period changes in fair value (net of tax effect of $4, $(1) and $(1)) 6 0 (1)
Current period changes in fair value (net of tax effect of $61, $135 and $(190)) 72 485 (321)
Balance at end of period (5,997) (4,994) (4,867)
Foreign currency translation gain (loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year (1,126) (930) (1,016)
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 (48) 149 (86)
Cumulative Effect of New Accounting Principle in Period of Adoption 0 (47) 0
Balance at end of period (1,078) (1,126) (930)
Unrealized gain (loss) on marketable securities, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year (2) (2) (1)
Current period changes in fair value (net of tax effect of $4, $(1) and $(1)) 11 (3) (2)
Reclassification to earnings (net of tax effect of $(1), $1 and $1) (5) 3 1
Balance at end of period 4 (2) (2)
Unrealized gain (loss) on cash flow hedges, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year 40 (366) (45)
Current period changes in fair value (net of tax effect of $61, $135 and $(190)) 195 429 (316)
Reclassification to earnings (net of tax effect of $(39), $18 and $(3)) (123) 56 (5)
Cumulative Effect of New Accounting Principle in Period of Adoption 0 (79) 0
Balance at end of period 112 40 (366)
Unrecognized pension and postretirement benefit costs, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year (3,906) (3,569) (3,421)
Reclassification to earnings (net of tax effect of $626, $439 and $269) 1,988 1,389 731
Cumulative Effect of New Accounting Principle in Period of Adoption 0 (609) 0
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities (net of tax effect of $(979), $(355) and $(180)) (3,117) (1,117) (879)
Balance at end of period (5,035) (3,906) (3,569)
Net Income [Member] [Member] | Unrealized gain (loss) on marketable securities, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification to earnings (net of tax effect of $(1), $1 and $1) 5 (3) (1)
Net Income [Member] [Member] | Unrealized gain (loss) on cash flow hedges, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification to earnings (net of tax effect of $(39), $18 and $(3)) (123) 56 (5)
Net Income [Member] [Member] | Unrecognized pension and postretirement benefit costs, net of tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification to earnings (net of tax effect of $626, $439 and $269) $ (1,988) $ (1,389) $ (731)