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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 43,493 $ 44,317 $ 45,957 $ 47,089 $ 44,638 $ 42,777 $ 45,957 $ 42,777
Other comprehensive income (loss), net of tax (48) (97) (656) (237) 74 185 (801) 22
Balance at end of period 48,008 43,493 44,317 48,771 47,089 44,638 48,008 48,771
Foreign currency translation adjustments [Member]                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (3,192)   (2,277) (2,078)   (2,250) (2,277) (2,250)
Other comprehensive income (loss), net of tax 49     (341)     (866) (169)
Balance at end of period (3,143) (3,192)   (2,419) (2,078)   (3,143) (2,419)
Defined benefit plans [Member]                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (8,579)   $ (8,857) (6,695)   $ (6,737) (8,857) (6,737)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards (177)     80     (11) 51
Reclassification adjustment, net of tax 62     40     174 111
Other comprehensive income (loss), net of tax (115)     120     163 162
Balance at end of period $ (8,694) $ (8,579)   $ (6,575) $ (6,695)   $ (8,694) $ (6,575)