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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period $ 44,317 $ 45,957 $ 44,638 $ 42,777 $ 45,957 $ 42,777
Other comprehensive income (loss), net of tax (97) (656) 74 185 (753) 259
Balance at end of period 43,493 44,317 47,089 44,638 43,493 47,089
Foreign currency translation adjustments [Member]            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (3,091) (2,277) (2,125) (2,250) (2,277) (2,250)
Other comprehensive income (loss), net of tax (101)   47   (915) 172
Balance at end of period (3,192) (3,091) (2,078) (2,125) (3,192) (2,078)
Defined benefit plans [Member]            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (8,540) (8,857) (6,701) (6,737) (8,857) (6,737)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards (97)   (28)   166 (29)
Reclassification adjustment, net of tax 58   34   112 71
Other comprehensive income (loss), net of tax (39)   6   278 42
Balance at end of period $ (8,579) $ (8,540) $ (6,695) $ (6,701) $ (8,579) $ (6,695)