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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, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period $ 54,443 $ 49,677 $ 44,317 $ 45,957 $ 49,677 $ 45,957
Other comprehensive income (loss), net of tax 330 155 (97) (656) 485 (753)
Balance at end of period 57,876 54,443 43,493 44,317 57,876 43,493
Foreign currency translation adjustments            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (2,759) (2,735) (3,091) (2,277) (2,735) (2,277)
Other comprehensive income (loss), net of tax 314   (101)   290 (915)
Balance at end of period (2,445) (2,759) (3,192) (3,091) (2,445) (3,192)
Defined benefit plans            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (10,494) (10,654) (8,540) (8,857) (10,654) (8,857)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards (48)   (97)   38 166
Reclassification adjustment, net of tax 76   58   150 112
Other comprehensive income (loss), net of tax 28   (39)   188 278
Balance at end of period $ (10,466) $ (10,494) $ (8,579) $ (8,540) $ (10,466) $ (8,579)