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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 49,677 $ 45,957
Other comprehensive income (loss), net of tax 155 (656)
Balance at end of period 54,443 44,317
Foreign currency translation adjustments    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (2,735) (2,277)
Other comprehensive income (loss), net of tax (24) (814)
Balance at end of period (2,759) (3,091)
Defined benefit plans    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (10,654) (8,857)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards 86 263
Reclassification adjustment, net of tax 74 54
Other comprehensive income (loss), net of tax 160 317
Balance at end of period $ (10,494) $ (8,540)