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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 57,876 $ 54,443 $ 49,677 $ 43,493 $ 44,317 $ 45,957 $ 49,677 $ 45,957
Other comprehensive income (loss), net of tax (13) 330 155 (48) (97) (656) 472 (801)
Balance at end of period 60,321 57,876 54,443 48,008 43,493 44,317 60,321 48,008
Foreign currency translation adjustments                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (2,445)   (2,735) (3,192)   (2,277) (2,735) (2,277)
Other comprehensive income (loss), net of tax (202)     49     88 (866)
Balance at end of period (2,647) (2,445)   (3,143) (3,192)   (2,647) (3,143)
Defined benefit plans                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (10,466)   $ (10,654) (8,579)   $ (8,857) (10,654) (8,857)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards 123     (177)     161 (11)
Reclassification adjustment, net of tax 74     62     224 174
Other comprehensive income (loss), net of tax 197     (115)     385 163
Balance at end of period $ (10,269) $ (10,466)   $ (8,694) $ (8,579)   $ (10,269) $ (8,694)