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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 49,677 $ 45,957 $ 42,777
Other comprehensive income (loss), net of tax 4,206 (2,318) (2,128)
Balance at end of period 65,815 49,677 45,957
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (2,735) (2,278) (2,250)
Other comprehensive income (loss), net of tax 81 (457) (28)
Balance at end of period (2,654) (2,735) (2,278)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (10,654) (8,859) (6,737)
Other comprehensive income (loss) and noncontrolling interests before reclassification adjustment 4,714 (2,661) (2,769)
Tax benefit (expense) (906) 444 463
Other comprehensive income (loss) and noncontrolling interests before reclassification adjustment, net of tax 3,808 (2,217) (2,306)
Reclassification adjustment, net of tax 318 422 184
Other comprehensive income (loss), net of tax 4,126 (1,795) (2,122)
Balance at end of period $ (6,528) $ (10,654) $ (8,859)