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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 65,815 $ 49,677
Other comprehensive income (loss), net of tax 442 155
Balance at end of period 66,774 54,443
Foreign currency translation adjustments    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (2,653) (2,735)
Other comprehensive income (loss), net of tax 397 (24)
Balance at end of period (2,256) (2,759)
Defined benefit plans    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (6,528) (10,654)
Other comprehensive income (loss) before reclassification adjustment, net of tax 52 86
Reclassification adjustment, net of tax 51 74
Other comprehensive income (loss), net of tax 103 160
Balance at end of period $ (6,425) $ (10,494)