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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, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period $ 66,774 $ 65,815 $ 54,443 $ 49,677 $ 65,815 $ 49,677
Other comprehensive income (loss), net of tax (74) 442 330 155 368 485
Balance at end of period 68,260 66,774 57,876 54,443 68,260 57,876
Foreign currency translation adjustments            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (2,256) (2,653) (2,759) (2,735) (2,653) (2,735)
Other comprehensive income (loss), net of tax (301)   314   96 290
Balance at end of period (2,557) (2,256) (2,445) (2,759) (2,557) (2,445)
Defined benefit plans            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (6,425) (6,528) (10,494) (10,654) (6,528) (10,654)
Other comprehensive income (loss) before reclassification adjustment, net of tax 226   (48)   278 38
Reclassification adjustment, net of tax 49   76   100 150
Other comprehensive income (loss), net of tax 275   28   378 188
Balance at end of period $ (6,150) $ (6,425) $ (10,466) $ (10,494) $ (6,150) $ (10,466)