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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period $ 73,961 $ 71,927 $ 66,774 $ 65,815 $ 71,927 $ 65,815
Other comprehensive income (loss), net of tax (174) 113 (74) 442 (61) 368
Balance at end of period 75,685 73,961 68,260 66,774 75,685 68,260
Foreign currency translation adjustments            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (2,611) (2,776) (2,256) (2,653) (2,776) (2,653)
Other comprehensive income (loss), net of tax (82)   (301)   83 96
Balance at end of period (2,693) (2,611) (2,557) (2,256) (2,693) (2,557)
Defined benefit plans            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (4,886) (4,851) (6,425) (6,528) (4,851) (6,528)
Other comprehensive income (loss), net of tax (44)   275   (78) 378
Other comprehensive income (loss) before reclassification adjustment, net of tax (45)   226   (84) 278
Reclassification adjustment, net of tax 2   49   6 100
Balance at end of period $ (4,930) $ (4,886) $ (6,150) $ (6,425) $ (4,930) $ (6,150)