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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 68,189 $ 71,927
Other comprehensive income (loss), net of tax (259) 113
Balance at ending of period 70,426 73,961
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (2,457) (2,776)
Other comprehensive income (loss), net of tax (293) 164
Balance at ending of period (2,750) (2,611)
Defined Benefit Plans    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (7,665) (4,851)
Other comprehensive income (loss), net of tax 76 (35)
Other comprehensive income (loss) before reclassification adjustment, net of tax 51 (39)
Reclassification adjustment, net of tax 25 4
Balance at ending of period $ (7,589) $ (4,886)