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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 65,590 $ 68,189
Other comprehensive income (loss), net of tax 134 (259)
Balance at end of period 66,427 70,426
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (3,630) (2,457)
Other comprehensive income (loss), net of tax 148 (293)
Balance at end of period (3,482) (2,750)
Defined Benefit Plans    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (7,669) (7,665)
Other comprehensive income (loss), net of tax (37) 76
Other comprehensive income (loss) before reclassification adjustment, net of tax (59) 51
Reclassification adjustment, net of tax 22 25
Balance at end of period $ (7,706) $ (7,589)