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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 68,189 $ 71,927 $ 65,815
Other comprehensive income (loss), net of tax (1,137) (2,355) 1,337
Balance at end of period 65,590 68,189 71,927
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (2,457) (2,776) (2,654)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of tax (1,173) 319 (123)
Balance at end of period (3,630) (2,457) (2,776)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (7,665) (4,851) (6,528)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of tax (298) (2,868) 1,488
Other comprehensive loss and noncontrolling interests before reclassification adjustment (207) (3,706) 1,487
Tax benefit (expense) (91) 838 2
Reclassification adjustment, net of tax 294 54 188
Other comprehensive income (loss), net of tax (4) (2,814) 1,677
Balance at end of period $ (7,669) $ (7,665) $ (4,851)