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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 71,927 $ 65,815 $ 49,677
Other comprehensive income (loss), net of tax (2,355) 1,337 4,206
Balance at end of period 68,189 71,927 65,815
Foreign Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (2,776) (2,654) (2,735)
Other comprehensive income (loss), net of tax 319 (123) 81
Balance at end of period (2,457) (2,776) (2,654)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (4,851) (6,528) (10,654)
Other comprehensive loss and noncontrolling interests before reclassification adjustment (3,706) 1,487 4,714
Tax benefit (expense) 838 2 (906)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of tax (2,868) 1,488 3,808
Reclassification adjustment, net of tax 54 188 318
Other comprehensive income (loss), net of tax (2,814) 1,677 4,126
Balance at end of period $ (7,665) $ (4,851) $ (6,528)