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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 71,900 $ 70,426 $ 68,189 $ 75,685 $ 73,961 $ 71,927 $ 68,189 $ 71,927
Other comprehensive income (loss), net of tax 365 (353) (259) 35 (174) 113 (247) (26)
Balance at end of period 74,162 71,900 70,426 78,404 75,685 73,961 74,162 78,404
Foreign Currency Translation Adjustments                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (3,155)   (2,457) (2,693)   (2,776) (2,457) (2,776)
Other comprehensive income (loss), net of tax 274     (129)     (424) (47)
Balance at end of period (2,881) (3,155)   (2,822) (2,693)   (2,881) (2,822)
Defined Benefit Plans                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (7,544)   $ (7,665) (4,930)   $ (4,851) (7,665) (4,851)
Other comprehensive income (loss), net of tax (69)     77     52 (1)
Other comprehensive income (loss) before reclassification adjustment, net of tax (97)     70     (24) (14)
Reclassification adjustment, net of tax 27     7     76 13
Balance at end of period $ (7,613) $ (7,544)   $ (4,853) $ (4,930)   $ (7,613) $ (4,853)