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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period $ 70,426 $ 68,189 $ 73,961 $ 71,927 $ 68,189 $ 71,927
Other comprehensive income (loss), net of tax (353) (259) (174) 113 (612) (61)
Balance at ending of period 71,900 70,426 75,685 73,961 71,900 75,685
Foreign Currency Translation Adjustments            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (2,750) (2,457) (2,611) (2,776) (2,457) (2,776)
Other comprehensive income (loss), net of tax (405)   (82)   (698) 83
Balance at ending of period (3,155) (2,750) (2,693) (2,611) (3,155) (2,693)
Defined Benefit Plans            
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]            
Balance at beginning of period (7,589) (7,665) (4,886) (4,851) (7,665) (4,851)
Other comprehensive income (loss), net of tax 45   (44)   121 (78)
Other comprehensive income (loss) before reclassification adjustment, net of tax 22   (45)   73 (84)
Reclassification adjustment, net of tax 24   2   49 6
Balance at ending of period $ (7,544) $ (7,589) $ (4,930) $ (4,886) $ (7,544) $ (4,930)