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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 75,685 $ 73,961 $ 71,927 $ 68,260 $ 66,774 $ 65,815 $ 71,927 $ 65,815
Other comprehensive income (loss), net of tax 35 (174) 113 (454) (74) 442 (26) (86)
Balance at ending of period 78,404 75,685 73,961 69,540 68,260 66,774 78,404 69,540
Foreign Currency Translation Adjustments                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (2,693)   (2,776) (2,557)   (2,653) (2,776) (2,653)
Other comprehensive income (loss), net of tax (129)     (645)     (47) (550)
Balance at ending of period (2,822) (2,693)   (3,202) (2,557)   (2,822) (3,202)
Defined Benefit Plans                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (4,930)   $ (4,851) (6,150)   $ (6,528) (4,851) (6,528)
Other comprehensive income (loss), net of tax 77     282     (1) 660
Other comprehensive income (loss) before reclassification adjustment, net of tax 70     235     (14) 514
Reclassification adjustment, net of tax 7     47     13 146
Balance at ending of period $ (4,853) $ (4,930)   $ (5,868) $ (6,150)   $ (4,853) $ (5,868)