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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 68,260 $ 66,774 $ 65,815 $ 57,876 $ 54,443 $ 49,677 $ 65,815 $ 49,677
Other comprehensive income (loss), net of tax (454) (74) 442 (13) 330 155 (86) 472
Balance at end of period 69,540 68,260 66,774 60,321 57,876 54,443 69,540 60,321
Foreign currency translation adjustments                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (2,557)   (2,653) (2,445)   (2,735) (2,653) (2,735)
Other comprehensive income (loss), net of tax (645)     (202)     (550) 88
Balance at end of period (3,202) (2,557)   (2,647) (2,445)   (3,202) (2,647)
Defined benefit plans                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (6,150)   $ (6,528) (10,466)   $ (10,654) (6,528) (10,654)
Other comprehensive income (loss) before reclassification adjustment, net of tax 235     123     514 161
Reclassification adjustment, net of tax 47     74     146 224
Other comprehensive income (loss), net of tax 282     197     660 385
Balance at end of period $ (5,868) $ (6,150)   $ (10,269) $ (10,466)   $ (5,868) $ (10,269)