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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 1,723 $ 432 $ 4,007 $ 7
Defined benefit plans:        
Actuarial losses arising during the period 0 (89) (1) (89)
Amortization of unrecognized amounts included in net periodic benefit costs 4 14 12 38
Foreign exchange losses 0 (1) (1) (2)
Other comprehensive income (loss) 4 (76) 10 (53)
Total comprehensive income (loss) 1,727 356 4,017 (46)
Total comprehensive income attributable to noncontrolling interests (324) (103) (806) (115)
Total comprehensive income (loss) $ 1,403 $ 253 $ 3,211 $ (161)