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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 953	$ (549)
Defined benefit plans:
Actuarial losses arising during the period	(1)	0
Amortization of unrecognized amounts included in net periodic benefit costs	4	12
Foreign exchange losses	(1)	(5)
Other comprehensive income	2	7
Total comprehensive income (loss)	955	(542)
Total comprehensive (income) loss attributable to noncontrolling interests	(234)	59
Total comprehensive income (loss)	$ 721	$ (483)

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