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Equity Method Investments and Variable Interest Entities (Consolidated Summarized Financial Information - Statements of Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Net income	$ 26	$ (51)	$ 209
Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Revenues	1,294	2,032	2,592
Operating income	(650)	54	92
Net income	$ (698)	$ 28	$ 48

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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