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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