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Investments in Unconsolidated Entities - Schedule of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]      
Equity method investments $ 447   $ 428
Measurement alternative method investments 8   7
Total investments in unconsolidated entities 455   $ 435
Schedule of Equity Method Investments [Line Items]      
Revenues 1,023 $ 963  
Operating expenses 939 913  
Operating income 84 50  
Other income (expense), net 0 1  
Net income 62 72  
Equity method investments      
Schedule of Equity Method Investments [Line Items]      
Revenues 1,727 1,657  
Operating expenses 1,275 1,162  
Operating income 452 495  
Other income (expense), net 12 3  
Net income $ 464 $ 498