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Investments in Unconsolidated Entities - Schedule of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]          
Equity method investments $ 487   $ 487   $ 456
Measurement alternative method investments 22   22   21
Total investments in unconsolidated entities 509 $ 508 509 $ 508 $ 477
Schedule of Equity Method Investments [Line Items]          
Revenues 1,328 1,324 3,957 3,849  
Operating expenses 1,259 1,237 3,720 3,611  
Operating income 69 87 237 238  
Other income (expense), net 0 0 (1) (1)  
Net income 47 93 152 254  
Equity Method Investments          
Schedule of Equity Method Investments [Line Items]          
Revenues 1,763 1,640 5,245 4,889  
Operating expenses 1,250 1,142 3,752 3,407  
Operating income 513 498 1,493 1,482  
Other income (expense), net 5 (3) 15 (2)  
Net income $ 518 $ 495 $ 1,508 $ 1,480