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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 $ 458   $ 458   $ 428
Measurement alternative method investments 8   8   7
Total investments in unconsolidated entities 466   466   $ 435
Schedule of Equity Method Investments [Line Items]          
Revenues 1,016 $ 1,027 3,053 $ 2,964  
Operating expenses 971 962 2,888 2,796  
Operating income 45 65 165 168  
Net income 35 85 132 227  
Equity method investments          
Schedule of Equity Method Investments [Line Items]          
Revenues 1,756 1,634 5,225 4,871  
Operating expenses 1,244 1,136 3,735 3,392  
Operating income 512 498 1,490 1,479  
Other income (expense), net 6 (4) 15 (1)  
Net income $ 518 $ 494 $ 1,505 $ 1,478