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Investments in Unconsolidated Entities - Schedule of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]          
Equity method investments $ 465   $ 465   $ 456
Measurement alternative method investments 22   22   21
Total investments in unconsolidated entities 487 $ 486 487 $ 486 $ 477
Schedule of Equity Method Investments [Line Items]          
Revenues 1,311 1,263 2,629 2,524  
Operating expenses 1,253 1,185 2,461 2,373  
Operating income 58 78 168 151  
Other income (expense), net 0 0 (1) (1)  
Net income 34 78 105 161  
Equity Method Investments          
Schedule of Equity Method Investments [Line Items]          
Revenues 1,748 1,586 3,482 3,249  
Operating expenses 1,221 1,098 2,502 2,265  
Operating income 527 488 980 984  
Other income (expense), net (2) (2) 10 1  
Net income $ 525 $ 486 $ 990 $ 985