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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 $ 437   $ 437   $ 428
Measurement alternative method investments 8   8   7
Total investments in unconsolidated entities 445   445   $ 435
Schedule of Equity Method Investments [Line Items]          
Revenues 1,014 $ 973 2,037 $ 1,937  
Operating expenses 978 920 1,917 1,833  
Operating income 36 53 120 104  
Net income 35 69 97 141  
Equity method investments          
Schedule of Equity Method Investments [Line Items]          
Revenues 1,742 1,580 3,469 3,237  
Operating expenses 1,216 1,093 2,491 2,256  
Operating income 526 487 978 981  
Other income (expense), net (2) (2) 10 2  
Net income $ 524 $ 485 $ 988 $ 983