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Investment in Unconsolidated Entities - Schedule of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]          
Equity method investments $ 469   $ 469   $ 459
Measurement alternative method investments 21   21   21
Total investments in unconsolidated entities 490 $ 477 490 $ 477 $ 480
Equity method investments, combined income statements          
Revenues 1,660 1,661 3,356 3,324  
Operating expenses 1,192 1,204 2,413 2,417  
Operating income 468 457 943 907  
Other income (expense), net 3 1 (3) (1)  
Net income $ 471 $ 458 $ 940 $ 906