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Investment in Unconsolidated Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Equity and measurement alternative method investments          
Equity method investments $ 458   $ 458   $ 435
Measurement alternative method investments 19   19   18
Total investments in unconsolidated entities 477 $ 452 477 $ 452 $ 453
Equity method investments, combined income statements          
Revenues 1,661 1,636 3,324 3,251  
Operating expenses 1,204 1,229 2,417 2,446  
Operating income 457 407 907 805  
Other income (expense), net 1 (2) (1) (2)  
Net income $ 458 $ 405 $ 906 $ 803