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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,590 | $ 1,674 | $ 4,830 | $ 4,992
Operating expenses | 1,180 | 1,249 | 3,615 | 3,647
Operating income | 410 | 425 | 1,215 | 1,345
Other expense, net |  | (2) | (2) | (9)
Net income | $ 410 | $ 423 | $ 1,213 | $ 1,336

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