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Investment 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 | $ 1,596 | $ 1,679 | $ 4,848 | $ 5,008
Operating expenses | 1,184 | 1,254 | 3,631 | 3,662
Operating income | 412 | 425 | 1,217 | 1,346
Other expense, net | (2) | (2) | (4) | (10)
Net income | $ 410 | $ 423 | $ 1,213 | $ 1,336

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