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Investment in Unconsolidated Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,679 | $ 1,738 | $ 5,008 | $ 5,199
Operating expenses | 1,254 | 1,267 | 3,662 | 3,840
Operating income | 425 | 471 | 1,346 | 1,359
Other income (expense), net | (2) | (11) | (10) | (17)
Net income | $ 423 | $ 460 | $ 1,336 | $ 1,342

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