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Investment in Unconsolidated Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,636 | $ 1,641 | $ 3,251 | $ 3,329
Operating expenses | 1,229 | 1,173 | 2,446 | 2,408
Operating income | 407 | 468 | 805 | 921
Other expense, net | (2) | (3) | (2) | (8)
Net income | $ 405 | $ 465 | $ 803 | $ 913

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