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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Equity and measurement alternative method investments |  |  |
Equity method investments | $ 444 |  | $ 411
Measurement alternative method investments | 6 |  | 4
Total investments in unconsolidated entities | 450 |  | $ 415
Equity method investments, combined income statements |  |  |
Revenues | 1,657 | $ 1,610 |
Operating expenses | 1,208 | 1,212 |
Operating income | 449 | 398 |
Other expense, net | (1) |  |
Net income | $ 448 | $ 398 |

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