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Investments in Unconsolidated Entities - Schedule of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |
Equity method investments | $ 443 |  | $ 443 |  | $ 434
Measurement alternative method investments | 7 |  | 7 |  | 7
Total investments in unconsolidated entities | 450 |  | 450 |  | $ 441
Equity method investments, combined income statements |  |  |  |  |
Revenues | 1,654 | $ 1,655 | 3,343 | $ 3,312 |
Operating expenses | 1,187 | 1,199 | 2,402 | 2,407 |
Operating income | 467 | 456 | 941 | 905 |
Other income (expense), net | 4 | 2 | (2) | 1 |
Net income | $ 471 | $ 458 | $ 939 | $ 906 |

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