Unconsolidated Investments - Summarized Operating Results of Unconsolidated Investees (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Equity Method Investments and Joint Ventures [Abstract] | ||||
| Revenue | $ 47 | $ 65 | $ 208 | $ 245 |
| Cost of revenue | 30 | 29 | 98 | 89 |
| Operating expenses | 37 | 20 | 117 | 74 |
| Other expense | 23 | 18 | 73 | 58 |
| Net income (loss) | $ (43) | $ (2) | $ (80) | $ 24 |