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Investments Narrative (Details) - FTS International, Inc. [Member] - USD ($) shares in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |
Investment, ownership percentage | 20.00% | 29.00%
Investment, realized gain (loss) | $ 61 |
Number of shares sold | 4.3 |
Proceeds from sale of equity method investments | $ 74 |
Shares held (in shares) | 22.0 |
IPO [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment, ownership percentage | 24.00% |
Investment, realized gain (loss) | $ 78 |

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