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Contingencies and Commitments - Narrative (Details) - USD ($) |  | 1 Months Ended | 8 Months Ended
--- | --- | --- | ---
Jan. 05, 2014 | Feb. 28, 2019 | Aug. 09, 2018
Loss Contingencies [Line Items] |  |  |
Settlement amount |  |  | $ 35,000,000
Chaparral Energy, Inc. | Healthcare of Ontario Pension Plan (HOOPP) | Pending litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency, damages sought, value | $ 215,000,000 |  |
FTS International, Inc. | Putative class action lawsuit | Pending litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency, damages sought, value |  | $ 1,000,000 |

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