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Contingencies and Commitments - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Chaparral Energy, Inc. [Member] | Healthcare of Ontario Pension Plan (HOOPP) [Member] | Pending litigation [Member] |
Loss Contingencies [Line Items] |
Loss contingency, damages sought, value | $ 215

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