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Other Operating Expense - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |
Expenses recognized | $ 80
Decrease in future commitments | 169
Wildhorse resource development corporation |
Property, Plant and Equipment [Line Items] |
Business acquisition transaction costs | 37
Severance costs | $ 38

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