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Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Allowance for doubtful accounts | $ (30) | $ (21)
Total accounts receivable, net | 746 | 990
Oil, natural gas and NGL sales |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | 589 | 737
Joint interest billings |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | 119 | 200
Other |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | $ 68 | $ 74

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