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Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Allowance for doubtful accounts | $ (21) | $ (17)
Total accounts receivable, net | 1,021 | 1,247
Oil, natural gas and NGL sales |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | 682 | 976
Joint interest |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | 289 | 211
Other |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable, gross | $ 71 | $ 77

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