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Revenue - Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Allowance for doubtful accounts	$ (1)	$ (30)
Total accounts receivable, net	815	746
Oil, natural gas and NGL sales
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	670	589
Joint interest
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	105	119
Other
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	$ 41	$ 68

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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