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

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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