Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Allowance for doubtful accounts	$ (20)	$ (17)
Total accounts receivable, net	1,196	1,247
Oil, natural gas and NGL sales
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	887	976
Joint interest
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	262	211
Other
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	$ 67	$ 77

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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