Revenue Recognition - Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Allowance for doubtful accounts	$ (17)	$ (30)
Accounts receivable, net	1,247	1,322
Oil, Natural Gas and NGL Sales [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	976	959
Joint interest billings [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	211	209
Other [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable, gross	$ 77	$ 184

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-Subparagraph (a)
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- Definition

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.

+ References

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- Definition

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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