Other Liabilities - Current Table (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Other Current Liabilities [Line Items]
Current revenues and royalties due others	$ 612	$ 543
Accrued drilling and production costs	216	169
Joint interest prepayments received	74	71
Accrued compensation and benefits	214	239
Other accrued taxes	43	32
Bank of New York Mellon legal accrual(a)	0	440
Other	296	304
Current liabilities	$ 1,455	$ 1,798
Senior Notes [Member] \| 6.775 Senior Notes due 2019 [Member]
Other Current Liabilities [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.775%
Redemption of 2019 Notes [Member] \| Senior Notes [Member] \| 6.775 Senior Notes due 2019 [Member]
Other Current Liabilities [Line Items]
Payments for Legal Settlements	$ 441

[Line Items] for Other Current Liabilities [Table]

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The current portion of prepayments received from customers for goods or services to be provided in the future.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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