Supplementary Cash Flow Information (Detail) - USD ($) $ in Millions		12 Months Ended
Jul. 02, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities
Interest paid		$ (331)	$ (326)	$ (408)
Income taxes paid, net of refunds		(140)	(455)	(1,353)
Cash Flows From Investing Activities
Capital expenditures incurred - E&P		(3,753)	(4,920)	(5,174)
(Increase) decrease in related liabilities – E&P		(203)	53	(239)
Additions to property, plant and equipment - E&P		(3,956)	(4,867)	(5,413)
Capital expenditures incurred - Bakken Midstream		(296)	(301)	(535)
(Increase) decrease in related liabilities – Bakken Midstream		(69)	(46)	11
Additions to property, plant and equipment - Bakken Midstream		(365)	(347)	(524)
Cash Flows From Financing Activities
Contribution from formation of Bakken Midstream joint venture	$ 2,628	2,628	0	0
Distributions to partner in Bakken Midstream joint venture		(332)	0	0
Noncontrolling interests, net related to Continuing operations		2,296	0	(182)
Significant Non-Cash Transactions
Increase in debt due to construction of a floating production system - Tubular Bells Field		0	68	116
Bakken Midstream
Cash Flows From Financing Activities
Noncontrolling interests, net related to Continuing operations		$ 2,296	$ 0	$ 0

Increase decrease in capital expenditures.

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Increase decrease in related liabilities for oil and gas property and equipment.

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Increase decrease in related liabilities for other property and equipment.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The amount of cash paid for interest during the period.

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The fair value of liabilities assumed in noncash investing or financing activities.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Amount of increase (decrease) of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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