Supplementary Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Interest paid	$ (460)	$ (380)	$ (394)
Net income taxes (paid) refunded	(64)	(417)	(463)
Cash Flows From Investing Activities
Additions to property, plant and equipment - E&P	(1,896)	(2,433)	(1,854)
Additions to property, plant and equipment - Midstream	(301)	(396)	(243)
Exploration and Production
Cash Flows From Investing Activities
Capital expenditures incurred	(1,678)	(2,576)	(1,909)
Increase (decrease) in related liabilities	(218)	143	55
Additions to property, plant and equipment - E&P	(1,896)	(2,433)	(1,854)
Midstream
Cash Flows From Investing Activities
Capital expenditures incurred	(253)	(416)	(271)
Increase (decrease) in related liabilities	(48)	20	28
Additions to property, plant and equipment - Midstream	$ (301)	$ (396)	$ (243)

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

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586

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- References

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- Definition

The cash outflow for acquisition of machinery and equipment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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- Definition

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.

+ References

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- Definition

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.

+ References

No definition available.

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