Leased area representing summation of fractional ownership working interest to whole on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (b)

Asset Acquisitions and Dispositions - Textual (Details) - Operating Segments [Member]	1 Months Ended			6 Months Ended		12 Months Ended
	Jul. 31, 2020 USD ($) a	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jun. 30, 2020 USD ($) MBoe	Jun. 30, 2019 USD ($)	Dec. 31, 2019 MBoe	May 27, 2020 USD ($)
Lower 48 Segment
Long Lived Assets Held For Sale [Line Items]
Natural gas production \| MBoe						15
Canada Segment [Member] \| Scenario Plan [Member] \| Subsequent Event [Member] \| Montney [Member]
Long Lived Assets Held For Sale [Line Items]
Oil and Gas, Undeveloped Acreage, Net \| a	295,000
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Canada Segment [Member] \| Scenario Plan [Member] \| Subsequent Event [Member] \| Additional Montney acreage [Member]
Long Lived Assets Held For Sale [Line Items]
Payments to Acquire Businesses, Gross	$ 375,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities	$ 30,000,000
Oil and Gas, Undeveloped Acreage, Net \| a	140,000
Australia West Assets [Member] \| Asia Pacific and Middle East [Member]
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions				$ 765,000,000
Before-tax gain (loss) on disposition				(587,000,000)
Disposition, Net carrying value							$ 200,000,000
Disposition, Cash							500,000,000
Disposition, PP&E							1,300,000,000
Disposition, Other current assets							100,000,000
Asset Retirement Obligation of held for sale or sold							700,000,000
Disposition, deferred tax liabilities							300,000,000
Disposition, other liabilities							$ 200,000,000
Disposition, Before-tax earnings				$ (265,000,000)	$ (156,000,000)
Natural gas production \| MBoe				35
Segment which includes disposition				Asia Pacific and Middle East
Barossa project [Member] \| Asia Pacific and Middle East [Member] \| Scenario Plan [Member]
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions				$ 200,000,000
Waddell Ranch [Member] \| Lower 48 Segment
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions			$ 184,000,000
Before-tax gain (loss) on disposition			$ 0
Segment which includes disposition				Lower 48
Niobrara [Member] \| Lower 48 Segment
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions		$ 359,000,000
Before-tax gain (loss) on disposition		(38,000,000)
Disposition, Net carrying value		397,000,000
Disposition, PP&E		433,000,000
Asset Retirement Obligation of held for sale or sold		$ 34,000,000
Disposition, Before-tax earnings				$ 24,000,000	$ 5,000,000
Segment which includes disposition				Lower 48