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Acquisitions and Dispositions - Narrative (Details) a in Thousands	1 Months Ended				3 Months Ended		6 Months Ended
	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Dec. 31, 2021 USD ($) a	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)
Subsidiaries Holding Indonesia Assets and Operations
Business Acquisition [Line Items]
Earnings before income tax							$ 138,000,000	$ 264,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Canada and Lower 48
Business Acquisition [Line Items]
Contingent payment					$ 174,000,000	$ 68,000,000	$ 424,000,000	$ 94,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsidiaries Holding Indonesia Assets and Operations
Business Acquisition [Line Items]
Disposal group, consideration		$ 731,000,000
Before-tax gain (loss) on disposition		534,000,000
After-tax gain (loss) on disposition		462,000,000
Net carry value of asset disposed		200,000,000
Assets held for sale, property, plant and equipment		300,000,000
Asset held for sale, cash and cash equivalents		200,000,000
Asset held for sale, asset retirement obligation		$ 100,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets
Business Acquisition [Line Items]
Disposal group, consideration	$ 370,000,000
Before-tax gain (loss) on disposition	80,000,000
After-tax gain (loss) on disposition	63,000,000
Net carry value of asset disposed	290,000,000
Assets held for sale, property, plant and equipment	401,000,000
Assets held for sale, liabilities	$ 111,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Noncore Assets | Forecast | Subsequent Event
Business Acquisition [Line Items]
Disposal group, consideration									$ 265,000,000
APLNG
Business Acquisition [Line Items]
Additional ownership percentage in equity investment acquired			10.00%
Payments to acquire equity method investments			$ 1,400,000,000
Equity method investment, ownership percentage			47.50%		47.50%		47.50%
APLNG | Origin Energy
Business Acquisition [Line Items]
Ownership percentage			27.50%
APLNG | Sinopec
Business Acquisition [Line Items]
Ownership percentage			25.00%
Indonesia Corridor Block Production Sharing Contract | Subsidiaries Holding Indonesia Assets and Operations
Business Acquisition [Line Items]
Ownership percentage		54.00%
Transasia Pipeline Company | Subsidiaries Holding Indonesia Assets and Operations
Business Acquisition [Line Items]
Ownership percentage		35.00%
Shell Enterprises LLC
Business Acquisition [Line Items]
Total asset consideration				$ 8,600,000,000
Area of land | a				225
Capitalized costs, proved properties				$ 4,200,000,000
Capitalized costs, unproved properties				$ 4,300,000,000

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