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Acquisitions and Dispositions - Narrative (Details) a in Thousands	1 Months Ended					3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Dec. 31, 2021 USD ($) a	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Assets Acquisition in the Lower 48 Segment
Business Acquisition [Line Items]
Total asset consideration	$ 236,000,000
Asset acquisition, property plant and equipment	254,000,000
ARO incurred in assets acquisition	10,000,000
Asset acquisition, reduction in working capital	8,000,000
Subsidiaries Holding Indonesia Assets and Operations
Business Acquisition [Line Items]
Earnings before income tax								$ 138,000,000	$ 423,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Canada and Lower 48
Business Acquisition [Line Items]
Contingent payment						$ 6,000,000	$ 121,000,000	430,000,000	$ 222,000,000
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 sold, property, plant and equipment			300,000,000
Asset sold, cash and cash equivalents			200,000,000
Asset sold, 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						76,000,000
After-tax gain (loss) on disposition		63,000,000						(58,000,000)
Net carry value of asset disposed	286,000,000	290,000,000				286,000,000		286,000,000
Assets sold	310,000,000					310,000,000		310,000,000
Assets sold, property, plant and equipment	303,000,000	401,000,000				303,000,000		303,000,000
Assets sold, liabilities	24,000,000	$ 111,000,000				24,000,000		24,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Noncore Assets
Business Acquisition [Line Items]
Disposal group, consideration	$ 210,000,000					$ 210,000,000		$ 210,000,000
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%		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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