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Financial Instruments - Narrative (Details) bbl in Millions, MMBbls in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($) bbl MMBbls	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item bbl MMBbls
Derivatives, Fair Value [Line Items]
Unrealized Gain On Derivative Contracts		$ 469,000,000		$ 612,000,000
Investment Segment
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments with credit risk related contingent features in a liability position		1,000,000		0
Investment Segment | Not designated as hedging instrument | Other assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized Gain On Derivative Contracts	[1]	456,000,000		611,000,000
Energy Segment | Not designated as hedging instrument | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset		13,000,000		1,000,000
Unrealized Gain On Derivative Contracts		0		$ 2,000,000
Energy Segment | Not designated as hedging instrument | Cost of Goods and Service Benchmark [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on derivatives not designated as hedging instruments recognized in income		$ 2,000,000	$ (32,000,000)
Maximum
Derivatives, Fair Value [Line Items]
Derivative volume (barrels) | MMBbls		1
Forward Contracts [Member] | Energy Segment | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held | bbl		1		2
Credit Default Swap [Member] | Energy Segment | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held		1		0
Forward Purchase Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative volume (barrels) | MMBbls		1		1
Forward Sale Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative volume (barrels) | MMBbls		1		1
[1] Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2022 and December 31, 2021 was $1,615 million and $1,906 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the condensed consolidated balance sheets.

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