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Financial Instruments - Narrative (Details) item in Millions, bbl in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) bbl item | Dec. 31, 2020 USD ($) item bbl | Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Unrealized Gain On Derivative Contracts |  | $ 612 | $ 785 |
Investment Segment |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of derivative instruments with credit risk related contingent features in a liability position |  | 0 | 1 |
Investment Segment | Not designated as hedging instrument | Other assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Unrealized Gain On Derivative Contracts | [1] | 611 | 785 |
Energy Segment | Not designated as hedging instrument | Other assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset |  | 1 |  |
Unrealized Gain On Derivative Contracts |  | 2 | 17 |
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 |  | $ (44) | $ 55 | $ 19
Commodity contracts not considered probable of settlement | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative volume (barrels) | bbl |  | 2 | 6 |
Forward Contracts [Member] | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Number of Instruments Held | bbl |  | 3 |  |
Credit Default Swap [Member] | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Number of Instruments Held | item |  | 0 | 7 |
[1] | Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2021 and 2020 was $1,906 million and $872 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the consolidated balance sheets.

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