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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, 2020 USD ($) item bbl | Dec. 31, 2019 USD ($) bbl | Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Unrealized Gain On Derivative Contracts |  | $ 785 | $ 182 |
Investment Segment |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of derivative instruments with credit risk related contingent features in a liability position |  | 1 | 266 |
Investment Segment | Not designated as hedging instrument | Other assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Unrealized Gain On Derivative Contracts | [1] | 785 | 182 |
Energy Segment | Not designated as hedging instrument | Other assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Unrealized Gain On Derivative Contracts |  | 17 | 8 |
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 |  | $ 55 | $ 19 | $ 146
Commodity contracts not considered probable of settlement | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative volume (barrels) | bbl |  | 6 | 4 |
Forward Contracts [Member] | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Number of Instruments Held | bbl |  | 13 |  |
Credit Default Swap [Member] | Energy Segment | Not designated as hedging instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Number of Instruments Held | item |  | 7 |  |
[1] | Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2020 and 2019 was $872 million and $903 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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