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Financial Instruments Narrative (Details) numberOfRINs in Millions, bbl in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) numberOfRINs bbl | Dec. 31, 2018 USD ($) bbl | Dec. 31, 2017 USD ($)
Investment Segment |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative instruments with credit risk related contingent features in a liability position | $ 266 | $ 0 |
Investment Segment | Not designated as hedging instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives, Gross | 291 | 651 |
Investment Segment | Not designated as hedging instrument | Other assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative contracts, at fair value(1) | 182 | 517 |
Energy Segment | Not designated as hedging instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives, Gross | 3 | 8 |
Energy Segment | Not designated as hedging instrument | Other assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative contracts, at fair value(1) | 0 | 7 |
Energy Segment | Not designated as hedging instrument | Cost of Goods and Service Benchmark [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative gain (loss) recognized in income | $ 19 | $ 146 | $ (70)
Commodity contracts not considered probable of settlement | Energy Segment | Not designated as hedging instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative volume (barrels) | bbl | 5 | 2 |
RINs contracts [Member] | Energy Segment | Not designated as hedging instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Number of Instruments Held | numberOfRINs | 20 |  |

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