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Financial Instruments - Narrative (Details) bbl in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) bbl | Dec. 31, 2019 USD ($) bbl
Derivative [Line Items] |  |  |
Derivative contracts, at fair value (asset) | $ 1,927 | $ 182 |
Investment Segment |  |  |
Derivative [Line Items] |  |  |
Fair value derivative instruments with credit risk related contingent features in a liability position | $ 0 | $ 266 |
Not designated as hedging instrument | Commodity contracts not considered probable of settlement | Energy Segment |  |  |
Derivative [Line Items] |  |  |
Volume of derivatives (barrels) | bbl | 3 | 5 |
Not designated as hedging instrument | RINs contracts | Energy Segment |  |  |
Derivative [Line Items] |  |  |
Number of derivatives | bbl | 5 |  |
Other assets [Member] | Not designated as hedging instrument | Investment Segment |  |  |
Derivative [Line Items] |  |  |
Asset Derivatives, Gross | $ 1,935 | $ 291 |
Derivative contracts, at fair value (asset) | 1,921 | 182 | [1]
Other assets [Member] | Not designated as hedging instrument | Energy Segment |  |  |
Derivative [Line Items] |  |  |
Derivative contracts, at fair value (asset) | $ 6 | $ 8 |
[1] | Excludes netting of cash collateral received and posted. The total collateral posted at June 30, 2020 and December 31, 2019 was $349 million and $903 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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