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Financial Instruments - Narrative (Details) bbl in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) bbl | Mar. 31, 2020 USD ($) | [1] | Dec. 31, 2020 USD ($) bbl
Derivative [Line Items] |  |  |  |
Derivative contracts, at fair value | $ 855 |  | $ 785 |
Investment Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value derivative instruments with credit risk related contingent features in a liability position | $ 2 |  | $ 1 |
Not designated as hedging instrument | Commodity contracts not considered probable of settlement | Energy Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Volume of derivatives (barrels) | bbl | 4 |  | 6 |
Not designated as hedging instrument | RINs contracts | Energy Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Number of derivatives | bbl | 32 |  | 13 |
Not designated as hedging instrument | Credit Default Swap | Energy Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Number of derivatives | 12 |  | 7 |
Cost of goods sold | Not designated as hedging instrument | Energy Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | $ (32) | $ 46 |  |
Other assets. | Not designated as hedging instrument | Investment Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative contracts, at fair value | 849 |  | $ 785 | [2]
Other assets. | Not designated as hedging instrument | Energy Segment |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative contracts, at fair value | $ 6 |  | $ 63 |
[1] | Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment.
[2] | Excludes netting of cash collateral received and posted. The total collateral posted at March 31, 2021 and December 31, 2020 was $936 million and $872 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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