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Financial Instruments - Narrative (Details)
bbl in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
bbl
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
bbl
Sep. 30, 2020
USD ($)
 [1]
Dec. 31, 2020
USD ($)
bbl
Derivative [Line Items]          
Derivative Asset $ 796   $ 796   $ 785
Investment Segment          
Derivative [Line Items]          
Fair value derivative instruments with credit risk related contingent features in a liability position $ 0   $ 0   $ 1
Not designated as hedging instrument | Commodity contracts not considered probable of settlement | Energy Segment          
Derivative [Line Items]          
Volume of derivatives (barrels) | bbl     2   6
Not designated as hedging instrument | RINs contracts | Energy Segment          
Derivative [Line Items]          
Number of derivatives | bbl 17   17   13
Not designated as hedging instrument | Credit Default Swap | Energy Segment          
Derivative [Line Items]          
Number of derivatives 2   2   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 $ (12) $ 5 $ (46) $ 70  
Other assets [Member] | Not designated as hedging instrument | Investment Segment          
Derivative [Line Items]          
Derivative contracts, at fair value [2] 793   793   $ 785
Derivative Asset 1,156   1,156   1,016
Other assets [Member] | Not designated as hedging instrument | Energy Segment          
Derivative [Line Items]          
Derivative contracts, at fair value 3   3   $ 17
Derivative Asset $ 3   $ 3    
[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 September 30, 2021 and December 31, 2020 was $1,541 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.