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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.