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Derivative Financial Instruments - Summary of Derivative Fair Value Balances (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative [Line Items]    
Mark-to-market derivative assets (current) $ 632 $ 1,179
Mark-to-market derivative assets (noncurrent) 732 995
Mark-to-market derivative liabilities (current) (502) (632)
Mark-to-market derivative liabilities (noncurrent) (341) (419)
Variation margin 606 1,712
Commodity Contract    
Derivative [Line Items]    
Mark-to-market derivative assets (current) 623 1,160
Mark-to-market derivative assets (noncurrent) 731 993
Total mark-to-market derivative assets 1,354 2,153
Mark-to-market derivative liabilities (current) (489) (627)
Mark-to-market derivative liabilities (noncurrent) (338) (418)
Total mark-to-market derivative liabilities (827) (1,045)
Total mark-to-market derivative net assets (liabilities) 527 1,108
Commodity Contract | Collateral    
Derivative [Line Items]    
Mark-to-market derivative assets (current) 228 703
Mark-to-market derivative assets (noncurrent) 193 330
Total mark-to-market derivative assets 421 1,033
Mark-to-market derivative liabilities (current) 258 922
Mark-to-market derivative liabilities (noncurrent) 212 445
Total mark-to-market derivative liabilities 470 1,367
Total mark-to-market derivative net assets (liabilities) 891 2,400
Commodity Contract | Netting    
Derivative [Line Items]    
Mark-to-market derivative assets (current) (5,120) (7,472)
Mark-to-market derivative assets (noncurrent) (3,373) (2,682)
Total mark-to-market derivative assets (8,493) (10,154)
Mark-to-market derivative liabilities (current) 5,120 7,472
Mark-to-market derivative liabilities (noncurrent) 3,373 2,682
Total mark-to-market derivative liabilities 8,493 10,154
Total mark-to-market derivative net assets (liabilities) 0 0
Commodity Contract | Not Designated as Hedging Instrument, Economic Hedge    
Derivative [Line Items]    
Mark-to-market derivative assets (current) 5,514 7,927
Mark-to-market derivative assets (noncurrent) 3,911 3,345
Total mark-to-market derivative assets 9,425 11,272
Mark-to-market derivative liabilities (current) (5,866) (9,019)
Mark-to-market derivative liabilities (noncurrent) (3,923) (3,545)
Total mark-to-market derivative liabilities (9,789) (12,564)
Total mark-to-market derivative net assets (liabilities) (364) (1,292)
Commodity Contract | Not Designated as Hedging Instrument, Propriety Trading    
Derivative [Line Items]    
Mark-to-market derivative assets (current) 1 2
Mark-to-market derivative assets (noncurrent) 0 0
Total mark-to-market derivative assets 1 2
Mark-to-market derivative liabilities (current) (1) (2)
Mark-to-market derivative liabilities (noncurrent) 0 0
Total mark-to-market derivative liabilities (1) (2)
Total mark-to-market derivative net assets (liabilities) $ 0 $ 0