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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets    
Clean fuel production credits $ 157 $ 55
Investments in AFS debt securities 28 27
Total gross fair value, assets 2,472 669
Effect of counterparty netting (2,114) (448)
Effect of cash collateral netting (25) (7)
Net carrying value on balance sheet, assets 333 214
Liabilities    
Blending program obligations 87 85
Total gross fair value, liabilities 2,410 544
Effect of counterparty netting (2,114) (448)
Effect of cash collateral netting (187) (5)
Net carrying value on balance sheet, liabilities 109 91
Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 98 96
Commodity Contracts [Member]    
Assets    
Commodity derivative contracts 2,182 490
Effect of counterparty netting (2,114) (448)
Effect of cash collateral netting (25) (7)
Commodity derivative contracts, net assets 43 35
Cash collateral received not offset 0 0
Liabilities    
Commodity derivative contracts 2,301 453
Effect of counterparty netting (2,114) (448)
Effect of cash collateral netting (187) (5)
Commodity derivative contracts, net liabilities 0 0
Cash collateral paid not offset (128) (39)
Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 2 1
Liabilities    
Derivative contracts, not subject to netting 22 4
Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 5  
Liabilities    
Derivative contracts, not subject to netting   2
Level 1 [Member]    
Assets    
Clean fuel production credits 0 0
Investments in AFS debt securities 0 1
Total gross fair value, assets 2,281 583
Liabilities    
Blending program obligations 0 0
Total gross fair value, liabilities 2,301 455
Level 1 [Member] | Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 94 92
Level 1 [Member] | Commodity Contracts [Member]    
Assets    
Commodity derivative contracts 2,182 490
Liabilities    
Commodity derivative contracts 2,301 453
Level 1 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 0 0
Liabilities    
Derivative contracts, not subject to netting 0 0
Level 1 [Member] | Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 5  
Liabilities    
Derivative contracts, not subject to netting   2
Level 2 [Member]    
Assets    
Clean fuel production credits 0 0
Investments in AFS debt securities 28 26
Total gross fair value, assets 30 27
Liabilities    
Blending program obligations 87 85
Total gross fair value, liabilities 109 89
Level 2 [Member] | Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 0 0
Level 2 [Member] | Commodity Contracts [Member]    
Assets    
Commodity derivative contracts 0 0
Liabilities    
Commodity derivative contracts 0 0
Level 2 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 2 1
Liabilities    
Derivative contracts, not subject to netting 22 4
Level 2 [Member] | Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 0  
Liabilities    
Derivative contracts, not subject to netting   0
Level 3 [Member]    
Assets    
Clean fuel production credits 157 55
Investments in AFS debt securities 0 0
Total gross fair value, assets 161 59
Liabilities    
Blending program obligations 0 0
Total gross fair value, liabilities 0 0
Level 3 [Member] | Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 4 4
Level 3 [Member] | Commodity Contracts [Member]    
Assets    
Commodity derivative contracts 0 0
Liabilities    
Commodity derivative contracts 0 0
Level 3 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 0 0
Liabilities    
Derivative contracts, not subject to netting 0 0
Level 3 [Member] | Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting $ 0  
Liabilities    
Derivative contracts, not subject to netting   $ 0