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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Assets    
Investments in AFS debt securities $ 97 $ 111
Total gross fair value, assets 1,122 994
Effect of counterparty netting (904) (642)
Effect of cash collateral netting (5) (66)
Net carrying value on balance sheet, assets 213 286
Liabilities    
Blending program obligations 41 58
Total gross fair value, liabilities 1,018 714
Effect of counterparty netting (904) (642)
Effect of cash collateral netting (71) (1)
Net carrying value on balance sheet, liabilities 43 71
Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 86 80
Commodity Contracts [Member]    
Assets    
Derivative contracts 936 803
Effect of counterparty netting (904) (642)
Effect of cash collateral netting (5) (66)
Derivative contracts, net assets 27 95
Cash collateral received not offset 0 0
Liabilities    
Derivative contracts 975 643
Effect of counterparty netting (904) (642)
Effect of cash collateral netting (71) (1)
Derivative contracts, net liabilities 0 0
Cash collateral paid not offset (137) (67)
Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 1  
Liabilities    
Derivative contracts, not subject to netting 2 6
Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 2  
Liabilities    
Derivative contracts, not subject to netting   7
Level 1 [Member]    
Assets    
Investments in AFS debt securities 33 36
Total gross fair value, assets 1,053 915
Liabilities    
Blending program obligations 0 0
Total gross fair value, liabilities 975 650
Level 1 [Member] | Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 82 76
Level 1 [Member] | Commodity Contracts [Member]    
Assets    
Derivative contracts 936 803
Liabilities    
Derivative contracts 975 643
Level 1 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 0  
Liabilities    
Derivative contracts, not subject to netting 0 0
Level 1 [Member] | Foreign Currency Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 2  
Liabilities    
Derivative contracts, not subject to netting   7
Level 2 [Member]    
Assets    
Investments in AFS debt securities 64 75
Total gross fair value, assets 65 75
Liabilities    
Blending program obligations 41 58
Total gross fair value, liabilities 43 64
Level 2 [Member] | Assets Held in Trust [Member]    
Assets    
Investments of certain benefit plans 0 0
Level 2 [Member] | Commodity Contracts [Member]    
Assets    
Derivative contracts 0 0
Liabilities    
Derivative contracts 0 0
Level 2 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 1  
Liabilities    
Derivative contracts, not subject to netting 2 6
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    
Investments in AFS debt securities 0 0
Total gross fair value, assets 4 4
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    
Derivative contracts 0 0
Liabilities    
Derivative contracts 0 0
Level 3 [Member] | Physical Purchase Contracts [Member]    
Assets    
Derivative contracts, not subject to netting 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