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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Investments in AFS debt securities | $ 26 | $ 111
Total gross fair value, assets | 529 | 994
Effect of counterparty netting | (402) | (642)
Effect of cash collateral netting | 0 | (66)
Net carrying value on balance sheet, assets | 127 | 286
Liabilities |  |
Blending program obligations | 13 | 58
Total gross fair value, liabilities | 464 | 714
Effect of counterparty netting | (402) | (642)
Effect of cash collateral netting | (46) | (1)
Net carrying value on balance sheet, liabilities | 16 | 71
Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 93 | 80
Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 402 | 803
Effect of counterparty netting | (402) | (642)
Effect of cash collateral netting | 0 | (66)
Derivative contracts, net assets | 0 | 95
Cash collateral received not offset | 0 | 0
Liabilities |  |
Derivative contracts | 448 | 643
Effect of counterparty netting | (402) | (642)
Effect of cash collateral netting | (46) | (1)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (71) | (67)
Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 2 |
Liabilities |  |
Derivative liabilities, not subject to netting | 3 | 6
Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 6 |
Liabilities |  |
Derivative liabilities, not subject to netting |  | 7
Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Investments in AFS debt securities | 6 | 36
Total gross fair value, assets | 503 | 915
Liabilities |  |
Blending program obligations | 0 | 0
Total gross fair value, liabilities | 448 | 650
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 89 | 76
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 402 | 803
Liabilities |  |
Derivative contracts | 448 | 643
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 0 |
Liabilities |  |
Derivative liabilities, not subject to netting | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 6 |
Liabilities |  |
Derivative liabilities, not subject to netting |  | 7
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Investments in AFS debt securities | 20 | 75
Total gross fair value, assets | 22 | 75
Liabilities |  |
Blending program obligations | 13 | 58
Total gross fair value, liabilities | 16 | 64
Fair Value, Inputs, Level 2 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 2 |
Liabilities |  |
Derivative liabilities, not subject to netting | 3 | 6
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 0 |
Liabilities |  |
Derivative liabilities, not subject to netting |  | 0
Fair Value, Inputs, 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
Fair Value, Inputs, Level 3 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 4 | 4
Fair Value, Inputs, Level 3 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | 0 |
Liabilities |  |
Derivative liabilities, not subject to netting | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting | $ 0 |
Liabilities |  |
Derivative liabilities, not subject to netting |  | $ 0

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