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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Investments in AFS debt securities | $ 111 | $ 221
Total gross fair value, assets | 994 | 1,133
Effect of counterparty netting | (642) | (705)
Effect of cash collateral netting | (66) | (8)
Net carrying value on balance sheet, assets | 286 | 420
Liabilities |  |
Blending program obligations | 58 | 55
Total gross fair value, liabilities | 714 | 766
Effect of counterparty netting | (642) | (705)
Effect of cash collateral netting | (1) | 0
Net carrying value on balance sheet, liabilities | 71 | 61
Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 80 | 78
Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 803 | 830
Effect of counterparty netting | (642) | (705)
Effect of cash collateral netting | (66) | (8)
Derivative contracts, net assets | 95 | 117
Cash collateral received not offset | 0 | 0
Liabilities |  |
Derivative contracts | 643 | 705
Effect of counterparty netting | (642) | (705)
Effect of cash collateral netting | (1) | 0
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (67) | (149)
Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative assets, not subject to netting |  | 4
Liabilities |  |
Derivative liabilities, not subject to netting | 6 | 4
Foreign Currency Contracts [Member] |  |
Liabilities |  |
Derivative liabilities, not subject to netting | 7 | 2
Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Investments in AFS debt securities | 36 | 56
Total gross fair value, assets | 915 | 958
Liabilities |  |
Blending program obligations | 0 | 0
Total gross fair value, liabilities | 650 | 707
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 76 | 72
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 803 | 830
Liabilities |  |
Derivative contracts | 643 | 705
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] |  |
Liabilities |  |
Derivative liabilities, not subject to netting | 7 | 2
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Investments in AFS debt securities | 75 | 165
Total gross fair value, assets | 75 | 169
Liabilities |  |
Blending program obligations | 58 | 55
Total gross fair value, liabilities | 64 | 59
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 |  | 4
Liabilities |  |
Derivative liabilities, not subject to netting | 6 | 4
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Liabilities |  |
Derivative liabilities, not subject to netting | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Investments in AFS debt securities | 0 | 0
Total gross fair value, assets | 4 | 6
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 | 6
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] |  |
Liabilities |  |
Derivative liabilities, not subject to netting | $ 0 | $ 0

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