Fair Value Measurements, Recurring (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Assets
Investments in AFS debt securities		$ 0
Cash and Cash Equivalents [Member]
Assets
Investments in AFS debt securities	$ 125,000,000
Prepaid Expenses and Other [Member]
Assets
Investments in AFS debt securities	96,000,000
Fair Value, Recurring [Member]
Assets
Investments in AFS debt securities	221,000,000
Total gross fair value, assets	1,133,000,000	616,000,000
Effect of counterparty netting	(705,000,000)	(444,000,000)
Effect of cash collateral netting	(8,000,000)	(15,000,000)
Net carrying value on balance sheet, assets	420,000,000	157,000,000
Liabilities
Blending program obligations	55,000,000	57,000,000
Total gross fair value, liabilities	766,000,000	544,000,000
Effect of counterparty netting	(705,000,000)	(444,000,000)
Effect of cash collateral netting	0	(28,000,000)
Net carrying value on Balance Sheet, liabilities	61,000,000	72,000,000
Fair Value, Recurring [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	78,000,000	89,000,000
Fair Value, Recurring [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	830,000,000	522,000,000
Effect of counterparty netting	(705,000,000)	(444,000,000)
Effect of cash collateral netting	(8,000,000)	(15,000,000)
Derivative contracts, net assets	117,000,000	63,000,000
Cash collateral received not offset	0	0
Liabilities
Derivative contracts	705,000,000	472,000,000
Effect of counterparty netting	(705,000,000)	(444,000,000)
Effect of cash collateral netting	0	(28,000,000)
Derivative contracts, net liabilities	0	0
Cash collateral paid not offset	(149,000,000)	(41,000,000)
Fair Value, Recurring [Member] | Physical Purchase Contracts [Member]
Assets
Derivative contracts, not subject to netting	4,000,000	4,000,000
Liabilities
Derivative contracts, not subject to netting	4,000,000	5,000,000
Fair Value, Recurring [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting		1,000,000
Liabilities
Derivative contracts, not subject to netting	2,000,000	10,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Investments in AFS debt securities	56,000,000
Total gross fair value, assets	958,000,000	606,000,000
Liabilities
Blending program obligations	0	0
Total gross fair value, liabilities	707,000,000	482,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	72,000,000	83,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	830,000,000	522,000,000
Liabilities
Derivative contracts	705,000,000	472,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, 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
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting		1,000,000
Liabilities
Derivative contracts, not subject to netting	2,000,000	10,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Investments in AFS debt securities	165,000,000
Total gross fair value, assets	169,000,000	4,000,000
Liabilities
Blending program obligations	55,000,000	57,000,000
Total gross fair value, liabilities	59,000,000	62,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	0	0
Liabilities
Derivative contracts	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member]
Assets
Derivative contracts, not subject to netting	4,000,000	4,000,000
Liabilities
Derivative contracts, not subject to netting	4,000,000	5,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting		0
Liabilities
Derivative contracts, not subject to netting	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Investments in AFS debt securities	0
Total gross fair value, assets	6,000,000	6,000,000
Liabilities
Blending program obligations	0	0
Total gross fair value, liabilities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	6,000,000	6,000,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	0	0
Liabilities
Derivative contracts	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, 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
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting		0
Liabilities
Derivative contracts, not subject to netting	$ 0	$ 0