Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Total gross fair value, assets	$ 1,188	$ 616
Effect of counterparty netting	(922)	(444)
Effect of cash collateral netting	(12)	(15)
Net carrying value on Balance Sheet, assets	254	157
Liabilities
Blending program obligations	42	57
Total gross fair value, liabilities	992	544
Effect of counterparty netting	(922)	(444)
Effect of cash collateral netting	(22)	(28)
Net carrying value on Balance Sheet, liabilities	48	72
Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	76	89
Commodity Contracts [Member]
Assets
Derivative contracts	1,083	522
Effect of counterparty netting	(922)	(444)
Effect of cash collateral netting	(12)	(15)
Derivative contracts, net assets	149	63
Cash collateral received not offset	0	0
Liabilities
Derivative contracts	944	472
Effect of counterparty netting	(922)	(444)
Effect of cash collateral netting	(22)	(28)
Derivative contracts, net liabilities	0	0
Cash collateral paid not offset	(65)	(41)
Physical Purchase Contracts [Member]
Assets
Derivative contracts, not subject to netting	11	4
Liabilities
Derivative contracts, not subject to netting	6	5
Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting	18	1
Liabilities
Derivative contracts, not subject to netting		10
Fair Value, Inputs, Level 1 [Member]
Assets
Total gross fair value, assets	1,171	606
Liabilities
Blending program obligations	0	0
Total gross fair value, liabilities	944	482
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	70	83
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	1,083	522
Liabilities
Derivative contracts	944	472
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, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting	18	1
Liabilities
Derivative contracts, not subject to netting		10
Fair Value, Inputs, Level 2 [Member]
Assets
Total gross fair value, assets	11	4
Liabilities
Blending program obligations	42	57
Total gross fair value, liabilities	48	62
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 contracts, not subject to netting	11	4
Liabilities
Derivative contracts, not subject to netting	6	5
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting	0	0
Liabilities
Derivative contracts, not subject to netting		0
Fair Value, Inputs, Level 3 [Member]
Assets
Total gross fair value, assets	6	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	6	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 contracts, not subject to netting	0	0
Liabilities
Derivative contracts, not subject to netting	0	0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting	$ 0	0
Liabilities
Derivative contracts, not subject to netting		$ 0