Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets
Total gross fair value, assets	$ 1,229	$ 616
Effect of counterparty netting	(1,131)	(444)
Effect of cash collateral netting	(4)	(15)
Net carrying value on Balance Sheet, assets	94	157
Liabilities
Blending program obligations	30	57
Total gross fair value, liabilities	1,418	544
Effect of counterparty netting	(1,131)	(444)
Effect of cash collateral netting	(207)	(28)
Net carrying value on Balance Sheet, liabilities	80	72
Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	79	89
Commodity Contracts [Member]
Assets
Derivative contracts	1,143	522
Effect of counterparty netting	(1,131)	(444)
Effect of cash collateral netting	(4)	(15)
Derivative contracts, net assets	8	63
Cash collateral received not offset	0	0
Liabilities
Derivative contracts	1,338	472
Effect of counterparty netting	(1,131)	(444)
Effect of cash collateral netting	(207)	(28)
Derivative contracts, net liabilities	0	0
Cash collateral paid not offset	(210)	(41)
Physical Purchase Contracts [Member]
Assets
Derivative contracts, not subject to netting	5	4
Liabilities
Derivative contracts, not subject to netting	26	5
Foreign Currency Contracts [Member]
Assets
Derivative contracts, not subject to netting	2	1
Liabilities
Derivative contracts, not subject to netting	24	10
Fair Value, Inputs, Level 1 [Member]
Assets
Total gross fair value, assets	1,218	606
Liabilities
Blending program obligations	0	0
Total gross fair value, liabilities	1,362	482
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	73	83
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	1,143	522
Liabilities
Derivative contracts	1,338	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	2	1
Liabilities
Derivative contracts, not subject to netting	24	10
Fair Value, Inputs, Level 2 [Member]
Assets
Total gross fair value, assets	5	4
Liabilities
Blending program obligations	30	57
Total gross fair value, liabilities	56	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	5	4
Liabilities
Derivative contracts, not subject to netting	26	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	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	$ 0