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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
Total gross fair value, assets	$ 1,972	$ 616
Effect of counterparty netting	(1,811)	(444)
Effect of cash collateral netting	0	(15)
Net carrying value on Balance Sheet, assets	161	157
Liabilities
Blending program obligations	18	57
Total gross fair value, liabilities	2,450	544
Effect of counterparty netting	(1,811)	(444)
Effect of cash collateral netting	(612)	(28)
Net carrying value on Balance Sheet, liabilities	27	72
Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	85	89
Commodity Contracts [Member]
Assets
Derivative contracts	1,815	522
Effect of counterparty netting	(1,811)	(444)
Effect of cash collateral netting	0	(15)
Derivative contracts, net assets	4	63
Cash collateral received not offset	0	0
Liabilities
Derivative contracts	2,423	472
Effect of counterparty netting	(1,811)	(444)
Effect of cash collateral netting	(612)	(28)
Derivative contracts, net liabilities	0	0
Cash collateral paid not offset	(194)	(41)
Physical Purchase Contracts [Member]
Assets
Derivative contracts	24	4
Derivative contracts, net assets	24	4
Liabilities
Derivative contracts	2	5
Derivative contracts, net liabilities	2	5
Foreign Currency Contracts [Member]
Assets
Derivative contracts	48	1
Derivative contracts, net assets	48	1
Liabilities
Derivative contracts	7	10
Derivative contracts, net liabilities	7	10
Fair Value, Inputs, Level 1 [Member]
Assets
Total gross fair value, assets	1,942	606
Liabilities
Blending program obligations	0	0
Total gross fair value, liabilities	2,430	482
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	79	83
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	1,815	522
Liabilities
Derivative contracts	2,423	472
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member]
Assets
Derivative contracts	0	0
Liabilities
Derivative contracts	0	0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts	48	1
Liabilities
Derivative contracts	7	10
Fair Value, Inputs, Level 2 [Member]
Assets
Total gross fair value, assets	24	4
Liabilities
Blending program obligations	18	57
Total gross fair value, liabilities	20	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	24	4
Liabilities
Derivative contracts	2	5
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts	0	0
Liabilities
Derivative contracts	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	0	0
Liabilities
Derivative contracts	0	0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts	0	0
Liabilities
Derivative contracts	$ 0	$ 0

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