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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Total gross fair value, assets	$ 498	$ 718
Effect of counterparty netting	(373)	(612)
Effect of cash collateral netting	(18)	0
Net carrying value on Balance Sheet, assets	107	106
Liabilities
Environmental credit obligations	96	2
Total gross fair value, liabilities	505	683
Effect of counterparty netting	(373)	(612)
Effect of cash collateral netting	(32)	(56)
Net carrying value on Balance Sheet, liabilities	100	15
Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	82	74
Commodity Contracts [Member]
Assets
Derivative contracts	403	617
Effect of counterparty netting	(373)	(612)
Effect of cash collateral netting	(18)	0
Derivative contracts, net assets	12	5
Cash collateral received not offset	0	0
Liabilities
Derivative contracts	405	668
Effect of counterparty netting	(373)	(612)
Effect of cash collateral netting	(32)	(56)
Derivative contracts, net liabilities	0	0
Cash collateral paid not offset	(44)	(84)
Physical Purchase Contracts [Member]
Assets
Derivative contracts	13
Derivative contracts, net assets	13
Liabilities
Derivative contracts		3
Derivative contracts, net liabilities		3
Foreign Currency Contracts [Member]
Assets
Derivative contracts		27
Derivative contracts, net assets		27
Liabilities
Derivative contracts	4	10
Derivative contracts, net liabilities	4	10
Fair Value, Inputs, Level 1 [Member]
Assets
Total gross fair value, assets	477	709
Liabilities
Environmental credit obligations	0	0
Total gross fair value, liabilities	409	678
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member]
Assets
Investments of certain benefit plans	74	65
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member]
Assets
Derivative contracts	403	617
Liabilities
Derivative contracts	405	668
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member]
Assets
Derivative contracts	0
Liabilities
Derivative contracts		0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts		27
Liabilities
Derivative contracts	4	10
Fair Value, Inputs, Level 2 [Member]
Assets
Total gross fair value, assets	13	0
Liabilities
Environmental credit obligations	96	2
Total gross fair value, liabilities	96	5
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	13
Liabilities
Derivative contracts		3
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts		0
Liabilities
Derivative contracts	0	0
Fair Value, Inputs, Level 3 [Member]
Assets
Total gross fair value, assets	8	9
Liabilities
Environmental credit 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	8	9
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
Liabilities
Derivative contracts		0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member]
Assets
Derivative contracts		0
Liabilities
Derivative contracts	$ 0	$ 0

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