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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Regulatory Assets	$ 557	$ 592
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	322
Regulatory Liabilities	1,466	1,392
Deferred Purchased Power Costs	62	13
Removal Costs [Member]
Regulatory Assets [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
Regulatory Liabilities	1,047	1,016
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
Regulatory Liabilities	208	239
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
Regulatory Liabilities	43	37
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	56
Regulatory Liabilities	113	82
Regulatory Assets Earning a Rate of Return at the Approved Rate	57
RemainingAmountsOfRegulatoryLiabilitesForWhichNoInterstAccruesDuringRecoveryPeriodIsProvided	111
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets [Line Items]
Regulatory Assets		18
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	55
Regulatory Liabilities	0
Earning a return [Member]
Regulatory Assets [Line Items]
Regulatory Liabilities	1,355
Other Regulatory Assets Earning a Return [Member]
Regulatory Assets [Line Items]
Regulatory Assets	58
Earning a return [Member]
Regulatory Assets [Line Items]
Regulatory Assets	235
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0	124
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	55
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0	240
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	$ 131
Loss on Reacquired Debt [Member]
Regulatory Assets [Line Items]
Regulatory Current Asset, End Date for Recovery	2049
Regulatory Assets	$ 0	25
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	$ 23
Environmental Restoration Costs [Member]
Regulatory Assets [Line Items]
Regulatory Current Asset, End Date for Recovery	2059
Regulatory Assets	$ 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	90	95
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Regulatory Assets	81	83
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	23
February2021IceStormAndDamageDeferral
Regulatory Assets [Line Items]
Regulatory Assets	67	0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
PowerCostAdjustmentMechanismDeferral
Regulatory Assets [Line Items]
Regulatory Assets	29	0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
2020LaborDayWildfireDeferral
Regulatory Assets [Line Items]
Regulatory Assets	45	15
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	0
COVID-19Deferral
Regulatory Assets [Line Items]
Regulatory Assets	36	$ 10
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided	$ 0

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Costs of power used for operations in prior periods that were expected to be recovered from customers in future periods.

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