Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Document Period End Date	Dec. 31, 2022
Regulated Operating Revenue, Electric, Non-Nuclear	$ 2,205	$ 2,105	$ 1,910
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price	11	(29)	(6)
Deferred Revenue, Revenue Recognized	7	2	28
Regulated Operating Revenue	2,223	2,078	1,932
Unregulated Operating Revenue	363	255	162
Regulated and Unregulated Operating Revenue	61	63	51
Total Revenues	2,647	2,396	2,145
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount			24
Gain on Derivative Instruments, Pretax	133	63	65
Asset Retirement Obligation, Cash Paid to Settle	27	18	18
Residential [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Electric, Non-Nuclear	1,158	1,118	1,030
Commercial [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Electric, Non-Nuclear	723	690	616
Industrial [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Electric, Non-Nuclear	289	250	218
Direct Access customers [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Electric, Non-Nuclear	$ 35	$ 47	$ 46