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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Document Period End Date | Dec. 31, 2021 |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 2,105 | $ 1,910 | $ 1,857
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | (29) | (6) | 2
Deferred Revenue, Revenue Recognized | 2 | 28 | 22
Regulated Operating Revenue | 2,078 | 1,932 | 1,881
Unregulated Operating Revenue | 255 | 162 | 170
Regulated and Unregulated Operating Revenue | 63 | 51 | 72
Total Revenues | 2,396 | 2,145 | 2,123
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  | 24 | 23
Gain on Derivative Instruments, Pretax | 63 | 65 | 50
Asset Retirement Obligation, Cash Paid to Settle | 18 | 18 | 9
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 1,118 | 1,030 | 981
Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 690 | 616 | 636
Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 250 | 218 | 196
Direct Access customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 47 | $ 46 | $ 44

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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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