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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 1,823 |  |
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | 3 | $ 0 | $ 0
Deferred Revenue, Revenue Recognized | (45) |  |
Regulated Operating Revenue | 1,781 |  |
Unregulated Operating Revenue | 159 |  |
Regulated and Unregulated Operating Revenue | 51 |  |
Total Revenues | 1,991 | $ 2,009 | $ 1,923
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 948 |  |
Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 647 |  |
Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 185 |  |
Direct Access customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 43 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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