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Organization and Basis of Presentation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | $ 40 | $ 1,014
Regulatory Liability | (2,720) | (157)
Net Regulatory Assets (Liabilities) included on the Consolidated Balance Sheets | (2,680) | 857
Increase (Decrease) | (3,537) |
Regulatory transition costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 46 | 90
Increase (Decrease) | (44) |
Customer receivables (payables) for future income taxes |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | (2,765) | 468
Increase (Decrease) | (3,233) |
Nuclear decommissioning and spent fuel disposal costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | (323) | (304)
Increase (Decrease) | (19) |
Asset removal costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | (774) | (770)
Increase (Decrease) | (4) |
Deferred transmission costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 187 | 122
Increase (Decrease) | 65 |
Deferred generation costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 198 | 331
Increase (Decrease) | (133) |
Deferred distribution costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 258 | 296
Increase (Decrease) | (38) |
Contract valuations |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 118 | 153
Increase (Decrease) | (35) |
Storm-related costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 329 | 397
Increase (Decrease) | (68) |
Other |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 46 | $ 74
Increase (Decrease) | $ (28) |

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- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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