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Balance Sheet Components (Tables) | 3 Months Ended
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Mar. 31, 2014
Balance Sheet Components [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | The activity in the allowance for uncollectible accounts is as follows (in millions):
| Three Months Ended March 31,
| 2014 |  | 2013
Balance as of beginning of period | $ | 6 |  |  | $ | 5 |
Provision, net | 2 |  |  | 2 |
Amounts written off, less recoveries | (1 | ) |  | (1 | )
Balance as of end of period | $ | 7 |  |  | $ | 6 |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| March 31, 2014 |  | December 31, 2013
Prepaid expenses | $ | 53 |  |  | $ | 38 |
Current deferred income tax asset | 43 |  |  | 42 |
Assets from price risk management activities | 18 |  |  | 13 |
Other | — |  |  | 1 |
Other current assets | $ | 114 |  |  | $ | 94 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| March 31, 2014 |  | December 31, 2013
Electric utility plant | $ | 7,144 |  |  | $ | 7,095 |
Construction work-in-progress | 633 |  |  | 508 |
Total cost | 7,777 |  |  | 7,603 |
Less: accumulated depreciation and amortization | (2,768 | ) |  | (2,723 | )
Electric utility plant, net | $ | 5,009 |  |  | $ | 4,880 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| March 31, 2014 |  | December 31, 2013
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 34 |  |  | $ | 123 |  |  | $ | 36 |  |  | $ | 140 |
Pension and other postretirement plans | — |  |  | 189 |  |  | — |  |  | 194 |
Deferred income taxes | — |  |  | 78 |  |  | — |  |  | 76 |
Deferred broker settlements | 8 |  |  | — |  |  | 12 |  |  | 1 |
Debt reacquisition costs | — |  |  | 16 |  |  | — |  |  | 17 |
Deferred capital projects | 11 |  |  | 19 |  |  | 16 |  |  | 18 |
Other | 2 |  |  | 23 |  |  | 2 |  |  | 18 |
Total regulatory assets | $ | 55 |  |  | $ | 448 |  |  | $ | 66 |  |  | $ | 464 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 762 |  |  | $ | — |  |  | $ | 747 |
Trojan decommissioning activities | — |  |  | 42 |  |  | — |  |  | 41 |
Asset retirement obligations | — |  |  | 39 |  |  | — |  |  | 39 |
Other | 2 |  |  | 56 |  |  | 1 |  |  | 38 |
Total regulatory liabilities | $ | 2 |  | * | $ | 899 |  |  | $ | 1 |  | * | $ | 865 |
* | Included in Accrued expenses and other current liabilities in the condensed consolidated balance sheets.
Other Liabilities Disclosure [Text Block] | Accrued expenses and other current liabilities consist of the following (in millions):
| March 31, 2014 |  | December 31, 2013
Accrued employee compensation and benefits | $ | 38 |  |  | $ | 46 |
Accrued interest payable | 36 |  |  | 23 |
Accrued taxes payable | 28 |  |  | 21 |
Accrued dividends payable | 22 |  |  | 22 |
Regulatory liabilities—current | 2 |  |  | 1 |
Other | 56 |  |  | 58 |
Total accrued expenses and other current liabilities | $ | 182 |  |  | $ | 171 |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Components of net periodic benefit cost are as follows (in millions):
| Three Months Ended March 31,
| Defined Benefit Pension Plan |  | Other Postretirement Benefits
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 4 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 9 |  |  | 8 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | — |  |  | — |
Amortization of net actuarial loss | 4 |  |  | 6 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 7 |  |  | $ | 8 |  |  | $ | 1 |  |  | $ | 2 |

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499596&loc=d3e42232-110370 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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