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Balance Sheet Components (Tables) | 3 Months Ended
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Mar. 31, 2015
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,
| 2015 |  | 2014
Balance as of beginning of period | $ | 6 |  |  | $ | 6 |
Provision, net | 2 |  |  | 2 |
Amounts written off, less recoveries | (1 | ) |  | (1 | )
Balance as of end of period | $ | 7 |  |  | $ | 7 |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| March 31, 2015 |  | December 31, 2014
Prepaid expenses | $ | 58 |  |  | $ | 39 |
Current deferred income tax asset | 33 |  |  | 33 |
Margin deposits | 20 |  |  | 11 |
Accrued sales tax refund related to Tucannon River Wind Farm | 11 |  |  | 23 |
Assets from price risk management activities | 7 |  |  | 6 |
Other | 4 |  |  | 3 |
Other current assets | $ | 133 |  |  | $ | 115 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| March 31, 2015 |  | December 31, 2014
Electric utility plant | $ | 8,251 |  |  | $ | 8,161 |
Construction work-in-progress | 478 |  |  | 417 |
Total cost | 8,729 |  |  | 8,578 |
Less: accumulated depreciation and amortization | (2,940 | ) |  | (2,899 | )
Electric utility plant, net | $ | 5,789 |  |  | $ | 5,679 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| March 31, 2015 |  | December 31, 2014
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 100 |  |  | $ | 174 |  |  | $ | 100 |  |  | $ | 121 |
Pension and other postretirement plans | — |  |  | 242 |  |  | — |  |  | 247 |
Deferred income taxes | — |  |  | 87 |  |  | — |  |  | 86 |
Debt issuance costs | — |  |  | 15 |  |  | — |  |  | 15 |
Deferred capital projects | 14 |  |  | — |  |  | 19 |  |  | — |
Other | 11 |  |  | 27 |  |  | 14 |  |  | 25 |
Total regulatory assets | $ | 125 |  |  | $ | 545 |  |  | $ | 133 |  |  | $ | 494 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 813 |  |  | $ | — |  |  | $ | 804 |
Trojan decommissioning activities | 22 |  |  | 29 |  |  | 23 |  |  | 34 |
Asset retirement obligations | — |  |  | 40 |  |  | — |  |  | 39 |
Other | 37 |  |  | 29 |  |  | 37 |  |  | 29 |
Total regulatory liabilities | $ | 59 |  | * | $ | 911 |  |  | $ | 60 |  | * | $ | 906 |
* | 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, 2015 |  | December 31, 2014
Regulatory liabilities—current | $ | 59 |  |  | $ | 60 |
Accrued employee compensation and benefits | 39 |  |  | 51 |
Accrued interest payable | 40 |  |  | 26 |
Accrued dividends payable | 22 |  |  | 23 |
Accrued taxes payable | 26 |  |  | 22 |
Other | 57 |  |  | 54 |
Total accrued expenses and other current liabilities | $ | 243 |  |  | $ | 236 |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Components of net periodic benefit cost are as follows for the three months ended March 31 (in millions):
| Defined Benefit Pension Plan |  | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 4 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | — |
Interest cost | 8 |  |  | 9 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | — |  |  | — |
Amortization of net actuarial loss | 5 |  |  | 4 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 7 |  |  | $ | 7 |  |  | $ | 2 |  |  | $ | 1 |

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