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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2014
Balance Sheet Components [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | The following is the activity in the allowance for uncollectible accounts (in millions):
| Years Ended December 31,
| 2014 |  | 2013 |  | 2012
Balance as of beginning of year | $ | 6 |  |  | $ | 5 |  |  | $ | 6 |
Increase in provision | 6 |  |  | 6 |  |  | 6 |
Amounts written off, less recoveries | (6 | ) |  | (5 | ) |  | (7 | )
Balance as of end of year | $ | 6 |  |  | $ | 6 |  |  | $ | 5 |
Investments held in trust [Table Text Block] | The trusts are comprised of the following investments as of December 31 (in millions):
| Nuclear Decommissioning Trust |  | Non-Qualified Benefit Plan Trust
| 2014 |  | 2013 |  | 2014 |  | 2013
Cash equivalents | $ | 65 |  |  | $ | 59 |  |  | $ | — |  |  | $ | — |
Marketable securities, at fair value: |  |  |  |  |  |  |
Equity securities | — |  |  | — |  |  | 6 |  |  | 8 |
Debt securities | 25 |  |  | 23 |  |  | — |  |  | 1 |
Insurance contracts, at cash surrender value | — |  |  | — |  |  | 26 |  |  | 26 |
| $ | 90 |  |  | $ | 82 |  |  | $ | 32 |  |  | $ | 35 |
Schedule of Other Assets and Other Liabilities [Table Text Block] | Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):
| As of December 31,
| 2014 |  | 2013
Other current assets: |  |  |
Prepaid expenses | $ | 39 |  |  | $ | 38 |
Current deferred income tax asset | 33 |  |  | 42 |
Accrued sales tax refund related to Tucannon River Wind Farm | 23 |  |  | — |
Margin deposits | 11 |  |  | 9 |
Assets from price risk management activities | 6 |  |  | 13 |
Other | 3 |  |  | 1 |
| $ | 115 |  |  | $ | 103 |
Accrued expenses and other current liabilities: |  |  |
Regulatory liabilities—current | $ | 60 |  |  | $ | 1 |
Accrued employee compensation and benefits | 51 |  |  | 46 |
Accrued interest payable | 26 |  |  | 23 |
Dividends payable | 23 |  |  | 22 |
Accrued taxes payable | 22 |  |  | 21 |
Other | 54 |  |  | 58 |
| $ | 236 |  |  | $ | 171 |

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- Definition investments held in trust [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of other assets and other liabilities not separately disclosed on the balance sheet. + References No definition available. + 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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