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Balance Sheet Components (Tables) | 3 Months Ended
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Mar. 31, 2013
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,
| 2013 |  | 2012
Balance as of beginning of period | $ | 5 |  |  | $ | 6 |
Provision, net | 2 |  |  | 1 |
Amounts written off, less recoveries | (1 | ) |  | (1 | )
Balance as of end of period | $ | 6 |  |  | $ | 6 |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| March 31, 2013 |  | December 31, 2012
Prepaid expenses | $ | 51 |  |  | $ | 37 |
Current deferred income tax asset | 38 |  |  | 51 |
Assets from price risk management activities | 11 |  |  | 4 |
Other | 5 |  |  | 1 |
Other current assets | $ | 105 |  |  | $ | 93 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| March 31, 2013 |  | December 31, 2012
Electric utility plant | $ | 6,850 |  |  | $ | 6,811 |
Construction work in progress | 201 |  |  | 140 |
Total cost | 7,051 |  |  | 6,951 |
Less: accumulated depreciation and amortization | (2,602 | ) |  | (2,559 | )
Electric utility plant, net | $ | 4,449 |  |  | $ | 4,392 |
Accumulated depreciation and amortization in the table above includes accumulated amortization related to intangible assets of $156 million and $151 million as of March 31, 2013 and December 31, 2012, respectively.
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| March 31, 2013 |  | December 31, 2012
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 80 |  |  | $ | 77 |  |  | $ | 123 |  |  | $ | 71 |
Pension and other postretirement plans | — |  |  | 314 |  |  | — |  |  | 321 |
Deferred income taxes | — |  |  | 78 |  |  | — |  |  | 80 |
Deferred broker settlements | 15 |  |  | 1 |  |  | 20 |  |  | 1 |
Debt reacquisition costs | — |  |  | 20 |  |  | — |  |  | 22 |
Deferred capital projects | — |  |  | 19 |  |  | — |  |  | 16 |
Other | 1 |  |  | 15 |  |  | 1 |  |  | 13 |
Total regulatory assets | $ | 96 |  |  | $ | 524 |  |  | $ | 144 |  |  | $ | 524 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 706 |  |  | $ | — |  |  | $ | 692 |
Asset retirement obligations | — |  |  | 40 |  |  | — |  |  | 39 |
Power cost adjustment mechanism | 4 |  |  | — |  |  | 6 |  |  | — |
Other | 7 |  |  | 36 |  |  | 6 |  |  | 34 |
Total regulatory liabilities | $ | 11 |  | (1) | $ | 782 |  |  | $ | 12 |  | (1) | $ | 765 |
(1) 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, 2013 |  | December 31, 2012
Accrued employee compensation and benefits | $ | 36 |  |  | $ | 46 |
Accrued interest payable | 33 |  |  | 23 |
Accrued taxes payable | 30 |  |  | 21 |
Accrued dividends payable | 20 |  |  | 21 |
Regulatory liabilities—current | 11 |  |  | 12 |
Other | 62 |  |  | 56 |
Total accrued expenses and other current liabilities | $ | 192 |  |  | $ | 179 |
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 |  | Non-Qualified Benefit Plans
| 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Interest cost | 8 |  |  | 8 |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 6 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 8 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1 |

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