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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2014
Regulatory Assets [Line Items] |
Schedule of Regulatory Assets and Liabilities [Table Text Block] | Regulatory assets and liabilities consist of the following (dollars in millions):
| Weighted Average Remaining Life (1) |  | As of December 31,
| 2014 |  | 2013
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |  |  |
Price risk management (2) | 3 years |  | $ | 100 |  |  | $ | 121 |  |  | $ | 36 |  |  | $ | 140 |
Pension and other postretirement plans (2) | (3) |  | — |  |  | 247 |  |  | — |  |  | 194 |
Deferred income taxes (2) | (4) |  | — |  |  | 86 |  |  | — |  |  | 76 |
Debt issuance costs (2) | 8 years |  | — |  |  | 15 |  |  | — |  |  | 17 |
Deferred capital projects | 1 year |  | 19 |  |  | — |  |  | 16 |  |  | 18 |
Other (5) | Various |  | 14 |  |  | 25 |  |  | 14 |  |  | 19 |
Total regulatory assets |  |  | $ | 133 |  |  | $ | 494 |  |  | $ | 66 |  |  | $ | 464 |
Regulatory liabilities: |  |  |  |  |  |  |  |  |
Asset retirement removal costs (6) | (4) |  | $ | — |  |  | $ | 804 |  |  | $ | — |  |  | $ | 747 |
Trojan decommissioning activities | 2 years |  | 23 |  |  | 34 |  |  | — |  |  | 49 |
Asset retirement obligations (6) | (4) |  | — |  |  | 39 |  |  | — |  |  | 39 |
Other | Various |  | 37 |  |  | 29 |  |  | 1 |  |  | 30 |
Total regulatory liabilities |  |  | $ | 60 |  | (7) | $ | 906 |  |  | $ | 1 |  | (7) | $ | 865 |
(1) | As of December 31, 2014.
(2) | Does not include a return on investment.
(3) | Recovery expected over the average service life of employees. For additional information, see Note 2, Summary of Significant Accounting Policies.
(4) | Recovery expected over the estimated lives of the assets.
(5) | Of the total other unamortized regulatory asset balances, a return is recorded on $33 million and $16 million as of December 31, 2014 and 2013, respectively.
(6) | Included in rate base for ratemaking purposes.
(7) | Included in Accrued expenses and other current liabilities on the consolidated balance sheets.

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