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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property, Plant and Equipment [Line Items] |  |  |
Expenses related to Cascade Crossing | $ 52 | $ 0 | $ 0
Business days after the invoice date | 16 |  |
Days after the due date | 45 |  |
Wholesale accounts receivable written off | 0 | 0 | 0
Other Investments | 104 | 0 |
Margin deposit | 9 | 46 |
Letters of Credit Outstanding, Amount | 29 | 45 |
Public Utilities, Allowance for Funds Used During Construction, Rate | 7.50% | 7.50% | 7.80%
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest | 7 | 4 | 3
Allowance for equity funds used during construction | 13 | 6 | 5
Depreciation expense rate | 3.70% | 3.80% | 3.70%
Asset Retirement Removal Costs Included in Depreciation Expense | 55 | 55 | 49
Finite-Lived Intangible Assets, Accumulated Amortization | 170 | 151 |
Amortization of Intangible Assets | 22 | 22 | 19
Future Amortization Expense, Year One | 23 |  |
Future Amortization Expense, Year Two | 22 |  |
Future Amortization Expense, Year Three | 19 |  |
Future Amortization Expense, Year Four | 16 |  |
Future Amortization Expense, Year Five | 14 |  |
Power Cost Deadband - Lower Threshold | 15 |  |
Power Cost Deadband - Upper Threshold | 30 |  |
Net variable power cost overrun | 11 |  |
Net Variable Power Cost Underrun |  | 17 | 34
Estimated Refund Under Power Cost Adjustment Mechanism | 0 | 0 | (10)
Potential Refund Under the PCAM |  | 17 |
Actual Refund Under Power Cost Adjustment Mechanism |  | 0 | (6)
Franchise taxes | 41 | 42 | 41
Deferred Tax Assets, Regulatory Assets and Liabilities | 16 | 20 |
Noncurrent Regulatory Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Deferred Tax Assets, Regulatory Assets and Liabilities | $ 76 | $ 80 |

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