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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Regulatory Assets [Line Items]    
Remaining Recovery Period of Regulatory Assets, Price Risk Management 2 years  
Remaining Recovery Period of Regulatory Asset, Deferred Broker Settlements 1 year  
Remaining Recovery Period of Regulatory Asset, Debt Reacquisition Costs 7 years  
Price risk management $ 19 $ 13
Deferred income taxes 22 37
Asset retirement obligations 87 64
Current Regulatory Liabilities [Member]
    
Regulatory Assets [Line Items]    
Asset retirement removal costs 0 0
Asset retirement obligations 0 0
Power Cost Adjustment Mechanism 0 0
Trojan ISFSI pollution control tax credits 0 18
Other 6 7
Total regulatory liabilities 6 25
Noncurrent Regulatory Liabilities [Member]
    
Regulatory Assets [Line Items]    
Asset retirement removal costs 637 588
Asset retirement obligations 36 33
Power Cost Adjustment Mechanism 10 0
Trojan ISFSI pollution control tax credits 7 4
Other 30 32
Total regulatory liabilities 720 657
Regulatory Assets, Current [Member]
    
Regulatory Assets [Line Items]    
Price risk management 194 175
Pension and other postretirement plans 0 0
Deferred income taxes 0 0
Deferred broker settlements 11 24
Renewable energy deferral 1 22
Debt reacquisition costs 0 0
Other 10 0
Total regulatory assets 216 221
Noncurrent Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Price risk management 172 185
Pension and other postretirement plans 295 213
Deferred income taxes 87 95
Deferred broker settlements 0 0
Renewable energy deferral 0 0
Debt reacquisition costs 28 23
Other 12 28
Total regulatory assets $ 594 $ 544