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Balance Sheet Components Regulatory Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current Regulatory Assets [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Price risk management $ 40 $ 36
Pension and other postretirement plans 0 0
Deferred income taxes 0 0
Deferred broker settlements 4 12
Debt reacquisition costs 0 0
Deferred capital projects 4 16
Other 8 2
Total regulatory assets 56 66
Noncurrent Regulatory Assets [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Price risk management 76 140
Pension and other postretirement plans 180 194
Deferred income taxes 85 76
Deferred broker settlements 0 1
Debt reacquisition costs 16 17
Deferred capital projects 19 18
Other 20 18
Total regulatory assets 396 464
Current Regulatory Liabilities [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 0 0
Trojan decommissioning activities 0 0
Asset retirement obligations 0 0
Other 4 1
Total regulatory liabilities 4 1
Noncurrent Regulatory Liabilities [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 791 747
Trojan decommissioning activities 57 41
Asset retirement obligations 40 39
Other 52 38
Total regulatory liabilities $ 940 $ 865