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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Regulatory Assets and Liabilities [Line Items]    
Trojan decommissioning activities $ 43 $ 41
Current Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management 98 100
Pension and other postretirement plans 0 0
Deferred income taxes 0 0
Debt issuance costs 0 0
Deferred capital projects 10 19
Other 9 14
Total regulatory assets 117 133
Noncurrent Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management 186 121
Pension and other postretirement plans 237 247
Deferred income taxes 87 86
Debt issuance costs 17 15
Deferred capital projects 0 0
Other 25 25
Total regulatory assets 552 494
Current Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 0 0
Trojan decommissioning activities 21 23
Asset retirement obligations 0 0
Other 32 37
Total regulatory liabilities 53 60
Noncurrent Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 824 804
Trojan decommissioning activities 24 34
Asset retirement obligations 42 39
Other 33 29
Total regulatory liabilities $ 923 $ 906