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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Current Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management $ 61 $ 120
Pension and other postretirement plans 0 0
Deferred income taxes 0 0
Debt issuance costs 0 0
Other 4 9
Total regulatory assets 65 129
Noncurrent Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management 161 161
Pension and other postretirement plans 228 239
Deferred income taxes 80 86
Debt issuance costs 23 16
Other 23 22
Total regulatory assets 515 524
Current Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 0 0
Trojan decommissioning activities 24 17
Asset retirement obligations 0 0
Other 25 38
Total regulatory liabilities 49 55
Noncurrent Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 872 837
Trojan decommissioning activities 4 15
Asset retirement obligations 48 45
Other 34 31
Total regulatory liabilities $ 958 $ 928