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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Current Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management $ 69 $ 120
Pension and other postretirement plans 0 0
Deferred income taxes 0 0
Debt issuance costs 0 0
Other 5 9
Total regulatory assets 74 129
Noncurrent Regulatory Assets [Member]    
Regulatory Assets and Liabilities [Line Items]    
Price risk management 166 161
Pension and other postretirement plans 231 239
Deferred income taxes 83 86
Debt issuance costs 23 16
Other 22 22
Total regulatory assets 525 524
Current Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 0 0
Trojan decommissioning activities 26 17
Asset retirement obligations 0 0
Other 30 38
Total regulatory liabilities 56 55
Noncurrent Regulatory Liabilities [Member]    
Regulatory Assets and Liabilities [Line Items]    
Asset retirement removal costs 861 837
Trojan decommissioning activities 8 15
Asset retirement obligations 47 45
Other 33 31
Total regulatory liabilities $ 949 $ 928