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Balance Sheet Components Other Current Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Other Current Assets [Line Items]    
Prepaid expenses $ 32 $ 39
Current deferred income tax asset 33 33
Margin deposits 28 11
Accrued sales tax refund related to Tucannon River Wind Farm 0 23
Assets from price risk management activities 3 6
Other 1 3
Other current assets $ 97 $ 115