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Balance Sheet Components Other Current Assets (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Other Current Assets [Line Items] |  |
Prepaid expenses | $ 24 | $ 39
Current deferred income tax asset | 39 | 33
Margin deposits | 20 | 11
Accrued sales tax refund related to Tucannon River Wind Farm | 0 | 23
Assets from price risk management activities | 7 | 6
Other | 2 | 3
Other current assets | $ 92 | $ 115

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