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Schedule I - Condensed Financial Information of Parent - Footnotes Schedule I Level 4 (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
IDACORP      
Significant Accounting Policies      
Proceeds from Dividends Received $ 99,000,000 $ 91,000,000 $ 91,000,000