COMMON STOCK: Level 4 (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Shareholders' equity [Line Items]
Maximum leverage ratio requirement	0.65
Idaho Power Company
Shareholders' equity [Line Items]
Maximum leverage ratio requirement	0.65
Ratio of Indebtedness to Net Capital	0.48
Dividend Distribution Restriction Amount	$ 860
Dividend Distribution Restriction Threshold	0.35
Ratio of total Capital to total capital and long-term debt	0.52
Preferred Stock, Shares Outstanding	0
IDACORP
Shareholders' equity [Line Items]
Stock Issued During Period, Shares, New Issues	74,049
Ratio of Indebtedness to Net Capital	0.47
Dividend Distribution Restriction Amount	$ 962
IDACORP | Continuous equity program
Shareholders' equity [Line Items]
Stock Issued During Period, Shares, New Issues	0
Remaining shares available under sales agency agreement	3,000,000