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Bank subsidiary (HEI only) (Details 20) (American Savings Bank (ASB), USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Guarantees        
Spread added to current assessment rate (as a percent)   0.03% 0.03%  
Prepaid assessment $ 24.0   $ 5.7  
Assessment rate ( as a percent)       0.14%
FDIC insurance assessment 2.9 3.0    
Minimum
        
Guarantees        
Assessment rate for financial institutions in the lowest risk category (as a percent) 0.025%      
Assessment rate for financial institutions in the highest risk category (as a percent) 0.30%      
Maximum
        
Guarantees        
Assessment rate for financial institutions in the lowest risk category (as a percent) 0.09%      
Assessment rate for financial institutions in the highest risk category (as a percent) 0.45%      
Indemnification Agreement
        
Guarantees        
Accrued indemnification litigation obligation $ 1.1