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Cash flows (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates $ 62 $ 61
Income taxes paid 2 0
Supplemental disclosures of noncash activities    
Common stock dividends reinvested in HEI common stock 18 18
Increases in common stock related to director and officer compensatory plans 3 5
Additions to electric utility property, plant and equipment - Unpaid invoices and other 17 27
Real estate acquired in settlement of loans 4 7
Loans transferred from held-for-investment to held-for-sale $ 25