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Cash flows (Tables)
 3 Months Ended
Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Schedule of supplemental disclosures of cash and noncash activity
Three months ended March 31
 
2016
 
2015
(in millions)
 
 
 
 
Supplemental disclosures of cash flow information
 
 

 
 

HEI consolidated
 
 
 
 
Interest paid to non-affiliates
 
$
20

 
$
21

Income taxes paid
 
1

 
1

Income taxes refunded
 
45

 
47

Hawaiian Electric consolidated
 
 
 
 
Interest paid to non-affiliates
 
12

 
13

Income taxes refunded
 
20

 
6

Supplemental disclosures of noncash activities
 
 

 
 

HEI consolidated
 
 
 
 
Common stock dividends reinvested in HEI common stock 1
 
6

 
—

Real estate transferred from property, plant and equipment to other assets held-for-sale (investing)
 
—

 
5

HEI consolidated and Hawaiian Electric consolidated
 
 
 
 
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing)
 
(48
)
 
(41
)

1 The amounts shown represent common stock dividends reinvested in HEI common stock under the HEI Dividend Reinvestment and Stock Purchase Plan (DRIP) in noncash transactions. From January 6, 2016, HEI satisfied the share purchase requirements of the DRIP through new issuances of its common stock. In 2015, HEI satisfied such requirements with cash through open market purchases of its common stock.