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Retirement benefits (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Maximum
Sep. 30, 2012
American Savings Bank (ASB)
Sep. 30, 2012
Hawaiian Electric Industries, Inc.
Sep. 30, 2011
Hawaiian Electric Industries, Inc.
Dec. 31, 2011
Hawaiian Electric Industries, Inc.
Sep. 30, 2012
Electric utility
Sep. 30, 2011
Electric utility
Dec. 31, 2011
Electric utility
Sep. 30, 2012
Pension benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2011
Pension benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2012
Pension benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2011
Pension benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2012
Other benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2011
Other benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2012
Other benefits
Hawaiian Electric Industries, Inc.
Sep. 30, 2011
Other benefits
Hawaiian Electric Industries, Inc.
Defined benefit plans                                      
Contributions made to defined benefit plans $ 64,000,000         $ 2,000,000     $ 62,000,000 $ 56,000,000                  
Current estimate of contributions to defined benefit plans in current fiscal year 78,000,000   75,000,000   13,000,000 2,000,000   2,000,000 63,000,000   73,000,000                
Benefits expected to be paid directly by the company in current fiscal year 2,000,000         1,000,000     1,000,000                    
Service cost                       10,816,000 8,525,000 32,404,000 26,266,000 1,054,000 868,000 3,158,000 3,308,000
Interest cost                       16,868,000 16,137,000 50,612,000 48,717,000 2,252,000 2,273,000 6,756,000 7,151,000
Expected return on plan assets                       (17,796,000) (17,400,000) (53,388,000) (51,673,000) (2,579,000) (2,687,000) (7,757,000) (7,992,000)
Amortization of net transition obligation                       1,000 1,000 1,000 2,000        
Amortization of prior service gain                       (81,000) (98,000) (244,000) (292,000) (448,000) (587,000) (1,345,000) (1,120,000)
Amortization of net actuarial loss                       6,425,000 4,005,000 19,251,000 12,724,000 373,000 115,000 1,125,000 170,000
Net periodic benefit cost                       16,233,000 11,170,000 48,636,000 35,744,000 652,000 (18,000) 1,937,000 1,517,000
Impact of PUC D&Os                       (3,460,000) (713,000) (12,294,000) (2,813,000) (552,000) 327,000 (1,648,000) 3,079,000
Net periodic benefit cost (adjusted for impact of PUC D&Os)                       12,773,000 10,457,000 36,342,000 32,931,000 100,000 309,000 289,000 4,596,000
Funded status of retirement plan (as a percent)       80.00%                              
Retirement benefits expense           27,000,000 28,000,000                        
Defined contribution plan, expenses recognized 2,700,000 2,600,000                                  
Cash contributions by the employer to defined contribution plan $ 3,200,000 $ 3,200,000