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Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Revenues (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer [Abstract]
General payment period									30 days
Disaggregation of Revenue [Line Items]
Revenues									$ 2,614,831		$ 2,380,654
Revenues	$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	2,860,849	$ 2,555,625	2,380,654
Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									47,300
Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									2,567,531
Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									801,846
Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									853,672
Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									894,770
Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									17,243
Bank fees
Disaggregation of Revenue [Line Items]
Revenues									47,300
Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									246,018
Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									(37,687)
Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									258,225
Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									8,750
Other
Disaggregation of Revenue [Line Items]
Revenues									16,730
Hawaiian Electric Company, Inc. and Subsidiaries
Disaggregation of Revenue [Line Items]
Revenue taxes, other than income tax expense									226,000	202,000	187,000
Revenue taxes accrued	$ 130,000				$ 115,000				130,000	115,000
Electric utility
Disaggregation of Revenue [Line Items]
Revenues									2,567,531		2,094,368
Revenues									2,546,525	2,257,566	2,094,368
Electric utility \| Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility \| Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									2,567,531
Electric utility \| Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									801,846
Electric utility \| Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									853,672
Electric utility \| Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									894,770
Electric utility \| Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									17,243
Electric utility \| Bank fees
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility \| Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									(21,006)
Electric utility \| Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									(37,687)
Electric utility \| Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility \| Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility \| Other
Disaggregation of Revenue [Line Items]
Revenues									16,681
Bank
Disaggregation of Revenue [Line Items]
Revenues									47,300		285,924
Revenues									314,275	297,640	285,924
Bank \| Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									47,300
Bank \| Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Bank fees
Disaggregation of Revenue [Line Items]
Revenues									47,300
Bank \| Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									266,975
Bank \| Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									0
Bank \| Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									258,225
Bank \| Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									8,750
Bank \| Other
Disaggregation of Revenue [Line Items]
Revenues									0
Other
Disaggregation of Revenue [Line Items]
Revenues									0		362
Revenues									49	$ 419	$ 362
Other \| Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Bank fees
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									49
Other \| Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									0
Other \| Other
Disaggregation of Revenue [Line Items]
Revenues									$ 49