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Credit agreements and long-term debt	3 Months Ended
Credit agreements and long-term debt	Mar. 31, 2019
Debt Disclosure [Abstract]
Credit agreements and long-term debt	Credit agreements HEI and Hawaiian Electric each entered into a separate agreement with a syndicate of eight financial institutions (the HEI Facility and Hawaiian Electric Facility, respectively, and together, the Facilities), effective July 3, 2017, to amend and restate their respective previously existing revolving unsecured credit agreements. The $150 million HEI Facility and $200 million Hawaiian Electric Facility, both terminate on June 30, 2022. As of March 31, 2019 and December 31, 2018, no amounts were outstanding under the Facilities. The Facilities will be maintained to support each company’s respective short-term commercial paper program, but may be drawn on to meet each company’s respective working capital needs and general corporate purposes.