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Income taxes - Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Regulatory liabilities, excluding amounts attributable to property, plant and equipment | $ 104,984,000 | $ 0
Net operating loss | 0 | 0
Allowance for bad debts | 16,192,000 | 24,500,000
Other | 24,397,000 | 47,201,000
Total deferred tax assets | 145,573,000 | 71,701,000
Deferred tax liabilities |  |
Property, plant and equipment related | 415,452,000 | 642,266,000
Regulatory assets, excluding amounts attributable to property, plant and equipment | 38,314,000 | 35,107,000
Deferred RAM and RBA revenues | 15,038,000 | 26,053,000
Retirement benefits | 32,952,000 | 48,400,000
Other | 32,247,000 | 48,681,000
Total deferred tax liabilities | 534,003,000 | 800,507,000
Net deferred income tax liability | 388,430,000 | 728,806,000
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Deferred tax assets |  |
Regulatory liabilities, excluding amounts attributable to property, plant and equipment | 104,984,000 | 0
Net operating loss | 0 | 9,158,000
Allowance for bad debts | 1,812,000 | 2,364,000
Other | 11,253,000 | 18,720,000
Total deferred tax assets | 118,049,000 | 30,242,000
Deferred tax liabilities |  |
Property, plant and equipment related | 413,891,000 | 640,667,000
Regulatory assets, excluding amounts attributable to property, plant and equipment | 38,314,000 | 35,107,000
Deferred RAM and RBA revenues | 15,038,000 | 26,053,000
Retirement benefits | 38,020,000 | 51,445,000
Other | 6,827,000 | 10,629,000
Total deferred tax liabilities | 512,090,000 | 763,901,000
Net deferred income tax liability | $ 394,041,000 | $ 733,659,000

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