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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | $ 33,420 | $ 45,688
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 5,706 | 2,503
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (5,158) | (2,298)
Other comprehensive income, net of taxes | 18,212 | 9,241
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 51,632 | 54,929
Consolidating adjustments |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | (8,804) | (11,849)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | (1,400) | (641)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 1,399 | 640
Other comprehensive income, net of taxes | (1) | (1)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | (8,805) | (11,850)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 23,905 | 32,126
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 5,184 | 2,322
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (5,158) | (2,298)
Other comprehensive income, net of taxes | 26 | 24
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 23,931 | 32,150
HELCO | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 6,067 | 5,169
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 748 | 352
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (747) | (351)
Other comprehensive income, net of taxes | 1 | 1
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 6,068 | 5,170
Maui Electric | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 2,737 | 6,680
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 652 | 289
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (652) | (289)
Other comprehensive income, net of taxes | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 2,737 | 6,680
Other subsidiaries | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 0 | 0
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 0 | 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 0 | 0
Other comprehensive income, net of taxes | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 23,905 | 32,126
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 5,184 | 2,322
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (5,158) | (2,298)
Other comprehensive income, net of taxes | 26 | 24
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | $ 23,931 | $ 32,150

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