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Retirement benefits (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Defined benefit plans |  |  |
Expected payments for remainder of fiscal year | $ 3,000,000 |  | $ 1,000,000
Retirement benefits expense | $ 12,000,000 | $ 9,000,000 |
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case (in years) | 5 years |  |
Defined contribution plan, expenses recognized | $ 1,600,000 | 1,500,000 |
Cash contributions by the employer to defined contribution plan | 3,700,000 | 2,900,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Expected payments for remainder of fiscal year | 1,000,000 |  | 500,000
Retirement benefits expense | 11,000,000 | 8,000,000 |
Defined contribution plan, expenses recognized | 500,000 | 500,000 |
Cash contributions by the employer to defined contribution plan | 500,000 | 500,000 |
Pension benefits |  |  |
Defined benefit plans |  |  |
Contributions made to defined benefit plans | 16,000,000 | 17,000,000 |
Contributions expected to be paid in current year | 62,000,000 |  | 67,000,000
Service cost | 17,113,000 | 16,494,000 |
Interest cost | 19,234,000 | 20,216,000 |
Expected return on plan assets | (27,254,000) | (25,721,000) |
Amortization of net prior service gain | (10,000) | (14,000) |
Amortization of net actuarial loss (gain) | 7,395,000 | 6,513,000 |
Net periodic pension/benefit cost (return) | 16,478,000 | 17,488,000 |
Impact of PUC D&Os | 2,657,000 | (5,156,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 19,135,000 | 12,332,000 |
Pension benefits | American Savings Bank (ASB) |  |  |
Defined benefit plans |  |  |
Contributions expected to be paid in current year | 0 |  | 0
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Contributions made to defined benefit plans | 15,000,000 | 17,000,000 |
Contributions expected to be paid in current year | 61,000,000 |  | 66,000,000
Service cost | 16,673,000 | 16,094,000 |
Interest cost | 17,710,000 | 18,589,000 |
Expected return on plan assets | (25,607,000) | (24,011,000) |
Amortization of net prior service gain | 2,000 | 2,000 |
Amortization of net actuarial loss (gain) | 6,710,000 | 6,006,000 |
Net periodic pension/benefit cost (return) | 15,488,000 | 16,680,000 |
Impact of PUC D&Os | 2,657,000 | (5,156,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 18,145,000 | 11,524,000 |
Pension benefits | Hawaiian Electric Industries, Inc. |  |  |
Defined benefit plans |  |  |
Contributions expected to be paid in current year | 1,000,000 |  | $ 1,000,000
Other benefits |  |  |
Defined benefit plans |  |  |
Service cost | 669,000 | 840,000 |
Interest cost | 1,931,000 | 2,411,000 |
Expected return on plan assets | (3,192,000) | (3,066,000) |
Amortization of net prior service gain | (452,000) | (449,000) |
Amortization of net actuarial loss (gain) | (2,000) | 366,000 |
Net periodic pension/benefit cost (return) | (1,046,000) | 102,000 |
Impact of PUC D&Os | 1,071,000 | 146,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 25,000 | 248,000 |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 664,000 | 835,000 |
Interest cost | 1,859,000 | 2,327,000 |
Expected return on plan assets | (3,140,000) | (3,017,000) |
Amortization of net prior service gain | (451,000) | (451,000) |
Amortization of net actuarial loss (gain) | 0 | 359,000 |
Net periodic pension/benefit cost (return) | (1,068,000) | 53,000 |
Impact of PUC D&Os | 1,071,000 | 146,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ 3,000 | $ 199,000 |

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- Definition Represents the total amount of net periodic benefit cost adjusted for impact of Public Utilities Commission's decisions and orders. + References No definition available. + Details
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- Definition Represents the number of years for which regulatory asset/liability for each utilities will be amortized, beginning with the respective utility's next rate case. + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount of contributions made by the employer to defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2709-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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