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Retirement benefits (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Defined benefit plans |  |  |  |  |
Expected payments for remainder of fiscal year | $ 2,000,000 |  | $ 2,000,000 |  | $ 1,000,000
Retirement benefits expense |  |  | $ 27,000,000 | $ 17,000,000 |
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 |  |  | $ 3,200,000 | 3,300,000 |
Cash contributions by the employer to defined contribution plan |  |  | 4,800,000 | 4,000,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Expected payments for remainder of fiscal year | 1,000,000 |  | 1,000,000 |  | 500,000
Retirement benefits expense |  |  | 25,000,000 | 15,000,000 |
Defined contribution plan, expenses recognized |  |  | 1,100,000 | 1,000,000 |
Cash contributions by the employer to defined contribution plan |  |  | 1,100,000 | 1,000,000 |
Pension benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions made to defined benefit plans |  |  | 32,000,000 | 33,000,000 |
Contributions expected to be paid in current year | 42,000,000 |  | 42,000,000 |  | 67,000,000
Service cost | 17,428,000 | $ 15,870,000 | 34,541,000 | 32,364,000 |
Interest cost | 19,459,000 | 20,361,000 | 38,693,000 | 40,577,000 |
Expected return on plan assets | (27,224,000) | (25,646,000) | (54,478,000) | (51,367,000) |
Amortization of net prior service gain | (11,000) | (13,000) | (21,000) | (27,000) |
Amortization of net actuarial loss | 7,634,000 | 6,707,000 | 15,029,000 | 13,220,000 |
Net periodic pension/benefit cost (return) | 17,286,000 | 17,279,000 | 33,764,000 | 34,767,000 |
Impact of PUC D&Os | 7,179,000 | (4,867,000) | 9,836,000 | (10,023,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,465,000 | 12,412,000 | 43,600,000 | 24,744,000 |
Pension benefits | American Savings Bank (ASB) |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions expected to be paid in current year | 0 |  | 0 |  | 0
Pension benefits | Hawaiian Electric Industries, Inc. |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions expected to be paid in current year | 1,000,000 |  | 1,000,000 |  | 1,000,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions made to defined benefit plans |  |  | 32,000,000 | 33,000,000 |
Contributions expected to be paid in current year | 41,000,000 |  | 41,000,000 |  | $ 66,000,000
Service cost | 17,007,000 | 15,436,000 | 33,680,000 | 31,530,000 |
Interest cost | 17,937,000 | 18,726,000 | 35,647,000 | 37,315,000 |
Expected return on plan assets | (25,577,000) | (23,935,000) | (51,184,000) | (47,946,000) |
Amortization of net prior service gain | 2,000 | 2,000 | 4,000 | 4,000 |
Amortization of net actuarial loss | 6,941,000 | 6,190,000 | 13,651,000 | 12,196,000 |
Net periodic pension/benefit cost (return) | 16,310,000 | 16,419,000 | 31,798,000 | 33,099,000 |
Impact of PUC D&Os | 7,179,000 | (4,867,000) | 9,836,000 | (10,023,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 23,489,000 | 11,552,000 | 41,634,000 | 23,076,000 |
Other benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 692,000 | 847,000 | 1,361,000 | 1,687,000 |
Interest cost | 2,030,000 | 2,315,000 | 3,961,000 | 4,726,000 |
Expected return on plan assets | (3,267,000) | (3,104,000) | (6,459,000) | (6,170,000) |
Amortization of net prior service gain | (451,000) | (448,000) | (903,000) | (897,000) |
Amortization of net actuarial loss | 48,000 | 199,000 | 46,000 | 565,000 |
Net periodic pension/benefit cost (return) | (948,000) | (191,000) | (1,994,000) | (89,000) |
Impact of PUC D&Os | 1,024,000 | 527,000 | 2,095,000 | 673,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 76,000 | 336,000 | 101,000 | 584,000 |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 688,000 | 841,000 | 1,352,000 | 1,676,000 |
Interest cost | 1,955,000 | 2,231,000 | 3,814,000 | 4,558,000 |
Expected return on plan assets | (3,216,000) | (3,056,000) | (6,356,000) | (6,073,000) |
Amortization of net prior service gain | (451,000) | (451,000) | (902,000) | (902,000) |
Amortization of net actuarial loss | 49,000 | 192,000 | 49,000 | 551,000 |
Net periodic pension/benefit cost (return) | (975,000) | (243,000) | (2,043,000) | (190,000) |
Impact of PUC D&Os | 1,024,000 | 527,000 | 2,095,000 | 673,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ 49,000 | $ 284,000 | $ 52,000 | $ 483,000 |

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