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Retirement benefits (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Defined benefit plans |  |  |  |  |
Expected payments for remainder of fiscal year | $ 3,000,000 |  | $ 3,000,000 |  | $ 2,000,000
Retirement benefits expense |  |  | $ 29,000,000 | $ 27,000,000 |
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 |  |  | $ 3,600,000 | 3,200,000 |
Cash contributions by the employer to defined contribution plan |  |  | 4,900,000 | 4,800,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Expected payments for remainder of fiscal year | 1,000,000 |  | 1,000,000 |  | 1,000,000
Retirement benefits expense |  |  | 29,000,000 | 25,000,000 |
Defined contribution plan, expenses recognized |  |  | 1,300,000 | 1,100,000 |
Cash contributions by the employer to defined contribution plan |  |  | 1,300,000 | 1,100,000 |
Pension benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions made to defined benefit plans |  |  | 24,000,000 | 32,000,000 |
Contributions expected to be paid in current year | 48,000,000 |  | 48,000,000 |  | 39,000,000
Service cost | 15,382,000 | $ 17,428,000 | 30,764,000 | 34,541,000 |
Interest cost | 21,033,000 | 19,459,000 | 42,066,000 | 38,693,000 |
Expected return on plan assets | (27,999,000) | (27,224,000) | (55,997,000) | (54,478,000) |
Amortization of net prior service gain | (11,000) | (11,000) | (22,000) | (21,000) |
Amortization of net actuarial (gains) losses | 3,839,000 | 7,634,000 | 7,678,000 | 15,029,000 |
Net periodic pension/benefit cost (return) | 12,244,000 | 17,286,000 | 24,489,000 | 33,764,000 |
Impact of PUC D&Os | 12,278,000 | 7,179,000 | 24,557,000 | 9,836,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,522,000 | 24,465,000 | 49,046,000 | 43,600,000 |
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 |  |  | 23,000,000 | 32,000,000 |
Contributions expected to be paid in current year | 47,000,000 |  | 47,000,000 |  | $ 38,000,000
Service cost | 15,001,000 | 17,007,000 | 30,002,000 | 33,680,000 |
Interest cost | 19,414,000 | 17,937,000 | 38,828,000 | 35,647,000 |
Expected return on plan assets | (26,164,000) | (25,577,000) | (52,328,000) | (51,184,000) |
Amortization of net prior service gain | 2,000 | 2,000 | 4,000 | 4,000 |
Amortization of net actuarial (gains) losses | 3,576,000 | 6,941,000 | 7,152,000 | 13,651,000 |
Net periodic pension/benefit cost (return) | 11,829,000 | 16,310,000 | 23,658,000 | 31,798,000 |
Impact of PUC D&Os | 12,278,000 | 7,179,000 | 24,557,000 | 9,836,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,107,000 | 23,489,000 | 48,215,000 | 41,634,000 |
Other benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 542,000 | 692,000 | 1,083,000 | 1,361,000 |
Interest cost | 1,997,000 | 2,030,000 | 3,994,000 | 3,961,000 |
Expected return on plan assets | (3,086,000) | (3,267,000) | (6,172,000) | (6,459,000) |
Amortization of net prior service gain | (452,000) | (451,000) | (904,000) | (903,000) |
Amortization of net actuarial (gains) losses | (4,000) | 48,000 | (7,000) | 46,000 |
Net periodic pension/benefit cost (return) | (1,003,000) | (948,000) | (2,006,000) | (1,994,000) |
Impact of PUC D&Os | 811,000 | 1,024,000 | 1,622,000 | 2,095,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (192,000) | 76,000 | (384,000) | 101,000 |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 538,000 | 688,000 | 1,075,000 | 1,352,000 |
Interest cost | 1,918,000 | 1,955,000 | 3,835,000 | 3,814,000 |
Expected return on plan assets | (3,036,000) | (3,216,000) | (6,071,000) | (6,356,000) |
Amortization of net prior service gain | (451,000) | (451,000) | (902,000) | (902,000) |
Amortization of net actuarial (gains) losses | 0 | 49,000 | 0 | 49,000 |
Net periodic pension/benefit cost (return) | (1,031,000) | (975,000) | (2,063,000) | (2,043,000) |
Impact of PUC D&Os | 811,000 | 1,024,000 | 1,622,000 | 2,095,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (220,000) | $ 49,000 | $ (441,000) | $ 52,000 |

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