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Retirement benefits (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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 |  |  | $ 43,000,000 | $ 25,000,000 |
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 |  |  | $ 4,800,000 | 5,100,000 |
Cash contributions by the employer to defined contribution plan |  |  | 5,900,000 | 5,000,000 |
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 |  |  | 40,000,000 | 22,000,000 |
Defined contribution plan, expenses recognized |  |  | 1,700,000 | 1,400,000 |
Cash contributions by the employer to defined contribution plan |  |  | 1,700,000 | 1,400,000 |
Pension benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Contributions made to defined benefit plans |  |  | 38,000,000 | 50,000,000 |
Contributions expected to be paid in current year | 38,000,000 |  | 38,000,000 |  | 67,000,000
Service cost | 17,223,000 | $ 16,271,000 | 51,764,000 | 48,635,000 |
Interest cost | 19,340,000 | 20,304,000 | 58,033,000 | 60,881,000 |
Expected return on plan assets | (27,237,000) | (25,689,000) | (81,715,000) | (77,056,000) |
Amortization of net prior service gain | (11,000) | (14,000) | (32,000) | (41,000) |
Amortization of net actuarial loss | 7,527,000 | 6,638,000 | 22,556,000 | 19,858,000 |
Net periodic pension/benefit cost (return) | 16,842,000 | 17,510,000 | 50,606,000 | 52,277,000 |
Impact of PUC D&Os | 7,785,000 | (4,534,000) | 17,621,000 | (14,557,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,627,000 | 12,976,000 | 68,227,000 | 37,720,000 |
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 |  |  | 37,000,000 | 49,000,000 |
Contributions expected to be paid in current year | 37,000,000 |  | 37,000,000 |  | $ 66,000,000
Service cost | 16,840,000 | 15,764,000 | 50,520,000 | 47,294,000 |
Interest cost | 17,824,000 | 18,659,000 | 53,471,000 | 55,974,000 |
Expected return on plan assets | (25,593,000) | (23,973,000) | (76,777,000) | (71,919,000) |
Amortization of net prior service gain | 2,000 | 2,000 | 6,000 | 6,000 |
Amortization of net actuarial loss | 6,826,000 | 6,098,000 | 20,477,000 | 18,294,000 |
Net periodic pension/benefit cost (return) | 15,899,000 | 16,550,000 | 47,697,000 | 49,649,000 |
Impact of PUC D&Os | 7,785,000 | (4,534,000) | 17,621,000 | (14,557,000) |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 23,684,000 | 12,016,000 | 65,318,000 | 35,092,000 |
Other benefits |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 680,000 | 843,000 | 2,041,000 | 2,530,000 |
Interest cost | 1,986,000 | 2,363,000 | 5,947,000 | 7,089,000 |
Expected return on plan assets | (3,224,000) | (3,078,000) | (9,683,000) | (9,248,000) |
Amortization of net prior service gain | (451,000) | (448,000) | (1,354,000) | (1,345,000) |
Amortization of net actuarial loss | 25,000 | 283,000 | 71,000 | 848,000 |
Net periodic pension/benefit cost (return) | (984,000) | (37,000) | (2,978,000) | (126,000) |
Impact of PUC D&Os | 953,000 | 346,000 | 3,048,000 | 1,019,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (31,000) | 309,000 | 70,000 | 893,000 |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined benefit plans |  |  |  |  |
Service cost | 676,000 | 839,000 | 2,028,000 | 2,515,000 |
Interest cost | 1,907,000 | 2,279,000 | 5,721,000 | 6,837,000 |
Expected return on plan assets | (3,178,000) | (3,037,000) | (9,534,000) | (9,110,000) |
Amortization of net prior service gain | (451,000) | (451,000) | (1,353,000) | (1,353,000) |
Amortization of net actuarial loss | 25,000 | 275,000 | 74,000 | 826,000 |
Net periodic pension/benefit cost (return) | (1,021,000) | (95,000) | (3,064,000) | (285,000) |
Impact of PUC D&Os | 953,000 | 346,000 | 3,048,000 | 1,019,000 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (68,000) | $ 251,000 | $ (16,000) | $ 734,000 |

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