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Retirement benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit cost for consolidated HEI | The components of NPPC and NPBC for HEI consolidated and Hawaiian Electric consolidated were as follows:
|  | Three months ended September 30 |  | Nine months ended September 30
|  | Pension benefits |  | Other benefits |  | Pension benefits |  | Other benefits
(in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
HEI consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 17,223 |  |  | $ | 16,271 |  |  | $ | 680 |  |  | $ | 843 |  |  | $ | 51,764 |  |  | $ | 48,635 |  |  | $ | 2,041 |  |  | $ | 2,530 |
Interest cost |  | 19,340 |  |  | 20,304 |  |  | 1,986 |  |  | 2,363 |  |  | 58,033 |  |  | 60,881 |  |  | 5,947 |  |  | 7,089 |
Expected return on plan assets |  | (27,237 | ) |  | (25,689 | ) |  | (3,224 | ) |  | (3,078 | ) |  | (81,715 | ) |  | (77,056 | ) |  | (9,683 | ) |  | (9,248 | )
Amortization of net prior service gain |  | (11 | ) |  | (14 | ) |  | (451 | ) |  | (448 | ) |  | (32 | ) |  | (41 | ) |  | (1,354 | ) |  | (1,345 | )
Amortization of net actuarial loss |  | 7,527 |  |  | 6,638 |  |  | 25 |  |  | 283 |  |  | 22,556 |  |  | 19,858 |  |  | 71 |  |  | 848 |
Net periodic pension/benefit cost (return) |  | 16,842 |  |  | 17,510 |  |  | (984 | ) |  | (37 | ) |  | 50,606 |  |  | 52,277 |  |  | (2,978 | ) |  | (126 | )
Impact of PUC D&Os |  | 7,785 |  |  | (4,534 | ) |  | 953 |  |  | 346 |  |  | 17,621 |  |  | (14,557 | ) |  | 3,048 |  |  | 1,019 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  | $ | 24,627 |  |  | $ | 12,976 |  |  | $ | (31 | ) |  | $ | 309 |  |  | $ | 68,227 |  |  | $ | 37,720 |  |  | $ | 70 |  |  | $ | 893 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 16,840 |  |  | $ | 15,764 |  |  | $ | 676 |  |  | $ | 839 |  |  | $ | 50,520 |  |  | $ | 47,294 |  |  | $ | 2,028 |  |  | $ | 2,515 |
Interest cost |  | 17,824 |  |  | 18,659 |  |  | 1,907 |  |  | 2,279 |  |  | 53,471 |  |  | 55,974 |  |  | 5,721 |  |  | 6,837 |
Expected return on plan assets |  | (25,593 | ) |  | (23,973 | ) |  | (3,178 | ) |  | (3,037 | ) |  | (76,777 | ) |  | (71,919 | ) |  | (9,534 | ) |  | (9,110 | )
Amortization of net prior service loss (gain) |  | 2 |  |  | 2 |  |  | (451 | ) |  | (451 | ) |  | 6 |  |  | 6 |  |  | (1,353 | ) |  | (1,353 | )
Amortization of net actuarial loss |  | 6,826 |  |  | 6,098 |  |  | 25 |  |  | 275 |  |  | 20,477 |  |  | 18,294 |  |  | 74 |  |  | 826 |
Net periodic pension/benefit cost (return) |  | 15,899 |  |  | 16,550 |  |  | (1,021 | ) |  | (95 | ) |  | 47,697 |  |  | 49,649 |  |  | (3,064 | ) |  | (285 | )
Impact of PUC D&Os |  | 7,785 |  |  | (4,534 | ) |  | 953 |  |  | 346 |  |  | 17,621 |  |  | (14,557 | ) |  | 3,048 |  |  | 1,019 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  | $ | 23,684 |  |  | $ | 12,016 |  |  | $ | (68 | ) |  | $ | 251 |  |  | $ | 65,318 |  |  | $ | 35,092 |  |  | $ | (16 | ) |  | $ | 734 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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