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Retirement benefits (Tables) | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [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 June 30 |  | Six months ended June 30
|  | Pension benefits |  | Other benefits |  | Pension benefits |  | Other benefits
(in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
HEI consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 15,870 |  |  | $ | 14,913 |  |  | $ | 847 |  |  | $ | 832 |  |  | $ | 32,364 |  |  | $ | 30,304 |  |  | $ | 1,687 |  |  | $ | 1,668 |
Interest cost |  | 20,361 |  |  | 20,481 |  |  | 2,315 |  |  | 2,363 |  |  | 40,577 |  |  | 40,758 |  |  | 4,726 |  |  | 4,837 |
Expected return on plan assets |  | (25,646 | ) |  | (24,616 | ) |  | (3,104 | ) |  | (3,091 | ) |  | (51,367 | ) |  | (49,280 | ) |  | (6,170 | ) |  | (6,143 | )
Amortization of net prior service gain |  | (13 | ) |  | (14 | ) |  | (448 | ) |  | (448 | ) |  | (27 | ) |  | (28 | ) |  | (897 | ) |  | (896 | )
Amortization of net actuarial loss |  | 6,707 |  |  | 6,408 |  |  | 199 |  |  | 116 |  |  | 13,220 |  |  | 12,377 |  |  | 565 |  |  | 403 |
Net periodic pension/benefit cost |  | 17,279 |  |  | 17,172 |  |  | (191 | ) |  | (228 | ) |  | 34,767 |  |  | 34,131 |  |  | (89 | ) |  | (131 | )
Impact of PUC D&Os |  | (4,867 | ) |  | (4,765 | ) |  | 527 |  |  | 483 |  |  | (10,023 | ) |  | (8,811 | ) |  | 673 |  |  | 672 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  | $ | 12,412 |  |  | $ | 12,407 |  |  | $ | 336 |  |  | $ | 255 |  |  | $ | 24,744 |  |  | $ | 25,320 |  |  | $ | 584 |  |  | $ | 541 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 15,436 |  |  | $ | 14,465 |  |  | $ | 841 |  |  | $ | 820 |  |  | $ | 31,530 |  |  | $ | 29,398 |  |  | $ | 1,676 |  |  | $ | 1,642 |
Interest cost |  | 18,726 |  |  | 18,801 |  |  | 2,231 |  |  | 2,280 |  |  | 37,315 |  |  | 37,404 |  |  | 4,558 |  |  | 4,669 |
Expected return on plan assets |  | (23,935 | ) |  | (22,885 | ) |  | (3,056 | ) |  | (3,046 | ) |  | (47,946 | ) |  | (45,817 | ) |  | (6,073 | ) |  | (6,049 | )
Amortization of net prior service loss (gain) |  | 2 |  |  | 3 |  |  | (451 | ) |  | (451 | ) |  | 4 |  |  | 7 |  |  | (902 | ) |  | (902 | )
Amortization of net actuarial loss |  | 6,190 |  |  | 5,885 |  |  | 192 |  |  | 113 |  |  | 12,196 |  |  | 11,346 |  |  | 551 |  |  | 397 |
Net periodic pension/benefit cost |  | 16,419 |  |  | 16,269 |  |  | (243 | ) |  | (284 | ) |  | 33,099 |  |  | 32,338 |  |  | (190 | ) |  | (243 | )
Impact of PUC D&Os |  | (4,867 | ) |  | (4,765 | ) |  | 527 |  |  | 483 |  |  | (10,023 | ) |  | (8,811 | ) |  | 673 |  |  | 672 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  | $ | 11,552 |  |  | $ | 11,504 |  |  | $ | 284 |  |  | $ | 199 |  |  | $ | 23,076 |  |  | $ | 23,527 |  |  | $ | 483 |  |  | $ | 429 |

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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://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 + Details
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