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Retirement benefits (Details) (USD $) | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Pension benefits | Sep. 30, 2013 Pension benefits | Sep. 30, 2014 Pension benefits | Sep. 30, 2013 Pension benefits | Sep. 30, 2014 Other benefits | Sep. 30, 2013 Other benefits | Sep. 30, 2014 Other benefits | Sep. 30, 2013 Other benefits | Sep. 30, 2013 American Savings Bank (ASB) Other benefits | Sep. 30, 2014 Hawaiian Electric Industries, Inc. Other benefits | Sep. 30, 2013 Hawaiian Electric Industries, Inc. Other benefits | Sep. 30, 2014 HECO Consolidated | Sep. 30, 2013 HECO Consolidated | Dec. 31, 2013 HECO Consolidated | Sep. 30, 2014 HECO Consolidated Pension benefits | Sep. 30, 2013 HECO Consolidated Pension benefits | Sep. 30, 2014 HECO Consolidated Pension benefits | Sep. 30, 2013 HECO Consolidated Pension benefits | Sep. 30, 2014 HECO Consolidated Other benefits | Sep. 30, 2013 HECO Consolidated Other benefits | Sep. 30, 2014 HECO Consolidated Other benefits | Sep. 30, 2013 HECO Consolidated Other benefits
Defined benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions made to defined benefit plans |  |  |  |  |  | $ 45,000,000 | $ 62,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,000,000 | $ 61,000,000 |  |  |  |
Contributions expected to be paid in current year |  |  |  |  |  |  |  |  |  | 60,000,000 | 83,000,000 | 0 | 1,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  | 59,000,000 | 81,000,000
Expected payments in 2014 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Payments for benefits |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Service cost |  |  |  | 12,306,000 | 14,097,000 | 36,958,000 | 42,307,000 | 870,000 | 1,077,000 | 2,619,000 | 3,229,000 |  |  |  |  |  |  | 11,900,000 | 13,620,000 | 35,698,000 | 40,861,000 | 848,000 | 1,041,000 | 2,544,000 | 3,122,000
Interest cost |  |  |  | 18,044,000 | 16,187,000 | 54,158,000 | 48,600,000 | 2,137,000 | 1,891,000 | 6,414,000 | 5,677,000 |  |  |  |  |  |  | 16,495,000 | 14,780,000 | 49,484,000 | 44,339,000 | 2,058,000 | 1,822,000 | 6,175,000 | 5,466,000
Expected return on plan assets |  |  |  | (20,337,000) | (18,134,000) | (61,018,000) | (54,401,000) | (2,724,000) | (2,531,000) | (8,180,000) | (7,614,000) |  |  |  |  |  |  | (18,167,000) | (16,138,000) | (54,496,000) | (48,413,000) | (2,684,000) | (2,502,000) | (8,054,000) | (7,502,000)
Amortization of prior service gain |  |  |  | 22,000 | (24,000) | 66,000 | (73,000) | (448,000) | (448,000) | (1,345,000) | (1,345,000) |  |  |  |  |  |  | 15,000 | (116,000) | 46,000 | (348,000) | (451,000) | (451,000) | (1,353,000) | (1,353,000)
Amortization of net actuarial loss |  |  |  | 5,064,000 | 9,560,000 | 15,240,000 | 28,878,000 | (2,000) | 398,000 | (8,000) | 1,203,000 |  |  |  |  |  |  | 4,616,000 | 8,649,000 | 13,845,000 | 25,948,000 | 0 | 387,000 | 0 | 1,159,000
Net periodic benefit cost |  |  |  | 15,099,000 | 21,686,000 | 45,404,000 | 65,311,000 | (167,000) | 387,000 | (500,000) | 1,150,000 |  |  |  |  |  |  | 14,859,000 | 20,795,000 | 44,577,000 | 62,387,000 | (229,000) | 297,000 | (688,000) | 892,000
Impact of PUC D&Os |  |  |  | (3,331,000) | (9,257,000) | (9,993,000) | (28,847,000) | 494,000 | (332,000) | 1,482,000 | (1,018,000) |  |  |  |  |  |  | (3,331,000) | (9,257,000) | (9,993,000) | (28,847,000) | 494,000 | (332,000) | 1,482,000 | (1,018,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) |  |  |  | 11,768,000 | 12,429,000 | 35,411,000 | 36,464,000 | 327,000 | 55,000 | 982,000 | 132,000 |  |  |  |  |  |  | 11,528,000 | 11,538,000 | 34,584,000 | 33,540,000 | 265,000 | (35,000) | 794,000 | (126,000)
Retirement benefits expense | 24,000,000 | 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 | 21,000,000 |  |  |  |  |  |  |  |  |
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, expenses recognized | 3,400,000 | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 400,000 |  |  |  |  |  |  |  |  |
Cash contributions by the employer to defined contribution plan | $ 4,200,000 | $ 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 | $ 400,000 |  |  |  |  |  |  |  |  |

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- Definition Represents the total amount of net periodic benefit cost adjusted for impact of Public Utilities Commission's decisions and orders. + References No definition available. + Details
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- Definition Represents the number of years for which regulatory asset/liability for each utilities will be amortized, beginning with the respective utility's next rate case. + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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)(4) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2709-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) 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=28361610&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + 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)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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