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Retirement benefits (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined contribution plan |  |  |
Defined contribution plan, expenses recognized | $ 5,000,000 | $ 4,000,000 | $ 3,000,000
Cash contributions by the employer to defined contribution plan | 4,000,000 | 4,000,000 | 4,000,000
Hawaiian Electric Industries, Inc. |  |  |
Defined contribution plan |  |  |
Maximum percentage of participant deferrals eligible for Employer contribution match, towards defined contribution plan | 6.00% |  |
Employer's additional matching contribution on employee deferrals (as a percent) | 50.00% |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined contribution plan |  |  |
Maximum percentage of participant deferrals eligible for Employer contribution match, towards defined contribution plan | 6.00% |  |
Employer's additional matching contribution on employee deferrals (as a percent) | 50.00% |  |
Defined contribution plan, expenses recognized | 600,000 |  |
American Savings Bank (ASB) |  |  |
Defined contribution plan |  |  |
Maximum percentage of participant deferrals eligible for Employer contribution match, towards defined contribution plan | 4.00% |  |
Pension benefits |  |  |
Defined benefit plans |  |  |
Service cost | 56,405,000 | 43,221,000 | 35,016,000
Interest cost | 64,788,000 | 67,480,000 | 64,966,000
Expected return on plan assets | (72,537,000) | (71,183,000) | (68,901,000)
Amortization of net transition obligation | 0 | 1,000 | 2,000
Amortization of net prior service gain | (97,000) | (325,000) | (389,000)
Amortization of net actuarial loss (gain) | 38,438,000 | 25,675,000 | 16,987,000
Net periodic benefit cost | 86,997,000 | 64,869,000 | 47,681,000
Impact of PUC D&Os | (38,104,000) | (15,754,000) | (3,516,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 48,893,000 | 49,115,000 | 44,165,000
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2013 |  |  |
Prior service credit | 100,000 |  |
Net actuarial loss | (20,200,000) |  |
Net transition obligation | 0 |  |
Pension expense | 34,000,000 | 35,000,000 | 32,000,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 54,482,000 | 41,603,000 | 33,627,000
Interest cost | 59,119,000 | 61,453,000 | 59,077,000
Expected return on plan assets | (64,551,000) | (64,004,000) | (61,615,000)
Amortization of net prior service gain | (464,000) | (689,000) | (747,000)
Amortization of net actuarial loss (gain) | 34,597,000 | 23,428,000 | 15,752,000
Net periodic benefit cost | 83,183,000 | 61,791,000 | 46,094,000
Impact of PUC D&Os | (38,104,000) | (15,754,000) | (3,516,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 45,079,000 | 46,037,000 | 42,578,000
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2013 |  |  |
Prior service credit | 100,000 |  |
Net actuarial loss | (18,200,000) |  |
Net transition obligation | 0 |  |
Pension expense | 30,000,000 | 32,000,000 | 31,000,000
Other benefits |  |  |
Defined benefit plans |  |  |
Service cost | 4,306,000 | 4,211,000 | 4,409,000
Interest cost | 7,569,000 | 9,009,000 | 9,534,000
Expected return on plan assets | (10,147,000) | (10,336,000) | (10,650,000)
Amortization of net prior service gain | (1,793,000) | (1,793,000) | (1,494,000)
Amortization of net actuarial loss (gain) | 1,602,000 | 1,498,000 | 234,000
Net periodic benefit cost | 1,537,000 | 2,589,000 | 2,033,000
Impact of PUC D&Os | (1,458,000) | (2,227,000) | 2,674,000
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 79,000 | 362,000 | 4,707,000
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2013 |  |  |
Prior service credit | (1,800,000) |  |
Net actuarial loss | 0 |  |
Net transition obligation | 0 |  |
Postretirement benefits other than pension expense | 400,000 | 1,000,000 | 4,000,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased total service and interest cost | 300,000 |  |
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased the accumulated postretirement benefit obligation (APBO) | 4,500,000 |  |
Effect of one-percentage-point decrease that would have reduced total service and interest cost | (300,000) |  |
Effect of one-percentage-point decrease that would have reduced APBO | (4,900,000) |  |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 4,163,000 | 4,014,000 | 4,238,000
Interest cost | 7,288,000 | 8,703,000 | 9,228,000
Expected return on plan assets | (10,002,000) | (10,195,000) | (10,508,000)
Amortization of net transition obligation | 0 | (9,000) | (8,000)
Amortization of net prior service gain | (1,803,000) | (1,803,000) | (1,505,000)
Amortization of net actuarial loss (gain) | 1,544,000 | 1,455,000 | 212,000
Net periodic benefit cost | 1,190,000 | 2,165,000 | 1,657,000
Impact of PUC D&Os | (1,458,000) | (2,227,000) | 2,674,000
Net periodic benefit cost (adjusted for impact of PUC D&Os) | (268,000) | (62,000) | 4,331,000
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2013 |  |  |
Prior service credit | (1,800,000) |  |
Net actuarial loss | 0 |  |
Net transition obligation | 0 |  |
Postretirement benefits other than pension expense | 0 | 400,000 | 3,000,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased total service and interest cost | 300,000 |  |
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased the accumulated postretirement benefit obligation (APBO) | 4,500,000 |  |
Effect of one-percentage-point decrease that would have reduced total service and interest cost | (300,000) |  |
Effect of one-percentage-point decrease that would have reduced APBO | $ (4,800,000) |  |

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- Definition The amount of pension benefit costs recognized during the period for defined benefit plans. Pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments, less the impact of Public Utilities Commission decisions and orders and capitalized amounts. + References No definition available. + Details
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- Definition The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + 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 (s) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph s -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amounts in accumulated other comprehensive income related to transition assets (obligations), origination from the adoption of FAS 87 and 106, expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + 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 (s) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph s -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 5: 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 6: 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=21915506&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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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)(2) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 4: 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=21915506&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 6: 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=21915506&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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance. + 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=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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