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Retirement benefits (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2011 | Jun. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Pension benefits | Jun. 30, 2010 Hawaiian Electric Company, Inc. and Subsidiaries Pension benefits | Jun. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Pension benefits | Jun. 30, 2010 Hawaiian Electric Company, Inc. and Subsidiaries Pension benefits | Jun. 30, 2011 Pension benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2010 Pension benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2011 Pension benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2010 Pension benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Other benefits | Jun. 30, 2010 Hawaiian Electric Company, Inc. and Subsidiaries Other benefits | Jun. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Other benefits | Jun. 30, 2010 Hawaiian Electric Company, Inc. and Subsidiaries Other benefits | Jun. 30, 2011 Other benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2010 Other benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2011 Other benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2010 Other benefits Hawaiian Electric Industries, Inc. | Jun. 30, 2011 Bank | Jun. 30, 2010 Bank | Jun. 30, 2011 Hawaiian Electric Industries, Inc. | Jun. 30, 2010 Hawaiian Electric Industries, Inc. | Dec. 31, 2010 Hawaiian Electric Industries, Inc. | Jun. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Jun. 30, 2010 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2010 Hawaiian Electric Company, Inc. and Subsidiaries
Defined benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer's additional matching contribution on the first 6 percent of employee deferrals (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of participant deferrals eligible for Employer contribution match, towards defined contribution plan (as a percent) | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions made to defined benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 400,000 | $ 1,000,000 | $ 37,000,000 | $ 16,000,000 | $ 31,000,000
Current estimate of contributions to defined benefit plans in current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  | 73,000,000 |  |
Benefits expected to be paid directly by the company in current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  | 1,000,000 |  |
Service cost |  | 8,474,000 | 6,772,000 | 17,039,000 | 13,382,000 | 8,824,000 | 7,095,000 | 17,741,000 | 14,048,000 | 1,129,000 | 1,131,000 | 2,352,000 | 2,219,000 | 1,173,000 | 1,168,000 | 2,440,000 | 2,291,000 |  |  |  |  |  |  |  |
Interest cost |  | 14,803,000 | 14,658,000 | 29,652,000 | 29,237,000 | 16,271,000 | 16,093,000 | 32,580,000 | 32,133,000 | 2,340,000 | 2,571,000 | 4,724,000 | 5,167,000 | 2,417,000 | 2,652,000 | 4,878,000 | 5,336,000 |  |  |  |  |  |  |  |
Expected return on plan assets |  | (15,352,000) | (15,353,000) | (30,636,000) | (30,677,000) | (17,172,000) | (17,221,000) | (34,273,000) | (34,415,000) | (2,618,000) | (2,728,000) | (5,226,000) | (5,443,000) | (2,657,000) | (2,766,000) | (5,305,000) | (5,518,000) |  |  |  |  |  |  |  |
Amortization of unrecognized transition obligations |  |  |  |  |  |  |  | 1,000 | 1,000 | (2,000) | (2,000) | (4,000) | (4,000) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service gain |  | (187,000) | (187,000) | (374,000) | (374,000) | (97,000) | (97,000) | (194,000) | (194,000) | (312,000) | (56,000) | (539,000) | (111,000) | (309,000) | (52,000) | (533,000) | (104,000) |  |  |  |  |  |  |  |
Recognized actuarial loss (gain) |  | 4,016,000 | 1,767,000 | 8,136,000 | 3,452,000 | 4,314,000 | 1,791,000 | 8,719,000 | 3,507,000 | 37,000 | 1,000 | 55,000 | 4,000 | 40,000 | (2,000) | 55,000 | (3,000) |  |  |  |  |  |  |  |
Net periodic benefit cost |  | 11,754,000 | 7,657,000 | 23,817,000 | 15,020,000 | 12,140,000 | 7,661,000 | 24,574,000 | 15,080,000 | 574,000 | 917,000 | 1,362,000 | 1,832,000 | 664,000 | 1,000,000 | 1,535,000 | 2,002,000 |  |  | 20,000,000 | 19,000,000 |  |  |  |
Impact of PUC DandOs |  | (556,000) | 2,020,000 | (2,100,000) | 5,028,000 | (556,000) | 2,020,000 | (2,100,000) | 5,028,000 | 1,734,000 | 1,333,000 | 2,752,000 | 2,621,000 | 1,734,000 | 1,333,000 | 2,752,000 | 2,621,000 |  |  |  |  |  |  |  |
Net periodic benefit cost (adjusted for impact of PUC DandOs) |  | 11,198,000 | 9,677,000 | 21,717,000 | 20,048,000 | 11,584,000 | 9,681,000 | 22,474,000 | 20,108,000 | 2,308,000 | 2,250,000 | 4,114,000 | 4,453,000 | 2,398,000 | 2,333,000 | 4,287,000 | 4,623,000 |  |  |  |  |  |  |  |
Retirement benefits expense |  | 11,754,000 | 7,657,000 | 23,817,000 | 15,020,000 | 12,140,000 | 7,661,000 | 24,574,000 | 15,080,000 | 574,000 | 917,000 | 1,362,000 | 1,832,000 | 664,000 | 1,000,000 | 1,535,000 | 2,002,000 |  |  | 20,000,000 | 19,000,000 |  |  |  |
Defined contribution plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, expenses recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 1,900,000 |  |  |  |  |  |
Cash contributions by the employer to defined contribution plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 | $ 2,800,000 |  |  |  |  |  |

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- Definition The employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + Details
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- Definition The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 -Topic 715 -SubTopic 30 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)(4) -URI http://asc.fasb.org/extlink&oid=6962843&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 a -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 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 -Topic 715 -SubTopic 60 Reference 5: 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 6: 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. + 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 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 2: 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=6962843&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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6962843&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 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 -Topic 715 -SubTopic 30 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 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 -Topic 715 -SubTopic 60 Reference 5: 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 6: 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. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6962843&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 (h)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: 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 4: 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 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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6962843&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)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: 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 4: 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 5: 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 6: 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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