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Retirement benefits - Effects of Restatement (Details) (USD $) | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Retirement benefits expense | $ 8,000,000 | $ 10,000,000
As previously filed |  |
Retirement benefits expense |  | 11,000,000
Difference |  |
Retirement benefits expense |  | (1,000,000)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Retirement benefits expense | 8,000,000 | 9,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed |  |
Retirement benefits expense |  | 10,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Difference |  |
Retirement benefits expense |  | (1,000,000)
Pension benefits |  |
Impact of PUC D&Os | (3,011,000) | (8,866,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 11,830,000 | 13,039,000
Pension benefits | As previously filed |  |
Impact of PUC D&Os |  | (7,436,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) |  | 14,469,000
Pension benefits | Difference |  |
Impact of PUC D&Os |  | (1,430,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) |  | (1,430,000)
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Impact of PUC D&Os | (3,011,000) | (8,866,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 11,526,000 | 11,997,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed |  |
Impact of PUC D&Os |  | (7,436,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) |  | 13,427,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries | Difference |  |
Impact of PUC D&Os |  | (1,430,000)
Net periodic benefit cost (adjusted for impact of PUC D&Os) |  | $ (1,430,000)

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- Definition Represents the impact of Public Utilities Commission's decisions and orders on net periodic benefit cost. + References No definition available. + Details
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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 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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