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Basis of presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | $ 669,984 | $ 561,712 | $ 1,850,447 | $ 1,638,015
Operating income | 98,064 | 111,473 | 248,752 | 259,013
Retirement defined benefits expense—other than service costs | (1,276) | (1,928) | (4,673) | (5,710)
Increase (decrease) in accounts, interest and dividends payable |  |  | (7,122) | 18,581
Net cash provided by operating activities |  |  | 257,679 | 320,114
Net cash used in investing activities |  |  | (541,761) | (469,330)
Capital expenditures |  |  | (404,984) | (343,375)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | 613,373 | 510,272 | 1,685,413 | 1,478,915
Operating income | 74,036 | 88,497 | 180,549 | 195,340
Retirement defined benefits expense—other than service costs | (682) | (1,421) | (2,934) | (4,279)
Other operation and maintenance | 113,553 | 98,681 | 333,805 | 302,437
Net cash provided by operating activities |  |  | 193,722 | 258,873
Net cash used in investing activities |  |  | (300,558) | (258,258)
Capital expenditures |  |  | (334,730) | (306,975)
Increase (decrease) in accounts payable |  |  | (8,712) | 6,130
Hawaiian Electric (parent only) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 366,394 |  | 1,054,570
Operating income |  | 62,873 |  | 131,954
Retirement defined benefits expense—other than service costs |  | (1,225) |  | (3,812)
Other operation and maintenance |  | 64,996 |  | 200,648
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 71,307 |  | 212,875
Operating income |  | 13,027 |  | 32,151
Retirement defined benefits expense—other than service costs |  | 15 |  | 183
Other operation and maintenance |  | 16,608 |  | 49,850
Maui Electric |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 72,571 |  | 211,470
Operating income |  | 12,627 |  | 31,286
Retirement defined benefits expense—other than service costs |  | (211) |  | (650)
Other operation and maintenance |  | 17,077 |  | 51,939
American Savings Bank (ASB) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | 53,232 | 47,313 | 153,951 | 146,146
Operating income | 27,264 | 26,976 | 79,068 | 76,328
Retirement defined benefits expense—other than service costs | 433 | 212 | 1,223 | 608
Compensation and employee benefits | 23,952 | 23,512 | 72,047 | 71,095
Other expense | 4,240 | 5,262 | 12,897 | 14,674
Electric utility |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | 613,373 | 510,272 | 1,685,413 | 1,478,915
Operating income | 74,036 | 88,497 | 180,549 | 195,340
Bank |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | 53,232 | 47,313 | 153,951 | 146,146
Operating income | 27,264 | 26,976 | 79,068 | 76,328
Other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses | 3,379 | 4,127 | 11,083 | 12,954
Operating income | $ (3,236) | (4,000) | $ (10,865) | (12,655)
As previously filed |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 563,640 |  | 1,643,725
Operating income |  | 109,545 |  | 253,303
Retirement defined benefits expense—other than service costs |  | 0 |  | 0
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 511,693 |  | 1,483,194
Operating income |  | 87,076 |  | 191,061
Retirement defined benefits expense—other than service costs |  | 0 |  | 0
Other operation and maintenance |  | 100,102 |  | 306,716
As previously filed | Hawaiian Electric (parent only) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 367,619 |  | 1,058,382
Operating income |  | 61,648 |  | 128,142
Retirement defined benefits expense—other than service costs |  | 0 |  | 0
Other operation and maintenance |  | 66,221 |  | 204,460
As previously filed | Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 71,292 |  | 212,692
Operating income |  | 13,042 |  | 32,334
Retirement defined benefits expense—other than service costs |  | 0 |  | 0
Other operation and maintenance |  | 16,593 |  | 49,667
As previously filed | Maui Electric |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 72,782 |  | 212,120
Operating income |  | 12,416 |  | 30,636
Retirement defined benefits expense—other than service costs |  | 0 |  | 0
Other operation and maintenance |  | 17,288 |  | 52,589
As previously filed | American Savings Bank (ASB) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Compensation and employee benefits |  | 23,724 |  | 71,703
Other expense |  | 5,050 |  | 14,066
As previously filed | Electric utility |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 511,693 |  | 1,483,194
Operating income |  | 87,076 |  | 191,061
As previously filed | Bank |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 47,525 |  | 146,754
Operating income |  | 26,764 |  | 75,720
As previously filed | Other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 4,422 |  | 13,777
Operating income |  | (4,295) |  | (13,478)
Adjustment | Hawaiian Electric (parent only) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase (decrease) in accounts, interest and dividends payable |  |  |  | 28,971
Net cash provided by operating activities |  |  |  | 28,971
Net cash used in investing activities |  |  |  | (28,971)
Capital expenditures |  |  |  | (28,971)
Increase (decrease) in accounts payable |  |  |  | 28,971
Adjustment | ASU 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (1,928) |  | (5,710)
Operating income |  | 1,928 |  | 5,710
Retirement defined benefits expense—other than service costs |  | (1,928) |  | (5,710)
Adjustment | ASU 2017-07 | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (1,421) |  | (4,279)
Operating income |  | 1,421 |  | 4,279
Retirement defined benefits expense—other than service costs |  | (1,421) |  | (4,279)
Other operation and maintenance |  | (1,421) |  | (4,279)
Adjustment | ASU 2017-07 | Hawaiian Electric (parent only) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (1,225) |  | (3,812)
Operating income |  | 1,225 |  | 3,812
Retirement defined benefits expense—other than service costs |  | (1,225) |  | (3,812)
Other operation and maintenance |  | (1,225) |  | (3,812)
Adjustment | ASU 2017-07 | Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | 15 |  | 183
Operating income |  | (15) |  | (183)
Retirement defined benefits expense—other than service costs |  | 15 |  | 183
Other operation and maintenance |  | 15 |  | 183
Adjustment | ASU 2017-07 | Maui Electric |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (211) |  | (650)
Operating income |  | 211 |  | 650
Retirement defined benefits expense—other than service costs |  | (211) |  | (650)
Other operation and maintenance |  | (211) |  | (650)
Adjustment | ASU 2017-07 | American Savings Bank (ASB) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Compensation and employee benefits |  | (212) |  | (608)
Other expense |  | 212 |  | 608
Adjustment | ASU 2017-07 | Electric utility |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (1,421) |  | (4,279)
Operating income |  | 1,421 |  | 4,279
Adjustment | ASU 2017-07 | Bank |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (212) |  | (608)
Operating income |  | 212 |  | 608
Adjustment | ASU 2017-07 | Other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Costs and expenses |  | (295) |  | (823)
Operating income |  | $ 295 |  | $ 823

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