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Summary of significant accounting policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Future minimum lease payments |  |  |
2015 | $ 17 |  |
2016 | 15 |  |
2017 | 12 |  |
2018 | 9 |  |
2019 | 7 |  |
Thereafter | 23 |  |
Total | 83 |  |
Leases |  |  |
Operating lease expense | $ 19 | $ 19 | $ 19
Composite annual depreciation rate (as a percent) | 3.10% | 3.10% | 3.10%
Maximum |  |  |
Cash and cash equivalents |  |  |
Original maturity period of investments classified as cash equivalents | 3 months |  |
Equity method |  |  |
Ownership percentage of affiliates classified as equity method investments | 50.00% |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Future minimum lease payments |  |  |
2015 | $ 8 |  |
2016 | 6 |  |
2017 | 5 |  |
2018 | 4 |  |
2019 | 3 |  |
Thereafter | 14 |  |
Total | 40 |  |
Leases |  |  |
Operating lease expense | $ 9 | $ 8 | $ 8

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