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Summary of significant accounting policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Future minimum lease payments |  |  |
2014 | $ 18 |  |
2015 | 16 |  |
2016 | 13 |  |
2017 | 10 |  |
2018 | 7 |  |
Thereafter | 29 |  |
Leases |  |  |
Operating lease expense | 19 | 19 | 14
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 |  |  |
2014 | 9 |  |
2015 | 8 |  |
2016 | 6 |  |
2017 | 5 |  |
2018 | 3 |  |
Thereafter | 18 |  |
Leases |  |  |
Operating lease expense | $ 8 | $ 8 | $ 6

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