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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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