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Cash flows (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Supplemental disclosures of cash flow information |  |
Interest paid to non-affiliates | $ 45 | $ 46
Income taxes paid (including refundable credits) | 36 | 21
Supplemental disclosures of noncash activities |  |
Estimated fair value of noncash contributions in aid of construction (investing) | 5 | 2
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) | 42 | 38
Loans transferred from held for investment to held for sale (investing) | 1 | 9
Common stock issued (gross) for director and executive/management compensation (financing) | 4 | 11
Obligations to fund low income housing investments (investing) | 6 | 0
Transfer of retail repurchase agreements to deposit liabilities (financing) | 102 | 0
Unsettled trades to purchase investment securities (investing) | 10 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Supplemental disclosures of cash flow information |  |
Interest paid to non-affiliates | 32 | 36
Income taxes paid (including refundable credits) | 35 | 8
Supplemental disclosures of noncash activities |  |
Estimated fair value of noncash contributions in aid of construction (investing) | 5 | 2
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) | $ 28 | $ 36

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- Definition Noncash (or part noncash) increases in property, plant and equipment due to noncash contributions in aid of construction. + References No definition available. + Details
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- Definition Amount of expense for Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932. + References No definition available. + Details
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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