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Cash flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental disclosures of cash flow information |  |  |
Interest paid to non-affiliates, net of amounts capitalized | $ 98 | $ 98 | $ 107
Income taxes paid (net of refundable credits) | 41 | 32 | 56
Income taxes refunded (including refundable credits) | 7 | 3 | 4
Supplemental disclosures of noncash activities |  |  |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) | 48 | 44 | 64
Loans transferred from held for investment to held for sale (investing) | 61 | 0 | 0
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) | 3 | 0 | 0
Right-of-use assets obtained in exchange for operating lease obligations (investing) | 44 | 26 | 7
Common stock issued (gross) for director and executive/management compensation (financing) | 7 | 16 | 5
Obligations to fund low income housing investments, net (investing) | 36 | 25 | 11
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Supplemental disclosures of cash flow information |  |  |
Interest paid to non-affiliates, net of amounts capitalized | 71 | 65 | 68
Income taxes paid (net of refundable credits) | 45 | 41 | 55
Income taxes refunded (including refundable credits) | 5 | 3 | 4
Supplemental disclosures of noncash activities |  |  |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) | 43 | 41 | 62
Right-of-use assets obtained in exchange for operating lease obligations (investing) | 44 | 17 | 2
Electric utility property, plant and equipment |  |  |
Estimated fair value of noncash contributions in aid of construction (investing) | 8 | 10 | 9
Reduction of long-term debt from funds previously transferred for repayment (financing) | $ 0 | $ 82 | $ 0

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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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