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Cash flows (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Supplemental disclosures of cash flow information |  |  |
Interest paid to non-affiliates | $ 97,000,000 | $ 95,000,000 | $ 106,000,000
Income taxes paid/(refunded) | (22,000,000) | 6,000,000 | 21,000,000
Supplemental disclosures of noncash activities |  |  |
Common stock dividends reinvested in HEI common stock | 12,000,000 | 23,000,000 | 17,000,000
Increases in common stock issued under director and officer compensatory plans | 8,000,000 | 4,000,000 | 2,000,000
Electric utility property plant and equipment |  |  |
AFUDC-equity | 5,964,000 | 6,016,000 | 12,222,000
Estimated fair value of noncash contributions in aid of construction | 7,000,000 | 7,000,000 | 12,000,000
Unpaid invoices and other | 45,000,000 | 21,000,000 | 16,000,000
Loans transferred from held for investment to held for sale | 6,000,000 |  | 10,000,000
Real estate acquired in settlement of loans | $ 12,000,000 | $ 7,000,000 | $ 5,000,000

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- Definition The amount of real estate that the entity acquired in settlement of loans in noncash (or part noncash) transactions. Noncash is defined as an information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments during the period. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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