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Net Unrealized Gains and Losses on Available-for-Sale Investment Securities Reflected as Separate Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Components of Net Unrealized Investment Gains Losses Included in Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Net unrealized gains (losses) on fixed maturity securities without an allowance for credit losses | $ (3,765) |  | $ (2,577) |  |  |
Net unrealized gains (losses) on fixed maturity securities with an allowance for credit losses | 0 |  | 0 |  |  |
Adjustments to policyholder contract balances | 79 |  | 52 |  |  |
Income taxes, net | 600 |  | 352 |  |  |
Net unrealized investment gains (losses) | (3,086) |  | (2,173) |  |  |
Less: net unrealized investment gains (losses) attributable to noncontrolling interests | (44) |  | (43) |  |  |
Net unrealized investment gains (losses) attributable to Genworth Financial, Inc. | $ (3,042) | $ (2,615) | $ (2,130) | $ (3,056) | $ (2,500) | $ (3,407)

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of unsold securities at the end of an accounting period, including the portion attributable to noncontrolling interests. + References No definition available. + Details
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- Definition This item represents net unrealized investment gains (losses) attributable to noncontrolling interests. + References No definition available. + Details
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- Definition This item represents the increase (decrease) in unrealized investment gains (losses) related to policyholder contract balances. + References No definition available. + Details
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- Definition This item represents the increase (decrease) in net unrealized investment gains (losses) related to income taxes. + References No definition available. + Details
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- Definition Components of Net Unrealized Investment Gains Losses Included in Accumulated Other Comprehensive Income Loss [Line Items] + References No definition available. + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14 + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-2 + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-2 + Details
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