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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
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)

X

- 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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X

- Definition

This item represents net unrealized investment gains (losses) attributable to noncontrolling interests.

+ References

No definition available.

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X

- 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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X

- Definition

This item represents the increase (decrease) in net unrealized investment gains (losses) related to income taxes.

+ References

No definition available.

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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.

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X

- 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

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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

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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

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