| Document and Entity Information | Jul. 11, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | GENWORTH FINANCIAL INC |
| Amendment Flag | true |
| Entity Central Index Key | 0001276520 |
| Document Type | 8-K/A |
| Document Period End Date | Jul. 11, 2023 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-32195 |
| Entity Tax Identification Number | 80-0873306 |
| Entity Address, Address Line One | 6620 West Broad Street |
| Entity Address, City or Town | Richmond |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 23230 |
| City Area Code | (804) |
| Local Phone Number | 281-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $.001 per share |
| Trading Symbol | GNW |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | This current report on Form 8-K/A amends and supplements the current report on Form 8-K filed by Genworth Financial, Inc. (the “Company” or “Genworth”), with the U.S. Securities and Exchange Commission on July 11, 2023 (the “Original Form 8-K”). The Original Form 8-K, including the unaudited financial supplement, was furnished to reflect the adoption of long-duration targeted improvements (“LDTI”) and to assist investors and others in evaluating the impact of LDTI on the Company’s financial position and results of operations. This Form 8-K/A is being furnished to give effect to the revised accounting treatment applied by the Company in the second quarter of 2023, as described below. For all periods prior to the second quarter of 2023, the quarterly financial supplement furnished as Exhibit 99.1 with this Form 8-K/A replaces and supersedes the quarterly financial supplement previously furnished for the first quarter of 2023 in the Original Form 8-K. |
