v3.26.1
Cover Page - shares
3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-32195  
Entity Registrant Name GENWORTH FINANCIAL, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 80-0873306  
Entity Address, Address Line One 11011 West Broad Street  
Entity Address, City or Town Glen Allen  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 23060  
City Area Code 804  
Local Phone Number 281-6000  
Title of 12(b) Security Common Stock, par value $.001 per share  
Trading Symbol GNW  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   383,009,256
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001276520