Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 223	$ 299	$ 76
Other comprehensive income (loss), net of taxes:
Net unrealized gains (losses) on securities without an allowance for credit losses	1,205	(1,017)	1,305
Net unrealized gains (losses) on securities with an allowance for credit losses	(2)	(5)	0
Derivatives qualifying as hedges	(305)	(518)	(190)
Change in the discount rate used to measure future policy benefits	(559)	2,462	(1,036)
Change in instrument-specific credit risk of market risk benefits	1	3	2
Foreign currency translation and other adjustments	12	(8)	6
Total comprehensive income (loss) available to Genworth Financial, Inc.’s common stockholders	542	1,212	135
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	223	299	76
Other comprehensive income (loss), net of taxes:
Net unrealized gains (losses) on securities without an allowance for credit losses	1,171	(1,021)	1,277
Net unrealized gains (losses) on securities with an allowance for credit losses	(2)	(5)	0
Derivatives qualifying as hedges	(305)	(518)	(190)
Change in the discount rate used to measure future policy benefits	(559)	2,462	(1,036)
Change in instrument-specific credit risk of market risk benefits	1	3	2
Foreign currency translation and other adjustments	13	(8)	6
Total other comprehensive income (loss)	319	913	59
Total comprehensive income (loss) available to Genworth Financial, Inc.’s common stockholders	$ 542	$ 1,212	$ 135