Summary of Net Operating Income (Loss) for Segments and Corporate and Growth (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Pre-tax gain (loss) on early extinguishment of debt	[1]	$ 0	$ (1)	$ 1	$ (4)
Genworth Holdings | Senior Notes 2024
Segment Reporting Information [Line Items]
Aggregate principal amount of notes repurchased		48	130	48	130
Pre-tax gain (loss) on early extinguishment of debt			(1)		(4)
Genworth Holdings | Senior Notes 2034
Segment Reporting Information [Line Items]
Aggregate principal amount of notes repurchased		11		11
Pre-tax gain (loss) on early extinguishment of debt				1
Net Investment (Gains) Losses
Segment Reporting Information [Line Items]
Adjustment for portion of net investment gains (losses) attributable to noncontrolling interests		(2)		(2)
Changes in fair value of market risk benefits and associated hedges
Segment Reporting Information [Line Items]
Adjustment for changes in reserves, attributed fees and benefit payments		$ (4)	$ (12)	$ (7)	$ (25)

[1] During the six months ended June 30, 2023, we repurchased $11 million principal amount of Genworth Holdings’ senior notes due in June 2034 for a pre-tax gain of $1 million. During the three and six months ended June 30, 2022, we repurchased $48 million and $130 million, respectively, principal amount of Genworth Holdings’ senior notes due in February 2024 for a pre-tax loss of $1 million and $4 million, respectively.