Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Weighted-average common shares used in basic earnings (loss) per share calculations (in shares)	409.0	433.9	468.8
Potentially dilutive securities:
Performance stock units, restricted stock units and other equity-based awards (in shares)	5.0	5.5	6.1
Weighted-average common shares used in diluted earnings (loss) per share calculations (in shares)	414.0	439.4	474.9
Income (loss) from continuing operations:
Income (loss) from continuing operations	$ 349	$ 437	$ 199
Less: net income (loss) from continuing operations attributable to noncontrolling interests	127	128	123
Income (loss) from continuing operations available to Genworth Financial, Inc.’s common stockholders	$ 222	$ 309	$ 76
Basic (in dollars per share)	$ 0.54	$ 0.71	$ 0.16
Diluted (in dollars per share)	$ 0.54	$ 0.70	$ 0.16
Income (loss) from discontinued operations:
Income (loss) from discontinued operations, net of taxes	$ 1	$ (10)	$ 0
Basic per share (in usd per share)	$ 0	$ (0.02)	$ 0
Diluted per share (in usd per share)	$ 0	$ (0.02)	$ 0
Net income (loss):
Income (loss) from continuing operations	$ 349	$ 437	$ 199
Income (loss) from discontinued operations, net of taxes	1	(10)	0
Net income (loss)	350	427	199
Less: net income (loss) attributable to noncontrolling interests	127	128	123
Net income (loss) available to Genworth Financial, Inc.’s common stockholders	$ 223	$ 299	$ 76
Basic (in dollars per share)	$ 0.54	$ 0.69	$ 0.16
Diluted (in dollars per share)	$ 0.54	$ 0.68	$ 0.16