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Business and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Jul. 31, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Segment $ / shares shares | Jun. 30, 2023 USD ($) | Jul. 31, 2023 USD ($) | Apr. 01, 2013
Number of reportable segments | Segment |  |  |  | 3 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 350 |
Number of shares repurchased | shares |  |  |  | 15,964,736 |  |  |
Average price per share repurchased | $ / shares |  |  |  | $ 6.21 |  |  |
Treasury stock value acquired cost method |  | $ 37 | $ 114 | $ 100 | $ 183 |  |
Subsequent Event |  |  |  |  |  |  |
Number of shares repurchased | shares | 1,991,396 |  |  |  |  |  |
Average price per share repurchased | $ / shares | $ 6.03 |  |  |  |  |  |
Treasury stock value acquired cost method | $ 12 |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 230 |  |  |  |  |  |
Genworth Holdings |  |  |  |  |  |  |
Percentage of subsidiary equity ownership |  |  |  |  |  |  | 100.00%

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