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SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED BALANCE SHEETS (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Condensed Financial Statements, Captions [Line Items] |  |
Preferred stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 50,000,000.0 | 50,000,000.0
Preferred shares, issued (in shares) | 0 | 0
Preferred shares, outstanding (in shares) | 0 | 0
Common shares, par value per share (in dollars per share) | $ 0.01 | $ 0.01
Common shares, authorized (in shares) | 200,000,000.0 | 200,000,000.0
Common shares, outstanding (in shares) | 74,300,000 | 74,200,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) | $ (177) | $ (99)
Treasury shares (in shares) | 31,300,000 | 30,800,000
Cash | $ 1,549 | $ 1,437
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Other invested assets, at cost | $ 63 | $ 38
Preferred stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 50,000,000.0 | 50,000,000.0
Preferred shares, issued (in shares) | 0 | 0
Preferred shares, outstanding (in shares) | 0 | 0
Common shares, par value per share (in dollars per share) | $ 0.01 | $ 0.01
Common shares, authorized (in shares) | 200,000,000.0 | 200,000,000.0
Common shares, outstanding (in shares) | 74,300,000 | 74,200,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) | $ (177) | $ (99)
Treasury shares (in shares) | 31,300,000 | 30,800,000
Cash | $ 5 | $ 9

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