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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, 2023 | Dec. 31, 2022
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Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturities, amortized cost | $ 28,568 | $ 24,191
Preferred stock, par or stated 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 or stated 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) | 74,200,000 | 69,900,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) | $ (99) | $ (250)
Treasury shares (in shares) | 30,800,000 | 30,800,000
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Fixed maturities, amortized cost | $ 0 | $ 0
Other invested assets, at cost | $ 38 | $ 0
Preferred stock, par or stated 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 or stated 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) | 74,200,000 | 69,900,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) | $ (99) | $ (250)
Treasury shares (in shares) | 30,800,000 | 30,800,000

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