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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Income Taxes (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Operating Loss Carryforwards | $ 3,454
Minimum [Member] |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030
Maximum [Member] |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2043
AFG [Member] |
Operating Loss Carryforwards | $ 1,630
Ambac Assurance [Member] |
Operating Loss Carryforwards | 1,824
Interest Expense | U. S. Federal Net Operating Tax [Member] |
Operating Loss Carryforwards | $ 314

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