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
	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