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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Income Taxes (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended | 87 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards | $ 3,650 | $ 3,535 |
AACNetTaxableIncome |  |  | $ 1,508
Operating Loss Generated in Current Year |  | 143 |
AACNetTaxableIncomeFromTierB |  | 1,029 |
Tolling Payment Payable to AFG |  | 147 |
Tolling Payment to AFG |  | 119 |
TierABCCredit |  | (5) |
TierABCredit |  | (10) |
Tolling Payment Payable to AFG Outstanding Amount |  | $ 28 |
Minimum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |
Maximum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2040 |
AFG [Member] |  |  |
Operating Loss Carryforwards |  | $ 1,250 |
AFG [Member] | Minimum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |
AFG [Member] | Maximum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Jan. 01, 2034 |
Ambac Assurance [Member] |  |  |
Operating Loss Carryforwards |  | $ 2,285 |
Percentage Of Notional Federal Tax Liability | 25.00% |  |
Ambac Assurance [Member] | Minimum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |
Ambac Assurance [Member] | Maximum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2040 |
Tier B [Member] |  |  |
Operating Loss Carryforwards |  | $ 1,057 |

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