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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 87 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2018 | Dec. 31, 2011
Net Income Loss Reconciliation [Line Items] |  |  |  |
AACNetTaxableIncome |  |  | $ 1,508 |
Remaining Net Operating Loss Carryforward, Amount |  |  | $ 2,142 |
Tolling Payment Payable to AFG, Gross |  | $ 28 |  |
NOL allocated amount |  |  |  | $ 3,650
Tier C Tolling Payments Payable to IRS |  | 12.50% |  |
Tier D Tolling Payments Payable to IRS |  | 17.50% |  |
Ambac Assurance [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
AACNetTaxableIncome |  | $ 197 |  |
NOL allocated amount |  | 2,482 |  |
Operating Loss Generated in Current Year | $ 143 |  |  |
Afg [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | 1,249 |  |
Operating Loss Generated in Current Year |  | 196 |  |
Tier A [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | $ 479 |  |
NOL applicable percentage |  | 15.00% |  |
Tier B [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | $ 1,057 |  |
NOL applicable percentage |  | 40.00% |  |
Tier C [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | $ 1,057 |  |
NOL applicable percentage |  | 10.00% |  |
Tier D [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | $ 1,057 |  |
NOL applicable percentage |  | 15.00% |  |
Domestic Tax Authority [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
NOL allocated amount |  | $ 3,731 |  |
Minimum [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |  |
Maximum [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2040 |  |

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