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Background and Business Description Rehabilitation Exit Support Agreement (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Feb. 12, 2018
Cancellation of Surplus Notes and Accrued Interest |  |  |  | $ 552,320,000
Cancellation of Surplus Notes Accrued Interest |  |  |  | 257,200,000
SatisfactionAndDischargeOfSegregatedAccountDeferredAmounts |  |  |  | 3,856,992,000
Gain Contingency, Unrecorded Amount | $ 1,400,000,000 | $ 1,400,000,000 |  |
Market Value of Secured Note Collateral | 255,628,000 | 255,628,000 |  |
Tier 2 Notes |  |  |  | 240,000,000
Tier 2 Note Security in RMBS Litigation Settlement Proceeds |  |  |  | 1,600,000,000
One Time Interest Payment on Surplus Notes |  |  |  | 13,501,000
Successor [Member] |  |  |  |
Long-term debt | 2,796,389,000 | 2,796,389,000 | $ 991,696,000 |
Deferred Payment Obligation [Member] |  |  |  |
Discount Amount |  |  |  | 0.065
Surplus Notes [Member] |  |  |  |
Cash Payment Amount |  |  |  | 0.40
Payment Amount in New Secured Notes |  |  |  | 0.41
Payment Amount in Existing Surplus Notes |  |  |  | 0.125
Ambac LSNI Secured Note [Domain] |  |  |  |
AMBAC LSNI Secured Note |  |  |  | 2,154,332,000
Ambac Assurance Corporation [Member] | Successor [Member] |  |  |  |
Long-term debt | $ 2,796,389,000 | $ 2,796,389,000 | $ 991,696,000 |
Ambac Assurance [Member] |  |  |  |
Secured Notes Received from Ambac LSNI |  |  |  | 643,583,000
Ambac [Member] | Deferred Payment Obligation [Member] |  |  |  |
One Dollar Outstanding |  |  |  | 1.00
Payment Amount in New Secured Notes |  |  |  | 0.91
Discount Amount |  |  |  | 0.09
Afg [Member] |  |  |  |
Secured Notes Received from Ambac LSNI |  |  |  | 124,881,000
Ambac [Member] |  |  |  |
One Time Interest Payment on Surplus Notes |  |  |  | $ 2,618,000
5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member] | Successor [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.10% | 5.10% | 5.10% |
Debt Instruments Maturity Year | 2020 | 2020 | 2020 |
Ambac Note Post Exit From Rehabilitation [Member] | Ambac Assurance Corporation [Member] | Successor [Member] |  |  |  |
Long-term debt | $ 2,038,912,000 | $ 2,038,912,000 | $ 0 |

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