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Junior Surplus Notes issued by the Segregated Account of Ambac Assurance to Ambac upon Ambac's emergence from bankruptcy. These Junior Surplus notes will be includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations.

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Debt Instrument Principal Amount Subject To Reduction

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Debt Instruments Maturity Year

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Interest Rate on Ambac Note Post Exit From Rehabilitation

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Interest Rate on Securities Issued by Delaware Trust

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One Time Interest Payment on Surplus Notes

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- Definition

Tier 2 Note Security in RMBS Litigation Settlement Proceeds

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Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Long-Term Debt (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Aug. 03, 2018	Jun. 30, 2018	Feb. 12, 2018	May 01, 2013
Debt Instrument [Line Items]
Tier 2 Note Security in RMBS Litigation Settlement Proceeds									$ 1,600,000
Secured Debt		$ 0		$ 0		$ 73,993
One Time Interest Payment on Surplus Notes									13,501
AMPS Exchange Total Surplus Notes Issued							$ 212,740
Junior surplus note of Ambac Assurance Segregated Account										$ 350,000
5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		19.50%		19.50%
Debt Instrument, Face Amount		$ 367,512		$ 367,512		370,237
Ambac Note Post Exit From Rehabilitation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		7.60%		7.60%
Debt Instrument, Face Amount		$ 1,968,614		$ 1,968,614
Repayments of Debt				$ 185,738
Tier 2 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.50%		8.50%
Tier 2 Note Security in RMBS Litigation Settlement Proceeds		$ 1,600,000		$ 1,600,000
Debt Instrument, Interest Rate, Effective Percentage		9.90%		9.90%
Paid-in-Kind Interest				$ 13,204
Debt Instrument, Face Amount		$ 253,204		253,204
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 0		$ 0		73,993
5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		10.10%		10.10%
Debt Instrument Principal Amount Subject To Repurchase									463,624
Debt Instrument, Face Amount		$ 523,367		$ 523,367		754,811
One State Street [Member] \| 5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument Principal Amount Subject To Repurchase		2,530		2,530
Debt Instrument, Face Amount		$ 17,512		17,512		20,237
Extinguishment of Debt, Amount				$ 2,725	$ 2,881
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] \| 5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.40%		8.40%
Afg [Member]
Debt Instrument [Line Items]
AMPS Exchange Total Surplus Notes Issued							$ 19,440
Successor [Member]
Debt Instrument [Line Items]
Long-term debt		$ 2,937,771		$ 2,937,771		991,696
Net realized gains (losses) on extinguishment of debt		0	$ 0	3,121	$ 4,920
Successor [Member] \| Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Long-term debt		2,937,771		2,937,771		991,696
Secured Debt		0		0		73,993
Successor [Member] \| Ambac Assurance Corporation [Member] \| 5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt		249,597		249,597		249,036
Successor [Member] \| Ambac Assurance Corporation [Member] \| Ambac Note Post Exit From Rehabilitation [Member]
Debt Instrument [Line Items]
Long-term debt		1,968,614		1,968,614		0
Successor [Member] \| Ambac Assurance Corporation [Member] \| Tier 2 Notes [Member]
Debt Instrument [Line Items]
Long-term debt		245,667		245,667		0
Successor [Member] \| Ambac Assurance Corporation [Member] \| 5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt		$ 473,893		$ 473,893		668,667
Successor [Member] \| Variable Interest Entity [Member]
Debt Instrument [Line Items]
Long-term debt						$ 12,160,544
Successor [Member] \| 5.1% Junior Surplus Notes, General Account Due 2020 [Member] \| Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.10%		5.10%		5.10%
Debt Instruments Maturity Year				2020		2020
Successor [Member] \| 5.1% Surplus Notes, General Account, Due 2020 [Member] \| Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.10%		5.10%		5.10%		5.10%
Debt Instruments Maturity Year				2020		2020
Variable Interest Entity, Primary Beneficiary [Member] \| Successor [Member]
Debt Instrument [Line Items]
Long-term debt		$ 5,585,860		$ 5,585,860		$ 12,160,544
Consolidated Variable Interest Entities [Member]
Debt Instrument [Line Items]
Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option		4,831,033		4,831,033		$ 9,387,884
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		397,201		397,201
Long-term Debt, Maturities, Repayments of Principal in Year Two		0		0
Long-term Debt, Maturities, Repayments of Principal in Year Three		0		0
Long-term Debt, Maturities, Repayments of Principal in Year Four		0		0
Long-term Debt, Maturities, Repayments of Principal in Year Five		$ 0		$ 0
Consolidated Variable Interest Entities [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		1.25%		1.25%		0.96%
Consolidated Variable Interest Entities [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.35%		8.35%		8.35%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate on Ambac Note Post Exit From Rehabilitation				5.00%
Interest Rate on Securities Issued by Delaware Trust	2.80%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest Rate on Ambac Note Post Exit From Rehabilitation				1.00%
Ambac [Member]
Debt Instrument [Line Items]
One Time Interest Payment on Surplus Notes									$ 2,618