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Debt (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	36 Months Ended
	Sep. 30, 2021	Jul. 05, 2023	Jul. 06, 2026	Dec. 31, 2020	Jun. 07, 2020
Debt Instrument [Line Items]
Long-term debt	$ 2,215			$ 2,739
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	780
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five	1,175
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	$ 366
Debt Instrument, Interest Rate, Effective Percentage	8.90%				10.10%
Rep & Warranty Subrogation Recoveries Up To	$ 1,400
Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	2,322			2,884
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(107)			(145)
Long-term debt	$ 2,215			2,739
Ambac Assurance Corporation [Member] | 5.1 Surplus Notes General Account Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.10%
Ambac Assurance Corporation [Member] | 5.1 Junior Surplus Notes General Account Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.10%
5.1 Junior Surplus Notes General Account Due 2020 | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 0			365
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0			(118)
Long-term debt	0			247
5.1 Surplus Notes General Account Due 2020
Debt Instrument [Line Items]
Aggregated Par Amount Reissued	249
5.1 Surplus Notes General Account Due 2020 | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	780			531
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(58)			0
Long-term debt	722			531
Ambac Note Post Exit From Rehabilitation [Member] | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	0			1,641
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0			0
Long-term debt	$ 0			1,641
Sitka AAC Note
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	5.70%
Debt Instrument, Redemption Price, Percentage			100.00%
Make Whole Percentage of Principal		103.00%	103.00%
Sitka AAC Note | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.50%
Sitka AAC Note | London Interbank Offered Rate (LIBOR) | Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	0.75%
Sitka AAC Note | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,175			0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(23)			0
Long-term debt	1,152			0
Tier 2 Notes | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	326			306
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0			0
Long-term debt	326			306
Secured Debt | Ambac UK [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	41			41
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(26)			(27)
Long-term debt	$ 14			$ 14

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