Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Detail) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 768
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 53	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	400	41
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	53	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		810
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	106	16
Debt Securities Accumulated Gross Unrealized Loss Before Tax Included Pledged Securities		16
Debt Securities, Available for sale, Unrealized Loss Position, Including Pledged Securities	1,269	825
Debt Securities , Available for sale, Continuous Unrealized Loss Position,	869
Available-for-sale Securities	$ 1,966
Average Percentage Loss Versus Amortized Cost	10.00%
Average Percentage of Unrealized Loss Versus Amortized Cost for Below Investment Grade Securities	8.00%
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 78	114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8	13
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	86	128
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Available-for-sale Securities	$ 507	414
Ambac Insured Securities \| Parsed Fixed Income Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	5
Fixed Income Investments And Other Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	$ 1,902	2,145
Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	791	654
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	53	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	392	28
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	53	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,183	682
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	106	16
Available-for-sale Securities	1,395	1,730
Fixed Income Securities [Member] \| Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	21	117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	7	2
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	28	118
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	2	3
Available-for-sale Securities	43	340
Fixed Income Securities [Member] \| US Government Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	40	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	19	2
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	58	27
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	4	1
Available-for-sale Securities	65	45
Fixed Income Securities [Member] \| US Government Debt Securities [Member] \| Asset Pledged as Collateral [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		15
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments		0
Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than 12 Months Including Pledged Securities		783
Fixed Income Securities [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	280	363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	279	17
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	42	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	559	380
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 63	9
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	584
Available-for-sale Securities	$ 598	613
Fixed Income Securities [Member] \| Corporate Debt Securities [Member] \| External Credit Rating, Investment Grade
Debt Securities, Available-for-sale [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	61
Fixed Income Securities [Member] \| Corporate Debt Securities [Member] \| External Credit Rating, Non Investment Grade [Member]
Debt Securities, Available-for-sale [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	2
Fixed Income Securities [Member] \| Debt Security, Government, Non-US [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	27	75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	47	3
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	7	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	73	78
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	9	2
Available-for-sale Securities	76	87
Fixed Income Securities [Member] \| Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	132	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	19	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	1
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	132	2
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	19	0
Available-for-sale Securities	238	252
Fixed Income Securities [Member] \| Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	90	68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	36	3
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	126	71
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	4	0
Available-for-sale Securities	137	128
Fixed Income Securities [Member] \| Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	198	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	203	6
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 5	0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	14
Available-for-sale Securities	$ 224	265
Dbt Securities Available for Sale Unrealized Loss Measured as a Percent of Amortized Cost	2.00%
Fixed Income Securities [Member] \| Ambac Insured Securities
Debt Securities, Available-for-sale [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 18
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	13
Dbt Securities Available for Sale Unrealized Loss Measured as a Percent of Amortized Cost	15.00%
Fixed Income Securities [Member] \| Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3
Available-for-sale Securities	15
Fixed Income Securities [Member] \| Collateralized Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0
Collateral Pledged [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	64	120
Collateral Pledged [Member] \| Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	0	15
Collateral Pledged [Member] \| Fixed Income Securities [Member] \| Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	$ 64	$ 105

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Average Percentage of Unrealized Loss Versus Amortized Cost for Investment Grade Securities

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Debt Securities Accumulated Gross Unrealized Loss Before Tax Included Pledged Securities

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Debt Securities , Available for sale, Continuous Unrealized Loss Position, Less than 12 Months, Including Pledged Securities

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Debt Securities Available for Sale Unrealized Loss Measured as a Percent of Amortized Cost

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Debt Securities, Available for sale, Unrealized Loss Position, Including Pledged Securities

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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