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Outstanding Exposure - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2021	Dec. 31, 2022	Mar. 01, 2023	Mar. 15, 2022	Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]
Loss Mitigation Securities and other		$ 1,300			$ 1,300
Net Par Outstanding		233,258			236,392
Gross Exposure		1,700
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		1,361			3,572
Puerto Rico | Net Exposure | PRCCDA and PRIFA
Schedule of Insured Financial Obligations [Line Items]
Cash received for bonds				$ 47
Notional amount of contingent value instrument received for bonds				$ 98
Puerto Rico | Net Exposure | GO and PBA POA
Schedule of Insured Financial Obligations [Line Items]
Amount of outstanding principal to be paid, percent	100.00%
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		509			2,643
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PREPA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		720			748
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | Commonwealth of Puerto Rico - GO
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		25			1,097
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | GO/PBA PSA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		29
Cash received net of outbound reinsurance		530
Recovery bonds received, net		605
Contingent value instruments received, net		258
Net par outstanding, portion of noncallable insured bonds					102
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PBA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		4			122
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PRHTA (Transportation revenue)
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		298			799
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PRHTA (Highway revenue)
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		182			457
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PRCCDA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		0			152
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PRIFA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		0			16
Puerto Rico | Puerto Rico Highways and Transportation Authority
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		480
Cash received		251
Recovery bonds received, net		807
Notional amount of contingent value instrument received		672
Puerto Rico | Other Puerto Rico Exposures
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		852			929
Puerto Rico | Other Puerto Rico Exposures | MFA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		131			179
Puerto Rico | Other Puerto Rico Exposures | MFA | Subsequent Event
Schedule of Insured Financial Obligations [Line Items]
Debt service payments			$ 132
Public finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		224,099			227,164
Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		9,159			9,228
Commitment to Provide Guarantees | Public finance
Schedule of Insured Financial Obligations [Line Items]
Outstanding commitments to provide guaranties		220
Commitment to Provide Guarantees | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Outstanding commitments to provide guaranties		$ 792
BIG
Schedule of Insured Financial Obligations [Line Items]
Maximum period of liquidity claims (in years)		1 year
Net Par Outstanding		$ 5,892			7,356
Gross Exposure		144			144
Net Exposure		84			84
BIG | Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Change in net par outstanding		2,200
Net Par Outstanding		1,400			3,600
BIG | Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement
Schedule of Insured Financial Obligations [Line Items]
Change in net par outstanding		2,000
BIG | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		4,777			5,972
BIG | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding		$ 1,115			$ 1,384
Minimum
Schedule of Insured Financial Obligations [Line Items]
Probability of paying more claims than being reimbursed (as a percent)		50.00%

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- Definition

Represents the outstanding principal amounts of the securities insured and purchased by the Company, and for which it has expected losses to be paid, in order to mitigate the economic effect of insured losses ("loss mitigation securities").

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Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, after netting out ceded contracts.

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Probability that, on a present value basis, the entity will pay more claims over the life of that transaction than it will ultimately have been reimbursed.

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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