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Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Net	$ 236,383	$ 233,258
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net	1,351	1,361
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement
Schedule of Insured Financial Obligations [Line Items]
Net	506	509
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | Puerto Rico Electric Power Authority
Schedule of Insured Financial Obligations [Line Items]
Net	720	720
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | Puerto Rico Transportation Authority
Schedule of Insured Financial Obligations [Line Items]
Net	295	298
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | Puerto Rico Highways Authority
Schedule of Insured Financial Obligations [Line Items]
Net	182	182
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | Commonwealth of Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net	25	25
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | PBA
Schedule of Insured Financial Obligations [Line Items]
Net	4	4
Puerto Rico | Other Puerto Rico Exposure
Schedule of Insured Financial Obligations [Line Items]
Net	125	132
Puerto Rico | Other Puerto Rico Exposure | MFA
Schedule of Insured Financial Obligations [Line Items]
Net	124	131
Puerto Rico | Other Puerto Rico Exposure | PRASA and U of PR
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1	$ 1

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- Definition

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

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- Definition

[Line Items] for Schedule of Insured Financial Obligations [Table]

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