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Investments - Internally Managed Investment Portfolio (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	$ 7,396	$ 8,202
Fixed-maturity securities, trading	87	0
Short-term investments, at fair value	863	1,225
Other invested assets	150	181
Total investments	8,496	9,608
Externally managed
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	5,894	6,843
Loss mitigation securities and other
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	735	818
AssuredIM managed
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	526	541
Recovery Bonds
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	$ 241	$ 0
BIG
Debt and Equity Securities, FV-NI [Line Items]
Fixed-maturity investments, non-investment grade, percent	7.40%	7.50%
Not Internally Rated
Debt and Equity Securities, FV-NI [Line Items]
Fixed-maturity investments, non-investment grade, percent	4.10%	0.90%
Equity method investments
Debt and Equity Securities, FV-NI [Line Items]
Other invested assets	$ 140	$ 169
Other
Debt and Equity Securities, FV-NI [Line Items]
Other invested assets	$ 10	$ 12

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Amount excluding accrued interest, of 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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