Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details) $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)
Financial Guarantee Insurance Product Line
Earnings of Deferred Premium Revenue
2025 (January 1 - March 31)	$ 76
2025 (April 1 - June 30)	75
2025 (July 1 - September 30)	74
2025 (October 1 - December 31)	72
Subtotal 2025	297
2026	275
2027	259
2028	246
2029	227
2030-2034	917
2035-2039	597
2040-2044	389
2045-2049	259
2050-2054	137
After 2054	109
Total	3,712
Accretion of Discount
2025 (January 1 - March 31)	9
2025 (April 1 - June 30)	9
2025 (July 1 - September 30)	9
2025 (October 1 - December 31)	8
Subtotal 2025	35
2026	33
2027	31
2028	29
2029	27
2030-2034	115
2035-2039	84
2040-2044	55
2045-2049	32
2050-2054	15
After 2054	12
Accretion of discount, net of commissions on assumed business	468
Total
2025 (January 1 - March 31)	85
2025 (April 1 - June 30)	84
2025 (July 1 - September 30)	83
2025 (October 1 - December 31)	80
Subtotal 2025	332
2026	308
2027	290
2028	275
2029	254
2030-2034	1,032
2035-2039	681
2040-2044	444
2045-2049	291
2050-2054	152
After 2054	121
Total	4,180
Consolidated Entity Excluding Variable Interest Entities (VIE)
Future Premiums to be Collected [Abstract]
2025 (January 1 - March 31)	69
2025 (April 1 - June 30)	48
2025 (July 1 - September 30)	33
2025 (October 1 - December 31)	38
Subtotal 2025	188
2026	125
2027	119
2028	113
2029	100
2030-2034	407
2035-2039	312
2040-2044	239
2045-2049	182
2050-2054	113
After 2054	121
Total	$ 2,019

Earnings Of Deferred Premium Revenue, Net

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 15 Through 20

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 20 Through 25

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 25 Through 30

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 30 Through 35

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 5 Through 10

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Second Quarter

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Third Quarter

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Year Five

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Year Four

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Year Three

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Year Two

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Financial Guarantee Insurance Contracts, Future Expected Premium Revenue to be Recognized, Fiscal Year

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Financial Guarantee Insurance Contracts, Future Expected Premium Revenue to be Recognized, Net, Fiscal Year

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, First Quarter

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Fourth Quarter

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Second Quarter

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Third Quarter

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Total

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 10 Through 15

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 15 Through 20

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 20 Through 25

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 25 Through 30

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 30 Through 35

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year 5 Through 10

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year Five

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year Four

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year One

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year Three

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Financial Guarantee Insurance Contracts, Premiums Receivable, Adjustment, Accretion of Discount on Premium Receivable, Year Two

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Future Net Premiums to be Earned

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Future Premiums to be Collected

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Premiums Receivable Accretion Of Discount

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Amount of unearned premium revenue under contracts issued by an insurance entity that provide protection to the holder of a financial obligation from a financial loss in the event of a default.

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Amount of premium revenue under financial guarantee insurance contract to be recognized in next fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of premium revenue under financial guarantee insurance contract to be recognized in fourth fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in second fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in third fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in eleventh through fifteenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of premium revenue under financial guarantee insurance contract to be recognized in sixteenth through twentieth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in twenty-first through twenty-fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in twenty-sixth through thirtieth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in thirty-first through thirty-fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium revenue under financial guarantee insurance contract to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium receivable under financial guarantee insurance contract to be collected in next fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of premium receivable under financial guarantee insurance contract to be collected in second fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium receivable under financial guarantee insurance contract to be collected in third fiscal quarter following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium receivable under financial guarantee insurance contract to be collected in eleventh through fifteenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of premium receivable under financial guarantee insurance contract to be collected in sixteenth through twentieth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of premium receivable under financial guarantee insurance contract to be collected in twenty-first through twenty-fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in twenty-sixth through thirtieth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in thirty-first through thirty-fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of premium receivable under financial guarantee insurance contract to be collected in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-3

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- Definition

Amount of premium receivables under financial guarantee insurance contracts.

+ References

No definition available.

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