Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details) $ in Millions	3 Months Ended
Mar. 31, 2025 USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE)
Future Premiums to be Collected [Abstract]
2025 (April 1 - June 30)	$ 71
2025 (July 1 - September 30)	46
2025 (October 1 - December 31)	42
Subtotal 2025	159
2026	130
2027	123
2028	117
2029	106
2030-2034	417
2035-2039	319
2040-2044	244
2045-2049	185
2050-2054	115
After 2054	123
Total	2,038
Financial Guarantee Insurance Product Line
Earnings of Deferred Premium Revenue
2025 (April 1 - June 30)	76
2025 (July 1 - September 30)	75
2025 (October 1 - December 31)	73
Subtotal 2025	224
2026	278
2027	261
2028	248
2029	231
2030-2034	922
2035-2039	601
2040-2044	393
2045-2049	261
2050-2054	137
After 2054	109
Total	3,665
Accretion of Discount
2025 (April 1 - June 30)	9
2025 (July 1 - September 30)	9
2025 (October 1 - December 31)	9
Subtotal 2025	27
2026	34
2027	32
2028	30
2029	28
2030-2034	118
2035-2039	86
2040-2044	56
2045-2049	32
2050-2054	15
After 2054	12
Total	470
Total
2025 (April 1 - June 30)	85
2025 (July 1 - September 30)	84
2025 (October 1 - December 31)	82
Subtotal 2025	251
2026	312
2027	293
2028	278
2029	259
2030-2034	1,040
2035-2039	687
2040-2044	449
2045-2049	293
2050-2054	152
After 2054	121
Total	$ 4,135

Earnings Of Deferred Premium Revenue, Net

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, after Year 10 Through 15

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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 5 Through 10

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Financial Guarantee Insurance Contract, Premium Revenue to be Recognized, Net, Fourth 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

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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, Fourth 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 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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- Definition

Amount of unearned premium revenue in the statement of financial position for financial guaranty insurance contracts, net of the unexpired portion of premiums ceded and before adjustment for loss claims paid but not yet expensed.

+ References

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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 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).

+ 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 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).

+ 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 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 fourth fiscal quarter following current 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 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://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).

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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).

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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).

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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).

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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

+ Details

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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.

+ Details

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