Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details) $ in Millions	9 Months Ended
Sep. 30, 2025 USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE)
Future Premiums to be Collected [Abstract]
2025 (October 1 - December 31)	$ 60
2026	157
2027	131
2028	125
2029	113
2030-2034	439
2035-2039	346
2040-2044	266
2045-2049	201
2050-2054	123
After 2054	121
Total	2,082
Financial Guarantee Insurance Product Line
Earnings of Deferred Premium Revenue
2025 (October 1 - December 31)	78
2026	294
2027	272
2028	258
2029	240
2030-2034	954
2035-2039	627
2040-2044	414
2045-2049	275
2050-2054	142
After 2054	104
Total	3,658
Accretion of Discount
2025 (October 1 - December 31)	10
2026	37
2027	35
2028	33
2029	31
2030-2034	130
2035-2039	96
2040-2044	63
2045-2049	36
2050-2054	16
After 2054	12
Total	499
Total
2025 (October 1 - December 31)	88
2026	331
2027	307
2028	291
2029	271
2030-2034	1,084
2035-2039	723
2040-2044	477
2045-2049	311
2050-2054	158
After 2054	116
Total	$ 4,157

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 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, Fourth 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, Net

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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, Total

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- Definition

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 Three

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

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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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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-4

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-4

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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
-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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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
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-3

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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).

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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).

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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).

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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).

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Amount of premium receivables under financial guarantee insurance contracts.

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