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Derivative Instruments and Hedging Activities - Fair Value Asset/(Liability) of Credit Protection Sold (Details) - Credit Protection Sold - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Credit Derivatives
Fair Value Asset (Liability)	$ 8,002	$ 3,896
CDS
Credit Derivatives
Fair Value Asset (Liability)	7,857	3,763
Single-name CDS
Credit Derivatives
Fair Value Asset (Liability)	3,137	2,475
Single-name CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	2,370	1,890
Single-name CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	767	585
Index and basket CDS
Credit Derivatives
Fair Value Asset (Liability)	4,720	1,288
Index and basket CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	883	799
Index and basket CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	3,837	489
Other credit contracts
Credit Derivatives
Fair Value Asset (Liability)	$ 145	$ 133

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Section 50
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-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4L

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
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Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
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-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

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