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Fair Value Option - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value [Line Items] |  |  |  |  |
Total contractual amount of unfunded commitments for which the fair value option was elected | $ 1,620,000,000 |  | $ 1,620,000,000 |  | $ 568,000,000
Net gain/(loss) attributable to changes in instrument-specific credit spreads on loans and lending commitments for which the fair value option was elected | 0 | $ 0 | 0 | $ 0 |
Secured long term borrowings |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value | 0 |  | 0 |  | 0
Unsecured long-term borrowings |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value | $ 2,670,000,000 |  | $ 2,670,000,000 |  | $ 4,230,000,000

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- Definition Total contractual amount of unfunded commitments for which the fair value option was elected. + References No definition available. + Details
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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 + Details
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- Definition This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-30 + Details
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