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Loans - Summary of Estimated Fair Value of Loans and Lending Commitments that are not Accounted for at Fair Value (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | $ 222,379 | $ 196,200
Loans held for sale | 2,502 | 3,525
Reported Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans held for sale | 2,502 | 3,525
Level 2 | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans held for sale | 1,772 | 2,928
Level 3 | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans held for sale | 758 | 600
Total | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans held for sale | 2,530 | 3,528
Amortized Cost |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 214,379 | 187,215
Amortized Cost | Reported Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 214,379 | 187,215
Amortized Cost | Level 2 | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 110,254 | 99,790
Amortized Cost | Level 3 | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 106,095 | 89,540
Amortized Cost | Total | Estimate of Fair Value Measurement |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 216,349 | 189,330
Held For Sale |  |
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items] |  |
Loans | 2,502 | 3,525
Loans held for sale | $ 2,502 | $ 3,525

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- Definition Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477011/948-310-45-1 + Details
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