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Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Commitments to extend credit |  |
Long-term Purchase Commitment |  |
Commitments | $ 82,736 | $ 80,680
Letters of credit |  |
Long-term Purchase Commitment |  |
Commitments | 2,102 | 1,952
Forward contracts related to residential mortgage loans measured at fair value |  |
Long-term Purchase Commitment |  |
Commitments | 1,412 | 881
Capital commitments for private equity investments |  |
Long-term Purchase Commitment |  |
Commitments | 258 | 219
Capital expenditures |  |
Long-term Purchase Commitment |  |
Commitments | 165 | 80
Purchase obligations |  |
Long-term Purchase Commitment |  |
Commitments | $ 6 | $ 27

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