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Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Commitments to extend credit |  |
Long-term Purchase Commitment |  |
Commitments | $ 114,164 | $ 84,405
Letters of credit |  |
Long-term Purchase Commitment |  |
Commitments | 6,248 | 2,095
Forward contracts related to residential mortgage loans measured at fair value |  |
Long-term Purchase Commitment |  |
Commitments | 1,021 | 1,072
Capital commitments for private equity investments |  |
Long-term Purchase Commitment |  |
Commitments | 354 | 310
Capital expenditures |  |
Long-term Purchase Commitment |  |
Commitments | $ 223 | $ 147

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