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Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Commitments to extend credit    
Long-term Purchase Commitment    
Commitments $ 80,299 $ 81,570
Letters of credit    
Long-term Purchase Commitment    
Commitments 1,998 2,095
Forward contracts related to residential mortgage loans measured at fair value    
Long-term Purchase Commitment    
Commitments 1,040 650
Capital commitments for private equity investments    
Long-term Purchase Commitment    
Commitments 216 170
Capital expenditures    
Long-term Purchase Commitment    
Commitments 100 95
Purchase obligations    
Long-term Purchase Commitment    
Commitments $ 36 $ 69