v3.26.1
Fair Value - Schedule of Reported and Estimated Fair Values of Financial Assets and Liabilities Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financial Assets:    
Cash and due from banks $ 4,290 $ 4,433
Interest-bearing deposits with banks 145,223 126,930
Securities purchased under resale agreements 9,035 6,812
Investment securities held-to-maturity 31,104 34,166
Other 1,029 854
Financial Liabilities:    
Non-interest-bearing 46,489 35,267
Interest-bearing - U.S. 191,759 168,079
Interest-bearing - non-U.S. 81,299 71,004
Securities sold under repurchase agreements 395 841
Other short-term borrowings 4,372 3,821
Quoted Market Prices in Active Markets (Level 1)    
Financial Assets:    
Other 18 22
Pricing Methods with Significant Observable Market Inputs (Level 2)    
Financial Assets:    
Net loans 92 92
Other 1,011 832
Pricing Methods with Significant Unobservable Market Inputs (Level 3)    
Financial Assets:    
Other 0 0
Carrying Value    
Financial Assets:    
Cash and due from banks 4,290 4,433
Interest-bearing deposits with banks 145,223 126,930
Securities purchased under resale agreements 9,035 6,812
Investment securities held-to-maturity 35,290 38,171
Net loans 51,901 46,589
Other 13,606 15,490
Financial Liabilities:    
Non-interest-bearing 46,489 35,267
Interest-bearing - U.S. 191,759 168,079
Interest-bearing - non-U.S. 81,299 71,004
Securities sold under repurchase agreements 395 841
Other short-term borrowings 4,372 3,821
Long-term debt 25,704 25,143
Other 13,606 15,490
Estimated Fair Value    
Financial Assets:    
Cash and due from banks 4,290 4,433
Interest-bearing deposits with banks 145,223 126,930
Securities purchased under resale agreements 9,035 6,812
Investment securities held-to-maturity 31,104 34,166
Net loans 51,750 46,417
Other 13,606 15,490
Financial Liabilities:    
Non-interest-bearing 46,489 35,267
Interest-bearing - U.S. 191,759 168,079
Interest-bearing - non-U.S. 81,299 71,004
Securities sold under repurchase agreements 395 841
Other short-term borrowings 4,372 3,821
Long-term debt 25,548 25,253
Other 13,606 15,490
Estimated Fair Value | Quoted Market Prices in Active Markets (Level 1)    
Financial Assets:    
Cash and due from banks 4,290 4,433
Interest-bearing deposits with banks 0 0
Securities purchased under resale agreements 0 0
Investment securities held-to-maturity 266 563
Net loans 0 0
Other 0 0
Financial Liabilities:    
Non-interest-bearing 0 0
Interest-bearing - U.S. 0 0
Interest-bearing - non-U.S. 0 0
Securities sold under repurchase agreements 0 0
Other short-term borrowings 0 0
Long-term debt 0 0
Other 0 0
Estimated Fair Value | Pricing Methods with Significant Observable Market Inputs (Level 2)    
Financial Assets:    
Cash and due from banks 0 0
Interest-bearing deposits with banks 145,223 126,930
Securities purchased under resale agreements 9,035 6,812
Investment securities held-to-maturity 30,838 33,603
Net loans 50,507 44,862
Other 13,606 15,490
Financial Liabilities:    
Non-interest-bearing 46,489 35,267
Interest-bearing - U.S. 191,759 168,079
Interest-bearing - non-U.S. 81,299 71,004
Securities sold under repurchase agreements 395 841
Other short-term borrowings 4,372 3,821
Long-term debt 25,411 25,130
Other 13,606 15,490
Estimated Fair Value | Pricing Methods with Significant Unobservable Market Inputs (Level 3)    
Financial Assets:    
Cash and due from banks 0 0
Interest-bearing deposits with banks 0 0
Securities purchased under resale agreements 0 0
Investment securities held-to-maturity 0 0
Net loans 1,243 1,555
Other 0 0
Financial Liabilities:    
Non-interest-bearing 0 0
Interest-bearing - U.S. 0 0
Interest-bearing - non-U.S. 0 0
Securities sold under repurchase agreements 0 0
Other short-term borrowings 0 0
Long-term debt 137 123
Other $ 0 $ 0