v3.25.4
Fair Value Measurements, Fair Value Estimates for Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial assets    
Cash and due from banks $ 39,182 $ 37,080
Interest-earning deposits with banks 135,028 166,281
Held-to-maturity debt securities 175,797 193,779
Carrying value [Member]    
Financial assets    
Cash and due from banks 39,182 37,080
Interest-earning deposits with banks 135,028 166,281
Federal funds sold and securities borrowed or purchased under resale agreements 193,929 105,330
Held-to-maturity debt securities 208,023 234,948
Loans held for sale 2,618 1,547
Loans, net 957,037 882,361
Equity securities (cost method) 4,323 3,782
Total financial assets 1,540,140 1,431,329
Financial liabilities    
Deposits 166,686 139,547
Federal funds purchased and securities loaned or sold under repurchase agreements 232,687 95,235
Short-term borrowings 18,323 2,704
Long-term debt 167,618 169,567
Total financial liabilities 585,314 407,053
Fair Value Disclosures, Textual [Abstract]    
Lease financing, net 16,400 16,200
Deposit liabilities with no defined or contractual maturity 1,300,000 1,200,000
Finance lease obligations 12 16
Estimated fair value [Member]    
Financial assets    
Cash and due from banks 39,182 37,080
Interest-earning deposits with banks 135,028 166,281
Federal funds sold and securities borrowed or purchased under resale agreements 193,929 105,330
Held-to-maturity debt securities 175,797 193,779
Loans held for sale 2,681 1,600
Loans, net 931,928 848,227
Equity securities (cost method) 4,415 3,868
Total financial assets 1,482,960 1,356,165
Financial liabilities    
Deposits 166,107 139,189
Federal funds purchased and securities loaned or sold under repurchase agreements 232,687 95,235
Short-term borrowings 18,331 2,710
Long-term debt 173,953 174,081
Total financial liabilities 591,078 411,215
Fair Value Disclosures, Textual [Abstract]    
Loan commitments and standby, commercial and similar letters of credit 639 546
Estimated fair value [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Cash and due from banks 39,182 37,080
Interest-earning deposits with banks 134,695 165,903
Federal funds sold and securities borrowed or purchased under resale agreements 0 0
Held-to-maturity debt securities 2,051 2,015
Loans held for sale 0 0
Loans, net 0 0
Equity securities (cost method) 0 0
Total financial assets 175,928 204,998
Financial liabilities    
Deposits 0 0
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Total financial liabilities 0 0
Estimated fair value [Member] | Fair value, inputs, level 2 [Member]    
Financial assets    
Cash and due from banks 0 0
Interest-earning deposits with banks 333 378
Federal funds sold and securities borrowed or purchased under resale agreements 193,929 105,330
Held-to-maturity debt securities 170,490 188,756
Loans held for sale 2,418 1,216
Loans, net 820 3,211
Equity securities (cost method) 0 0
Total financial assets 367,990 298,891
Financial liabilities    
Deposits 75,728 63,497
Federal funds purchased and securities loaned or sold under repurchase agreements 232,687 95,235
Short-term borrowings 18,331 2,710
Long-term debt 172,563 171,747
Total financial liabilities 499,309 333,189
Estimated fair value [Member] | Fair value, inputs, level 3 [Member]    
Financial assets    
Cash and due from banks 0 0
Interest-earning deposits with banks 0 0
Federal funds sold and securities borrowed or purchased under resale agreements 0 0
Held-to-maturity debt securities 3,256 3,008
Loans held for sale 263 384
Loans, net 931,108 845,016
Equity securities (cost method) 4,415 3,868
Total financial assets 939,042 852,276
Financial liabilities    
Deposits 90,379 75,692
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0
Short-term borrowings 0 0
Long-term debt 1,390 2,334
Total financial liabilities $ 91,769 $ 78,026