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CONDENSED PARENT COMPANY FINANCIAL STATEMENTS - Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities of continuing operations $ (67,632) $ (19,669) $ (73,416)
Cash flows from investing activities of continuing operations      
Net cash provided by (used in) investing activities of continuing operations (108,282) 86,250 (8,459)
Cash flows from financing activities of continuing operations      
Dividends paid (5,372) (5,199) (5,212)
Issuance of preferred stock 7,186 5,282 2,739
Redemption of preferred stock (5,000) (5,050) (4,145)
Treasury stock acquired [1] (13,250) (2,474) (1,977)
Net cash provided by (used in) financing activities of continuing operations 238,031 (38,304) 687
Change in cash, due from banks and deposits with banks 73,047 15,600 (81,093)
Cash, due from banks and deposits with banks at beginning of year 276,532 260,932 342,025
Cash, due from banks and deposits with banks at end of year 349,579 276,532 260,932
Cash and due from banks (including segregated cash and other deposits) 23,717 22,782 27,342
Deposits with banks, net of allowance 325,862 253,750 233,590
Cash, due from banks and deposits with banks at end of year 349,579 276,532 260,932
Supplemental disclosure of cash flow information for continuing operations      
Cash paid during the year for income taxes 6,514 5,798 5,727
Cash paid during the year for interest 80,983 88,027 72,989
Parent Company      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities of continuing operations 18,876 2,536 17,163
Cash flows from investing activities of continuing operations      
Changes in investments and advances—intercompany (7,849) (1,287) (3,450)
Net cash provided by (used in) investing activities of continuing operations (7,849) (1,287) (3,450)
Cash flows from financing activities of continuing operations      
Dividends paid (5,372) (5,199) (5,212)
Issuance of preferred stock 7,186 5,282 2,739
Redemption of preferred stock (5,000) (5,050) (4,145)
Treasury stock acquired (13,250) (2,474) (1,977)
Proceeds (repayments) from issuance of long-term debt, net 9,416 4,399 (6,955)
Net change in short-term borrowings and other advances—intercompany (661) 3,250 2,162
Other financing activities (780) (454) (329)
Net cash provided by (used in) financing activities of continuing operations (8,461) (246) (13,717)
Change in cash, due from banks and deposits with banks 2,566 1,003 (4)
Cash, due from banks and deposits with banks at beginning of year 4,014 3,011 3,015
Cash, due from banks and deposits with banks at end of year 6,580 4,014 3,011
Cash and due from banks (including segregated cash and other deposits) 5 14 11
Deposits with banks, net of allowance   4,000 3,000
Cash, due from banks and deposits with banks at end of year 6,580 4,014 3,011
Supplemental disclosure of cash flow information for continuing operations      
Cash paid during the year for interest $ 6,228 $ 5,934 $ 5,704
[1] Balances based on transaction date.