v3.26.1
LOANS - Defaults of Modified Consumer Loans (Details) - Consumer loans - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
In North America offices    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification $ 111 $ 114
In North America offices | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 96 106
In North America offices | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 8 4
In North America offices | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
In North America offices | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 7 4
In North America offices | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
In North America offices | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
In offices outside North America    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 3 3
In offices outside North America | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 2 1
In offices outside North America | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
In offices outside North America | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 1
In offices outside North America | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 1 1
In offices outside North America | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
In offices outside North America | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In North America offices    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 14 7
Residential mortgages | In North America offices | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In North America offices | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 8 4
Residential mortgages | In North America offices | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In North America offices | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 6 3
Residential mortgages | In North America offices | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In North America offices | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In offices outside North America    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 1
Residential mortgages | In offices outside North America | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In offices outside North America | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In offices outside North America | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 1
Residential mortgages | In offices outside North America | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In offices outside North America | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Residential mortgages | In offices outside North America | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Home equity loans | In North America offices | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In North America offices    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 96 106
Total credit cards | In North America offices | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 96 106
Total credit cards | In North America offices | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In North America offices | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In North America offices | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In North America offices | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In North America offices | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In offices outside North America    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 2 1
Total credit cards | In offices outside North America | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 2 1
Total credit cards | In offices outside North America | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In offices outside North America | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In offices outside North America | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In offices outside North America | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Total credit cards | In offices outside North America | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In North America offices    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 1 1
Personal, small business and other | In North America offices | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In North America offices | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In North America offices | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In North America offices | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 1 1
Personal, small business and other | In North America offices | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In North America offices | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In offices outside North America    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 1 1
Personal, small business and other | In offices outside North America | Interest rate reduction    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In offices outside North America | Term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In offices outside North America | Payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In offices outside North America | Combination: interest rate reduction and term extension    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 1 1
Personal, small business and other | In offices outside North America | Combination: term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification 0 0
Personal, small business and other | In offices outside North America | Combination: interest rate reduction, term extension and payment delay    
Financing Receivable, Modified [Line Items]    
Total loans defaulted within one year of modification $ 0 $ 0