v3.25.1
Loans - Gross Charge-Offs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 17 $ 3
Commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current year 0 0
One year prior to current year 0 0
Two years prior to current year 7 0
Three years prior to current year 0 0
Four years prior to current year 0 0
Prior 0 0
Revolving loans 8 1
Revolving Loans Converted to Term Loans 0 0
Total 15 1
Commercial loans | Real estate, including construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Commercial loans | Business and corporate banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current year 0 0
One year prior to current year 0 0
Two years prior to current year 7 0
Three years prior to current year 0 0
Four years prior to current year 0 0
Prior 0 0
Revolving loans 8 1
Revolving Loans Converted to Term Loans 0 0
Total 15 1
Consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current year 0 0
One year prior to current year 0 0
Two years prior to current year 0 0
Three years prior to current year 0 0
Four years prior to current year 0 0
Prior 0 0
Revolving loans 2 2
Total 2 2
Consumer loans | Home equity mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Consumer loans | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current year 0 0
One year prior to current year 0 0
Two years prior to current year 0 0
Three years prior to current year 0 0
Four years prior to current year 0 0
Prior 0 0
Revolving loans 2 2
Total 2 2
Consumer loans | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 0 $ 0