v3.25.2
Loans - Gross Charge-Offs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]        
Total $ 54 $ 53 $ 71 $ 56
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 28
Four years prior to current year     0 0
Prior     27 23
Revolving loans     33 1
Revolving Loans Converted to Term Loans     0 0
Total     67 52
Commercial loans | Real estate, including construction        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current year     0  
One year prior to current year     0  
Two years prior to current year     0  
Three years prior to current year     0  
Four years prior to current year     0  
Prior     27  
Revolving loans     0  
Revolving Loans Converted to Term Loans     0  
Total 27 0 27 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 28
Four years prior to current year     0 0
Prior     0 23
Revolving loans     33 1
Revolving Loans Converted to Term Loans     0 0
Total 25 51 40 52
Commercial loans | Other commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 0 0 0 0
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     4 4
Total     4 4
Consumer loans | Home equity mortgages        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 0 0 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     4 4
Total 2 2 4 4
Consumer loans | Other consumer        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total $ 0 $ 0 $ 0 $ 0