v3.26.1
Loans - Gross Charge-Offs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]        
Total $ 38 $ 54 $ 54 $ 71
Commercial loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current year     17 0
One year prior to current year     0 0
Two years prior to current year     0 7
Three years prior to current year     0 0
Four years prior to current year     0 0
Prior     15 27
Revolving loans     16 33
Revolving Loans Converted to Term Loans     0 0
Total     48 67
Commercial loans | Business and corporate banking        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current year     17 0
One year prior to current year     0 0
Two years prior to current year     0 7
Three years prior to current year     0 0
Four years prior to current year     0 0
Prior     15 0
Revolving loans     16 33
Revolving Loans Converted to Term Loans     0 0
Total 35 25 48 40
Commercial loans | Commercial mortgages        
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 $ 0 $ 27 $ 0 $ 27