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Loans - Loan Payment Modifications by Type of Modification (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable, Modified [Line Items]    
Loans modified   $ 159
% of Total Loans   0.30%
Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified $ 65 $ 157
% of Total Loans 0.20% 0.40%
Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified   $ 96
% of Total Loans   1.20%
Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified $ 65 $ 61
% of Total Loans 0.40% 0.40%
Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified $ 0 $ 2
% of Total Loans   0.00%
Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loans modified   $ 1
% of Total Loans   0.00%
Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Loans modified   $ 1
% of Total Loans   0.50%
Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Loans modified   $ 0
Interest Rate Reduction | Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified 0 0
Interest Rate Reduction | Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Interest Rate Reduction | Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified 0 0
Interest Rate Reduction | Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Interest Rate Reduction | Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Interest Rate Reduction | Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Principal Forgiveness    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Principal Forgiveness | Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified 0 0
Principal Forgiveness | Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Principal Forgiveness | Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified 0 0
Principal Forgiveness | Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Principal Forgiveness | Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Principal Forgiveness | Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Term Extension / Significant Payment Deferral    
Financing Receivable, Modified [Line Items]    
Loans modified   146
Term Extension / Significant Payment Deferral | Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified 65 145
Term Extension / Significant Payment Deferral | Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified   96
Term Extension / Significant Payment Deferral | Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified 65 49
Term Extension / Significant Payment Deferral | Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified   1
Term Extension / Significant Payment Deferral | Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Term Extension / Significant Payment Deferral | Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Loans modified   1
Combination    
Financing Receivable, Modified [Line Items]    
Loans modified   13
Combination | Commercial loans    
Financing Receivable, Modified [Line Items]    
Loans modified 0 12
Combination | Commercial loans | Real estate, including construction    
Financing Receivable, Modified [Line Items]    
Loans modified   0
Combination | Commercial loans | Business and corporate banking    
Financing Receivable, Modified [Line Items]    
Loans modified $ 0 12
Combination | Consumer loans    
Financing Receivable, Modified [Line Items]    
Loans modified   1
Combination | Consumer loans | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loans modified   1
Combination | Consumer loans | Credit cards    
Financing Receivable, Modified [Line Items]    
Loans modified   $ 0