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Allowance For Credit Losses (ModificationsByClassAndSegment) (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 45
Term Extension, Percentage 0.05%
Payment Deferral, Amount $ 164
Payment Deferral, Percentage 0.17%
Term Extension and Interest Rate Modification, Amount $ 3
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 212
Modification, Percentage 0.22%
Commercial Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 21
Term Extension, Percentage 0.04%
Payment Deferral, Amount $ 164
Payment Deferral, Percentage 0.29%
Term Extension and Interest Rate Modification, Amount $ 0
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 185
Modification, Percentage 0.32%
Consumer Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 24
Term Extension, Percentage 0.07%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 3
Term Extension and Interest Rate Modification, Percentage 0.01%
Total Modifications, Amount $ 27
Modification, Percentage 0.09%
Commercial And Industrial [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 18
Term Extension, Percentage 0.03%
Payment Deferral, Amount $ 164
Payment Deferral, Percentage 0.32%
Term Extension and Interest Rate Modification, Amount $ 0
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 182
Modification, Percentage 0.35%
Commercial Real Estate Mortgage - Owner-Occupied [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 2
Term Extension, Percentage 0.04%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 0
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 2
Modification, Percentage 0.05%
Commercial Real Estate Construction - Owner-Occupied [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 1
Term Extension, Percentage 0.17%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 0
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 1
Modification, Percentage 0.17%
Residential First Mortgage [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 22
Term Extension, Percentage 0.12%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 2
Term Extension and Interest Rate Modification, Percentage 0.01%
Total Modifications, Amount $ 24
Modification, Percentage 0.13%
Home Equity Lines of Credit[Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 1
Term Extension, Percentage 0.02%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 0
Term Extension and Interest Rate Modification, Percentage 0.00%
Total Modifications, Amount $ 1
Modification, Percentage 0.03%
Home Equity Loan [Member]  
Financing Receivable, Modifications [Line Items]  
Term extension, amount $ 1
Term Extension, Percentage 0.04%
Payment Deferral, Amount $ 0
Payment Deferral, Percentage 0.00%
Term Extension and Interest Rate Modification, Amount $ 1
Term Extension and Interest Rate Modification, Percentage 0.06%
Total Modifications, Amount $ 2
Modification, Percentage 0.09%