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Allowance For Credit Losses (ModificationsByClassAndSegment) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 185 | $ 212 | $ 773
Term Extension, Percentage | 0.19% | 0.22% |
Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 181 | $ 45 |
Term Extension, Percentage | 0.19% | 0.05% |
Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 164 |
Term Extension, Percentage |  | 0.17% |
Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 4 | $ 3 |
Term Extension, Percentage | 0.00% | 0.00% |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 41 | $ 185 | 347
Term Extension, Percentage | 0.07% | 0.32% |
Commercial Portfolio Segment [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 41 | $ 21 |
Term Extension, Percentage | 0.07% | 0.04% |
Commercial Portfolio Segment [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 164 |
Term Extension, Percentage |  | 0.29% |
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 | $ 0 |
Term Extension, Percentage | 0.00% | 0.00% |
Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 100 |  | 300
Term Extension, Percentage | 1.14% |  |
Total Investor Real Estate [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 100 |  |
Term Extension, Percentage | 1.14% |  |
Total Investor Real Estate [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 |  |
Term Extension, Percentage | 0.00% |  |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 44 | $ 27 | 126
Term Extension, Percentage | 0.13% | 0.09% |
Consumer Portfolio Segment [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 40 | $ 24 |
Term Extension, Percentage | 0.12% | 0.07% |
Consumer Portfolio Segment [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Consumer Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 4 | $ 3 |
Term Extension, Percentage | 0.01% | 0.01% |
Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 40 | $ 182 | 345
Term Extension, Percentage | 0.08% | 0.35% |
Commercial And Industrial [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 40 | $ 18 |
Term Extension, Percentage | 0.08% | 0.03% |
Commercial And Industrial [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 164 |
Term Extension, Percentage |  | 0.32% |
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 | $ 0 |
Term Extension, Percentage | 0.00% | 0.00% |
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 2 | 2
Term Extension, Percentage | 0.01% | 0.05% |
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 2 |
Term Extension, Percentage | 0.01% | 0.04% |
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 | $ 0 |
Term Extension, Percentage | 0.00% | 0.00% |
Commercial Real Estate Construction - Owner-Occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 1 |
Term Extension, Percentage |  | 0.17% |
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 1 |
Term Extension, Percentage |  | 0.17% |
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Commercial investor real estate mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 100 |  | 300
Term Extension, Percentage | 1.56% |  |
Commercial investor real estate mortgage [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 100 |  |
Term Extension, Percentage | 1.56% |  |
Commercial investor real estate mortgage [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 |  |
Term Extension, Percentage | 0.00% |  |
Residential First Mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 40 | $ 24 | 113
Term Extension, Percentage | 0.20% | 0.13% |
Residential First Mortgage [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 39 | $ 22 |
Term Extension, Percentage | 0.19% | 0.12% |
Residential First Mortgage [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 2 |
Term Extension, Percentage | 0.01% | 0.01% |
Home Equity Lines of Credit[Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 1 | 4
Term Extension, Percentage | 0.03% | 0.03% |
Home Equity Lines of Credit[Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 0 | $ 1 |
Term Extension, Percentage | 0.00% | 0.02% |
Home Equity Lines of Credit[Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 0 |
Term Extension, Percentage | 0.02% | 0.00% |
Home Equity Loan [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 3 | $ 2 | $ 9
Term Extension, Percentage | 0.12% | 0.09% |
Home Equity Loan [Member] | Extended Maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 1 | $ 1 |
Term Extension, Percentage | 0.04% | 0.04% |
Home Equity Loan [Member] | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 |
Term Extension, Percentage |  | 0.00% |
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 2 | $ 1 |
Term Extension, Percentage | 0.08% | 0.06% |

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