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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (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
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 41 | 185 | 347
Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 100 |  | 300
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 44 | 27 | 126
Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 197 | 451
Current | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 171 | 162
Current | Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 192
Current | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 26 | 97
Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 14
Financial Asset, 30 to 89 Days Past Due | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Financial Asset, 30 to 89 Days Past Due | Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 0
Financial Asset, 30 to 89 Days Past Due | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 14
Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 8
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 8
Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 15 | 300
Non-performing [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 14 | 185
Non-performing [Member] | Total Investor Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 108
Non-performing [Member] | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 1 | 7
Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 40 | 182 | 345
Commercial And Industrial [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 169 | 161
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Commercial And Industrial [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 13 | 184
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 1 | 2 | 2
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 2 | 1
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 1
Commercial Real Estate Construction - Owner-Occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 1 |
Commercial Real Estate Construction - Owner-Occupied [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 |
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 |
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 |
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 1 |
Commercial investor real estate mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 100 |  | 300
Commercial investor real estate mortgage [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 192
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 0
Commercial investor real estate mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 0
Commercial investor real estate mortgage [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  |  | 108
Residential First Mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 40 | 24 | 113
Residential First Mortgage [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 23 | 87
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 13
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 8
Residential First Mortgage [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 1 | 5
Home Equity Lines of Credit[Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | 1 | 1 | 4
Home Equity Lines of Credit[Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 1 | 4
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Home Equity Lines of Credit[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Home Equity Lines of Credit[Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Home Equity Loan [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount | $ 3 | 2 | 9
Home Equity Loan [Member] | Current |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 2 | 6
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 1
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | 0 | 0
Home Equity Loan [Member] | Non-performing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Term extension, amount |  | $ 0 | $ 2

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