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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | $ 380 | $ 703
Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 144 | 375
Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 3 | 60
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 8
Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 233 | 260
Commercial And Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 254 | 451
Commercial And Industrial [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 73 | 258
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 1 | 2
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 5
Commercial And Industrial [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 180 | 186
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 3 | 9
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 1 | 4
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 | 2 | 5
Commercial Real Estate Construction - Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount |  | 2
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 |  | 2
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 257 | 462
Commercial Portfolio Segment [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 74 | 262
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 1 | 2
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 5
Commercial Portfolio Segment [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 182 | 193
Commercial investor real estate mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 89 | 151
Commercial investor real estate mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 40 | 40
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 48
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 | 0
Commercial investor real estate mortgage [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 49 | 63
Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 91 | 153
Total Investor Real Estate [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 42 | 42
Total Investor Real Estate [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 48
Total Investor Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 0
Total Investor Real Estate [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 49 | 63
Residential First Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 28 | 78
Residential First Mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 25 | 63
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 10
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 3
Residential First Mortgage [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 1 | 2
Home Equity Lines of Credit[Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 3
Home Equity Lines of Credit[Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 3
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 | 2 | 7
Home Equity Loan [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 1 | 5
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 0
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 | 1 | 2
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 32 | 88
Consumer Portfolio Segment [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 28 | 71
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 10
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 3
Consumer Portfolio Segment [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 4
Commercial Investor Real Estate Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 2
Commercial Investor Real Estate Construction [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 2 | 2
Commercial Investor Real Estate Construction [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 0
Commercial Investor Real Estate Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | 0 | 0
Commercial Investor Real Estate Construction [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Term extension, amount | $ 0 | $ 0

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