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Loans And The Allowance For Credit Losses(Aging and Non-Accrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	$ 411	$ 887
Financing receivable no allowance	119	280
Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	53	561
Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	172	213
Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	186	113
Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	233	593
Current | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	36	356
Current | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	66	151
Current | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	131	86
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	32	17
Financial Asset, 30 to 89 Days Past Due | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, 30 to 89 Days Past Due | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, 30 to 89 Days Past Due | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	32	17
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	13	10
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	5
Financial Asset, Equal to or Greater than 90 Days Past Due | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	13	5
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	133	267
Non-performing [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	17	200
Non-performing [Member] | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	106	62
Non-performing [Member] | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	10	5
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	50	555
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	34	355
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	5
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	16	195
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	3	3
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	2	1
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	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]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	2
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period		3
Commercial Real Estate Construction - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period		0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period		0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period		0
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period		3
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	172	213
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	66	151
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial investor real estate mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial investor real estate mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	106	62
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	164	99
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	113	75
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	31	16
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	13	5
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	7	3
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	10	5
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	9	5
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Lines of Credit[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Lines of Credit[Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	12	9
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	9	6
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	1
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Loan [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	$ 2	$ 2

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- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

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