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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	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 75	$ 186	$ 231	$ 376
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	635	376	635	376
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	26	92	39	256
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	226	256	226	256
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		63	100	63
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	266	63	266	63
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	49	31	92	57
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	143	57	143	57
Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	392	303	392	303
Current | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	151	206	151	206
Current | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	130	48	130	48
Current | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	111	49	111	49
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	17	6	17	6
Financial Asset, 30 to 89 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	0	2	0	2
Financial Asset, 30 to 89 Days Past Due | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	0	0	0	0
Financial Asset, 30 to 89 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	17	4	17	4
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, Current	10	1	10	1
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	0	0	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	0	0	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	10	1	10	1
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	216	66	216	66
Non-performing [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	75	48	75	48
Non-performing [Member] | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	136	15	136	15
Non-performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	5	3	5	3
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	23	81	36	243
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	223	243	223	243
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	149	198	149	198
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, Current	0	2	0	2
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, Current	0	0	0	0
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	74	43	74	43
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	8	3	10
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	3	10	3	10
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	2	6	2	6
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, Current	0	0	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, Current	0	0	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, Current	1	4	1	4
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		3		3
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current		3		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, Current		2		2
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, Current		0		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, Current		0		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, Current		1		1
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		63	100	63
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	266	63	266	63
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	130	48	130	48
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, Current	0	0	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, Current	0	0	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, Current	136	15	136	15
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	45	27	83	50
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	129	50	129	50
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	99	44	99	44
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, Current	16	4	16	4
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, Current	10	1	10	1
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	4	1	4	1
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1	3	2
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	4	2	4	2
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	4	1	4	1
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, Current	0	0	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, Current	0	0	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, Current	0	1	0	1
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	3	6	5
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	10	5	10	5
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	8	4	8	4
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, Current	1	0	1	0
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, Current	0	0	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, Current	$ 1	$ 1	$ 1	$ 1

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