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Loans And The Allowance For Credit Losses (Modifications By Class And Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 89	$ 204	$ 377	$ 353
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.21%	0.39%	0.36%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 81	$ 133	$ 351	$ 272
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.08%	0.14%	0.36%	0.28%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 1	$ 3	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 8	$ 41	$ 23	$ 50
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.04%	0.02%	0.05%
Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 29		$ 29
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.03%		0.03%
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 30	$ 56	$ 108	$ 88
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.10%	0.20%	0.16%
Commercial | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 30	$ 23	$ 108	$ 55
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.04%	0.20%	0.10%
Commercial | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Commercial | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 33	$ 0	$ 33
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.06%	0.00%	0.06%
Commercial | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Investor Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 101	$ 77	$ 128
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		1.14%	0.84%	1.46%
Investor Real Estate | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 72	$ 77	$ 99
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.82%	0.84%	1.13%
Investor Real Estate | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Investor Real Estate | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Investor Real Estate | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 29		$ 29
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.33%		0.33%
Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 59	$ 47	$ 192	$ 137
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.18%	0.14%	0.58%	0.41%
Consumer | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 51	$ 38	$ 166	$ 118
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.15%	0.11%	0.51%	0.36%
Consumer | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 1	$ 3	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.01%	0.01%
Consumer | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 8	$ 8	$ 23	$ 17
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.02%	0.07%	0.05%
Consumer | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 27	$ 54	$ 105	$ 84
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.11%	0.21%	0.17%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 27	$ 21	$ 105	$ 51
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.04%	0.21%	0.10%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 33	$ 0	$ 33
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.07%	0.00%	0.07%
Commercial And Industrial [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3	$ 2	$ 3	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.04%	0.07%	0.09%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3	$ 2	$ 3	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.04%	0.07%	0.08%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%	0.00%	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 101	$ 77	$ 128
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		1.54%	1.07%	1.95%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 72	$ 77	$ 99
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		1.10%	1.07%	1.51%
Commercial investor real estate mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Commercial investor real estate mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Commercial investor real estate mortgage [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 29		$ 29
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.44%		0.44%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 55	$ 40	$ 179	$ 121
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.28%	0.20%	0.90%	0.60%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 50	$ 37	$ 162	$ 115
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.25%	0.18%	0.81%	0.57%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 1	$ 3	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.01%	0.01%	0.01%
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 5	$ 2	$ 14	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.01%	0.07%	0.02%
Residential First Mortgage [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 4	$ 6	$ 7
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.13%	0.17%	0.22%
Home Equity Lines of Credit[Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 0	$ 1	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%	0.02%	0.01%
Home Equity Lines of Credit[Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 4	$ 5	$ 7
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.13%	0.14%	0.21%
Home Equity Lines of Credit[Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 3	$ 7	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.13%	0.30%	0.37%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 1	$ 3	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.03%	0.05%	0.11%	0.13%
Home Equity Loan [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%	0.00%	0.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 2	$ 4	$ 6
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.08%	0.19%	0.24%
Home Equity Loan [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.00%		0.00%

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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-Topic 310
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-Name Accounting Standards Codification
-Section 50
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