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Loans And The Allowance For Credit Losses (Modifications By Class And Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 225	$ 75	$ 372	$ 231
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.23%	0.08%	0.38%	0.24%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 207	$ 70	$ 340	$ 221
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.21%	0.07%	0.35%	0.23%
Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 12	$ 1	$ 13	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.00%	0.01%	0.00%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 6	$ 4	$ 15	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.00%	0.02%	0.01%
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 47	$ 26	$ 101	$ 39
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.05%	0.18%	0.07%
Commercial | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 37	$ 26	$ 87	$ 38
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.07%	0.05%	0.16%	0.07%
Commercial | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.01%
Commercial | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 10	$ 0	$ 10	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.00%	0.02%	0.00%
Commercial | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 0	$ 0	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%	0.00%	0.00%
Investor Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 109		$ 133	$ 100
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.19%		1.46%	1.14%
Investor Real Estate | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 109		$ 133	$ 100
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.19%		1.46%	1.14%
Investor Real Estate | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
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%
Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 69	$ 49	$ 138	$ 92
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.21%	0.15%	0.42%	0.28%
Consumer | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 61	$ 44	$ 120	$ 83
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.19%	0.13%	0.36%	0.25%
Consumer | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
Consumer | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 1	$ 3	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.00%	0.01%	0.00%
Consumer | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 6	$ 4	$ 15	$ 8
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.01%	0.05%	0.02%
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 45	$ 23	$ 99	$ 36
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.05%	0.20%	0.07%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 35	$ 23	$ 85	$ 35
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.07%	0.05%	0.17%	0.07%
Commercial And Industrial [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.01%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 10	$ 0	$ 10	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.00%	0.02%	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	$ 0	$ 0	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%	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	$ 2	$ 3	$ 2	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.03%	0.05%	0.04%	0.06%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 3	$ 2	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.03%	0.05%	0.04%	0.06%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
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	$ 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] | 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 investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 109		$ 133	$ 100
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.56%		1.92%	1.53%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 109		$ 133	$ 100
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.56%		1.92%	1.53%
Commercial investor real estate mortgage [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
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%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 65	$ 45	$ 129	$ 83
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.33%	0.22%	0.64%	0.41%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 60	$ 43	$ 117	$ 80
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.30%	0.21%	0.58%	0.40%
Residential First Mortgage [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 1	$ 3	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.00%	0.02%	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	$ 3	$ 1	$ 9	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.00%	0.04%	0.01%
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 1	$ 4	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.06%	0.12%	0.08%
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	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.00%	0.02%	0.01%
Home Equity Lines of Credit[Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
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	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	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	$ 1	$ 1	$ 3	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.05%	0.10%	0.07%
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3	$ 3	$ 5	$ 6
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.12%	0.13%	0.21%	0.24%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 1	$ 2	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.05%	0.09%	0.08%
Home Equity Loan [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount			$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage			0.00%
Home Equity Loan [Member] | Payment Deferral
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%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 2	$ 3	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.08%	0.12%	0.16%

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