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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 204	$ 380	$ 353	$ 703
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.21%	0.38%	0.36%	0.71%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 133	$ 317	$ 272	$ 495
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.14%	0.32%	0.28%	0.45%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 11	$ 2	$ 151
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.01%	0.00%	0.15%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 41	$ 4	$ 50	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.00%	0.05%	0.01%
us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 48		$ 48
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.05%		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 Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 56	$ 257	$ 88	$ 462
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.10%	0.45%	0.16%	0.81%
Commercial Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 23	$ 200	$ 55	$ 266
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.35%	0.10%	0.47%
Commercial Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 9	$ 0	$ 148
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.02%	0.00%	0.26%
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 33	$ 0	$ 33	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.06%	0.00%	0.06%	0.00%
Commercial Portfolio Segment [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 48		$ 48
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.08%		0.08%
Commercial Portfolio Segment [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%
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 101	$ 91	$ 128	$ 153
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.14%	1.04%	1.46%	1.75%
Total Investor Real Estate [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 72	$ 91	$ 99	$ 153
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.82%	1.04%	1.13%	1.75%
Total Investor Real Estate [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%
Total Investor Real Estate [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%
Total Investor Real Estate [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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%
Total Investor Real Estate [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	0.33%		0.33%
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 47	$ 32	$ 137	$ 88
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.14%	0.10%	0.41%	0.26%
Consumer Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 38	$ 26	$ 118	$ 76
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.11%	0.08%	0.36%	0.23%
Consumer Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 2	$ 2	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.01%	0.01%	0.01%
Consumer Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 8	$ 4	$ 17	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.01%	0.05%	0.03%
Consumer Portfolio Segment [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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%
Consumer Portfolio Segment [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 And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 54	$ 254	$ 84	$ 451
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.11%	0.49%	0.17%	0.87%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 21	$ 197	$ 51	$ 255
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.38%	0.10%	0.49%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 9	$ 0	$ 148
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.02%	0.00%	0.29%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 33	$ 0	$ 33	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.07%	0.00%	0.07%	0.00%
Commercial And Industrial [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 48		$ 48
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.09%		0.09%
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	$ 2	$ 3	$ 4	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.06%	0.09%	0.18%
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	$ 4	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%	0.06%	0.08%	0.18%
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 Real Estate Mortgage - Owner-Occupied [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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] | 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 Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount				$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage				0.86%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount				$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage				0.71%
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral
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 Construction - Owner-Occupied [Member] | Extended Maturity and 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 Construction - Owner-Occupied [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 101	$ 89	$ 128	$ 151
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.54%	1.39%	1.95%	2.35%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 72	$ 89	$ 99	$ 151
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.10%	1.39%	1.51%	2.35%
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	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	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	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%	0.00%	0.00%
Commercial investor real estate mortgage [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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] | 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%
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 2		$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.08%		0.08%
Commercial Investor Real Estate Construction [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 2		$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.08%		0.08%
Commercial Investor Real Estate Construction [Member] | Payment Deferral
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 Construction [Member] | Extended Maturity and Interest Rate Reduction
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 Construction [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 40	$ 28	$ 121	$ 78
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.20%	0.14%	0.60%	0.39%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 37	$ 25	$ 115	$ 72
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.18%	0.12%	0.57%	0.36%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 2	$ 2	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	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	$ 2	$ 1	$ 4	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%	0.01%	0.02%	0.02%
Residential First Mortgage [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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%
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	$ 4	$ 2	$ 7	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.13%	0.05%	0.22%	0.10%
Home Equity Lines of Credit[Member] | Extended Maturity
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%	0.01%	0.02%
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	$ 4	$ 2	$ 7	$ 2
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.13%	0.04%	0.21%	0.08%
Home Equity Lines of Credit[Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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] | 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	$ 3	$ 2	$ 9	$ 7
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.13%	0.09%	0.37%	0.29%
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	0.05%	0.04%	0.13%	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	$ 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	$ 1	$ 6	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.08%	0.05%	0.24%	0.15%
Home Equity Loan [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
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] | 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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