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Loans And The Allowance For Credit Losses (Modifications By Class And Segment) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 411	$ 887
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.43%	0.90%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 321	$ 696
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.33%	0.71%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 2	$ 142
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.14%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 24	$ 12
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	0.01%
us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 37
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.04%
Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 30
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.03%
Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 34
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.04%
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 53	$ 561
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.10%	1.00%
Commercial | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 49	$ 384
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.68%
Commercial | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 140
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.25%
Commercial | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%
Commercial | us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 37
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.07%
Commercial | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%
Commercial | 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
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 172	$ 213
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.98%	2.41%
Investor Real Estate | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 111	$ 213
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.28%	2.41%
Investor Real Estate | 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%
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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%
Investor Real Estate | 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%
Investor Real Estate | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 27
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.31%
Investor Real Estate | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 34
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.39%
Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 186	$ 113
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.56%	0.34%
Consumer | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 161	$ 99
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.49%	0.29%
Consumer | Payment Deferral
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	0.01%	0.01%
Consumer | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 23	$ 12
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.07%	0.03%
Consumer | 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%
Consumer | Other Loan Modification type
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 | 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 And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 50	$ 555
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.10%	1.09%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 46	$ 379
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.09%	0.75%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 0	$ 139
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.27%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%	0.00%
Commercial And Industrial [Member] | us-gaap_ExtendedMaturityAndPaymentDeferralMember
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 37
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.07%
Commercial And Industrial [Member] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.01%
Commercial And Industrial [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]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 3	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	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	$ 3	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.05%	0.05%
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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%
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 Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.81%
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		0.67%
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount		$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage		0.15%
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	$ 172	$ 213
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	2.62%	3.23%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 111	$ 213
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	1.69%	3.23%
Commercial investor real estate mortgage [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 mortgage [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 mortgage [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] | Other Loan Modification type
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 27
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.42%
Commercial investor real estate mortgage [Member] | Contractual Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 34
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.52%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 164	$ 99
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.82%	0.49%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 156	$ 94
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.78%	0.46%
Residential First Mortgage [Member] | Payment Deferral
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	0.01%	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	$ 6	$ 3
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.03%	0.02%
Residential First Mortgage [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%
Residential First Mortgage [Member] | Other Loan Modification type
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] | 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]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 10	$ 5
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.30%	0.13%
Home Equity Lines of Credit[Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 1	$ 1
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.02%	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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	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	$ 9	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.29%	0.11%
Home Equity Lines of Credit[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%
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
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.00%
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 Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 12	$ 9
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.51%	0.35%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 4	$ 4
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.17%	0.17%
Home Equity Loan [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%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, amount	$ 8	$ 5
Financing Receivable, Excluding Accrued Interest, Modified in Period, Percentage	0.34%	0.18%
Home Equity Loan [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%
Home Equity Loan [Member] | Other Loan Modification type
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] | 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%

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- Definition

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

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