Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Credit Derivatives [Line Items]
Cash received as collateral for derivative assets	$ 219		$ 219
Fair value of securities pledged as collateral for derivative assets	1		1
Cash posted as collateral for derivative liabilities	14		14
Net cash flow hedge income (loss) included in interest and fees on loans	(150)	$ 25	(269)	$ 47
Price alignment income	7		15
Net gain (loss) on open foreign currency positions	(1)	$ 0	(1)	$ 0
Allowance for credit losses on lending-related commitments	44		44		$ 51
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	42		42		44
Risk participation agreements covering standby and commercial letters of credit	91		91		107
Standby and commercial letters of credit	3,600		3,600		3,800
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	35		35		35
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	33		33		28
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	2		2		7
Notional amount of derivative credit risk participation agreements	$ 949		$ 949		951
Weighted average remaining maturity of credit risk participation agreements (in years)			4 years 1 month 6 days
Other financial derivative liabilities | Visa Class B
Credit Derivatives [Line Items]
Derivative, underlying investment (in shares)	780		780
Recurring
Credit Derivatives [Line Items]
Fair value of derivative liability	$ 1,601		$ 1,601		1,799
Level 3 | Recurring
Credit Derivatives [Line Items]
Fair value of derivative liability	14		14		12
Level 3 | Recurring | Other financial derivative liabilities
Credit Derivatives [Line Items]
Fair value of derivative liability	$ 14		$ 14		$ 12