Derivative And Credit-Related Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair value of securities pledged as collateral for derivative assets	$ 141,000,000
Cash received as collateral for derivative assets	4,000,000
Available-for-sale securities pledged as collateral	10,000,000
Cash posted as collateral	13,000,000
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	14,000,000
Collateral pledged for aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	9,000,000
Additional required overnight collateral on derivatives with credit-risk contingent features at period end should the credit-risk contingent features be triggered	5,000,000
Net interest income generated by risk management fair value interest rate swaps	72,000,000	69,000,000
Net gain on open foreign currency positions	1,000,000	1,000,000
Allowance for credit losses on lending-related commitments	36,000,000	32,000,000
Allowance for credit losses on lending-related commitments, unused commitments to extend credit	28,000,000	19,000,000
Latest year of contract expiration on standby and commercial letters of credit	2022
Risk participation agreements covering standby and commercial letters of credit	259,000,000	325,000,000
Standby and commercial letters of credit	4,400,000,000	5,100,000,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	59,000,000	82,000,000
Deferred fees	51,000,000	69,000,000
Allowance for credit losses on lending-related commitments, standby and commercial letters of credit	8,000,000	13,000,000
Notional Amount of Derivative Credit Risk Participation Agreements	614,000,000	574,000,000
Maximum estimated exposure to credit risk participation agreements assuming 100% default	7,000,000	11,000,000
Weighted average remaining maturity of credit risk participation agreements, in years	2 years 7 months 17 days
Fair value of Visa derivative liability	249,000,000	408,000,000
Visa derivative contract [Member]
Notional amount of the derivative contract equivalent to Visa Class B shares	780,000
Fair value of Visa derivative liability	2,000,000	1,000,000
Sterling [Member]
Allowance for credit losses on lending-related commitments	0	0
Remaining fair value adjustment for unfunded commitments and letters of credit	1,000,000	2,000,000
Risk Management Derivatives Member | Fair Value Hedging [Member]
Net hedge ineffectiveness gain (loss) recognized in other noninterest income		$ (1,000,000)