Investment Securities (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Securities with no credit impairment in unrealized loss position	155
Amortized cost securities	$ 9,273,000,000
Fair value securities	9,284,000,000
Carrying value of securities pledged	3,300,000,000
Liabilities secured by pledged collateral	2,100,000,000
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position	90
Amortized cost securities	9,100,000,000
Fair value securities	9,100,000,000
Auction Rate Preferred Securities [Member]
Securities with no credit impairment in unrealized loss position	46
State And Municipal Securities
Securities with no credit impairment in unrealized loss position	17
Corporate Debt Securities
Securities with no credit impairment in unrealized loss position	1
Equity and Other Non-Debt Securities
Securities with no credit impairment in unrealized loss position	1
Auction-Rate Securities [Member]
ARS portfolio redeemed or sold since acquisition	89.00%
ARS portfolio redeemed or sold since acquisition at or above cost	95.00%
Amortized cost securities	24,000,000
Fair value securities	$ 23,000,000