Investment Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Securities with no credit impairment in unrealized loss position	194
ARS portfolio redeemed or sold since acquisition	87.00%
ARS portfolio redeemed or sold since acquisition at or above cost	95.00%
Amortized cost securities	$ 9,148,000,000
Fair value securities	9,049,000,000
Carrying value of securities pledged	3,300,000,000
Liabilities secured by pledged collateral	2,300,000,000
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position	125
Amortized cost securities	9,000,000,000
Fair value securities	8,900,000,000
Auction-Rate Preferred Securities
Securities with no credit impairment in unrealized loss position	50
Auction-Rate State And Municipal Securities
Securities with no credit impairment in unrealized loss position	17
Auction-Rate 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
Amortized cost securities	25,000,000
Fair value securities	$ 23,000,000