Fair Values of Assets and Liabilities (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Fair Values of Assets and Liabilities (Textuals) [Abstract]
Fair value measurement transfers from one level to another			$ 0	$ 0
Mortgage loans held for sale measured at fair value gain losses	(11,000,000)	84,000,000	(136,000,000)	126,000,000
Mortgage loans held for sale	3,300,000,000		3,300,000,000
Fair value of mortgage loans held for sale exceeded the unpaid principal	117,000,000		117,000,000
Carrying value of unfunded commitments and standby letters of credit	361,000,000		361,000,000		353,000,000
Carrying value of other guarantees	425,000,000		425,000,000		330,000,000
Net gains and losses on net derivative assets and liabilities included in other non interest income	232,000,000	372,000,000	227,000,000	613,000,000
Net gains and losses on net derivative assets and liabilities included in mortgage banking revenue	141,000,000	315,000,000	189,000,000	446,000,000
Net Change on other assets and liabilities in unrealized gains (Losses) included in other non interest income	115,000,000	260,000,000	(14,000,000)	338,000,000
Net Change on other assets and liabilities in unrealized gains (Losses) included in mortgage banking revenue	(145,000,000)	(192,000,000)	(155,000,000)	(297,000,000)
Net gains and losses on net derivative assets and liabilities included in securities gains (losses)	(9,000,000)	(21,000,000)	(15,000,000)	(67,000,000)
Net gains and losses on net derivative assets and liabilities included in interest income	$ 15,000,000	$ 14,000,000	$ 31,000,000	$ 27,000,000