Asset Quality (Details 8) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Summary of allowance for loan and lease losses
Balance at beginning of period - continuing operations	$ 1,004	$ 1,604
Charge-offs	(132)	(232)
Recoveries	31	39
Net loans charged off	(101)	(193)
Provision for loan and lease losses from continuing operations	42	(40)
Foreign currency translation adjustment	(1)	1
Balance at end of period - continuing operations	$ 944	$ 1,372