Loans and Allowance for Credit Losses, Significant Activity (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	$ 1,462	$ 635	$ 2,106	$ 1,202
Sales	(1,208)	(1,802)	(2,780)	(2,870)
Transfers from/(to) loans/mortgages held for sale	89	125	220	22
Total Commercial [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	1,462	509	2,106	1,052
Sales	(895)	(1,507)	(2,466)	(2,575)
Transfers from/(to) loans/mortgages held for sale	64	(72)	170	57
Total Consumer [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	0	126	0	150
Sales	(313)	(295)	(314)	(295)
Transfers from/(to) loans/mortgages held for sale	$ 25	$ 53	$ 50	$ (35)