Loan Servicing (Residential Mortgage Loans Managed or Securitized and Related Delinquencies and Net Charge-Offs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Loan Servicing [Abstract]
Mortgage Loans managed or securitized	$ 26,166	[1]	$ 26,559	[1]
Less: Loans securitized and transferred to securities available for sale	4		4
Loans held for sale	2,209		3,394
Covered mortgage loans	1,212		1,264
Residential mortgage loans sold with recourse liability	1,228		1,316
Mortgage loans held for investment	21,513		20,581
Mortgage loans on nonaccrual status	320		308
Mortgage loans 90 days or more past due and still accruing interest	72	[2]	104	[2]
Mortgage loans net charge-offs	$ 41	[3]	$ 264

[1] Balances exclude loans serviced for others with no other continuing involvement.

[2] Includes amounts related to residential mortgage loans held for sale and excludes amounts related to government guaranteed loans and covered mortgage loans. Refer to Loans and Leases Note for additional disclosures related to past due government guaranteed loans.

[3] Net charge-offs for March 31, 2012 reflect three months.