Goodwill and Other Intangible Assets (Commercial Mortgage Servicing Rights) (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Goodwill [Line Items]
Impairment charge	$ (157)		$ (99)
Commercial Mortgage Servicing Rights [Member]
Goodwill [Line Items]
Beginning balance - January 1	665		921
Additions	100	[1]	59	[1]
Amortization expense	(126)		(73)
Sale of servcing rights			(192)	[2]
Ending balance	482		616
Originated MSRs [Member]
Goodwill [Line Items]
Additions	37		34
Purchased MSRs [Member]
Goodwill [Line Items]
Additions	$ 63		$ 25

[1] Additions for the first nine months of 2011 included $37 million from loans sold with servicing retained and $63 million from purchases of servicing rights from third parties. Comparable amounts for the first nine months of 2010 were $34 million and $25 million.

[2] Reflects the sale of a duplicative agency servicing operation in 2010.