Goodwill and Other Intangible Assets (Commercial Mortgage Servicing Rights) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
Commercial Mortgage Servicing Rights [Member]
Beginning balance - January 1	$ 665		$ 921
Additions	80	[1]	48	[1]
Impairment (charge) reversal	(75)		(18)
Amortization expense	(78)		(37)
Sale of servcing rights			(192)	[2]
Ending balance - March 31	592		722
Originated MSRs [Member]
Additions	25		26
Purchased MSRs [Member]
Additions	$ 55		$ 22

[1] Additions for the first six months of 2011 included $25 million from loans sold with servicing retained and $55 million from purchases of servicing rights from thirdparties. Comparable amounts for the first six months of 2010 were $26 million and $22 million.

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