Intangible Assets by Type (Detail) (USD $) In Millions, unless otherwise specified					6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2012 Finite-lived Intangible Assets	Dec. 31, 2011 Finite-lived Intangible Assets	Jun. 30, 2012 Finite-lived Intangible Assets Customer Relationships	Dec. 31, 2011 Finite-lived Intangible Assets Customer Relationships	Jun. 30, 2012 Finite-lived Intangible Assets Customer Contracts - Investment Services	Dec. 31, 2011 Finite-lived Intangible Assets Customer Contracts - Investment Services	Jun. 30, 2012 Finite-lived Intangible Assets Other Intangible Assets	Dec. 31, 2011 Finite-lived Intangible Assets Other Intangible Assets	Jun. 30, 2012 Indefinite-lived Intangible Assets		Dec. 31, 2011 Indefinite-lived Intangible Assets		Jun. 30, 2012 Indefinite-lived Intangible Assets Customer Relationships		Dec. 31, 2011 Indefinite-lived Intangible Assets Customer Relationships		Jun. 30, 2012 Indefinite-lived Intangible Assets Trade Name		Dec. 31, 2011 Indefinite-lived Intangible Assets Trade Name
Intangible Assets by Major Class [Line Items]
Gross carrying amount	$ 7,255				$ 4,572		$ 2,093		$ 2,348		$ 131		$ 2,683	[1]			$ 1,316	[1]			$ 1,367	[1]
Accumulated amortization	(2,293)				(2,293)		(1,267)		(925)		(101)
Net carrying amount	$ 4,962	$ 5,152	$ 5,514	$ 5,696	$ 2,279	$ 2,473	$ 826	$ 920	$ 1,423	$ 1,517	$ 30	$ 36	$ 2,683	[1]	$ 2,679	[1]	$ 1,316	[1]	$ 1,313	[1]	$ 1,367	[1]	$ 1,366	[1]
Remaining weighted- average amortization period					13 years		12 years		13 years		5 years

[1] Intangible assets not subject to amortization have an indefinite life.