Goodwill and Intangible Assets-Intangible Assets by Type (Detail) (USD $) In Millions, unless otherwise specified							9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Finite-lived Intangible Assets	Dec. 31, 2013 Finite-lived Intangible Assets	Sep. 30, 2014 Finite-lived Intangible Assets Weighted Average	Sep. 30, 2014 Finite-lived Intangible Assets Customer relationships—Investment Management	Dec. 31, 2013 Finite-lived Intangible Assets Customer relationships—Investment Management	Sep. 30, 2014 Finite-lived Intangible Assets Customer relationships—Investment Management Weighted Average	Sep. 30, 2014 Finite-lived Intangible Assets Customer contracts—Investment Services	Dec. 31, 2013 Finite-lived Intangible Assets Customer contracts—Investment Services	Sep. 30, 2014 Finite-lived Intangible Assets Customer contracts—Investment Services Weighted Average	Sep. 30, 2014 Finite-lived Intangible Assets Other	Dec. 31, 2013 Finite-lived Intangible Assets Other	Sep. 30, 2014 Finite-lived Intangible Assets Other Weighted Average	Sep. 30, 2014 Indefinite-lived Intangible Assets		Dec. 31, 2013 Indefinite-lived Intangible Assets		Sep. 30, 2014 Indefinite-lived Intangible Assets Customer relationships—Investment Management		Dec. 31, 2013 Indefinite-lived Intangible Assets Customer relationships—Investment Management		Sep. 30, 2014 Indefinite-lived Intangible Assets Trade name		Dec. 31, 2013 Indefinite-lived Intangible Assets Trade name
Intangible Assets by Major Class [Line Items]
Gross carrying amount	$ 7,112				$ 4,430			$ 2,013			$ 2,335			$ 82			$ 2,682	[1]			$ 1,321	[1]			$ 1,361	[1]
Accumulated amortization	(2,897)				(2,897)			(1,514)			(1,316)			(67)
Net carrying amount	$ 4,215	$ 4,452	$ 4,527	$ 4,809	$ 1,533	$ 1,760		$ 499	$ 594		$ 1,019	$ 1,150		$ 15	$ 16		$ 2,682	[1]	$ 2,692	[1]	$ 1,321	[1]	$ 1,323	[1]	$ 1,361	[1]	$ 1,369	[1]
Remaining weighted- average amortization period							11 years			11 years			11 years			4 years

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