Goodwill and Intangible Assets-Intangible Assets by Type (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
Intangible Assets by Major Class [Line Items]
Gross carrying amount	6,788
Accumulated amortization	(2,741)
Net carrying amount	4,047		4,127		4,380	4,452
Finite-lived Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross carrying amount	4,122
Accumulated amortization	(2,741)
Net carrying amount	1,381		1,452
Finite-lived Intangible Assets | Weighted Average
Intangible Assets by Major Class [Line Items]
Remaining weighted- average amortization period	11 years
Finite-lived Intangible Assets | Customer relationships—Investment Management
Intangible Assets by Major Class [Line Items]
Gross carrying amount	1,733
Accumulated amortization	(1,292)
Net carrying amount	441		464
Finite-lived Intangible Assets | Customer relationships—Investment Management | Weighted Average
Intangible Assets by Major Class [Line Items]
Remaining weighted- average amortization period	11 years
Finite-lived Intangible Assets | Customer contracts—Investment Services
Intangible Assets by Major Class [Line Items]
Gross carrying amount	2,314
Accumulated amortization	(1,386)
Net carrying amount	928		974
Finite-lived Intangible Assets | Customer contracts—Investment Services | Weighted Average
Intangible Assets by Major Class [Line Items]
Remaining weighted- average amortization period	11 years
Finite-lived Intangible Assets | Other
Intangible Assets by Major Class [Line Items]
Gross carrying amount	75
Accumulated amortization	(63)
Net carrying amount	12		14
Finite-lived Intangible Assets | Other | Weighted Average
Intangible Assets by Major Class [Line Items]
Remaining weighted- average amortization period	4 years
Indefinite-lived Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross carrying amount	2,666	[1]
Net carrying amount	2,666	[1]	2,675	[1]
Indefinite-lived Intangible Assets | Customer relationships—Investment Management
Intangible Assets by Major Class [Line Items]
Gross carrying amount	1,308	[1]
Net carrying amount	1,308	[1]	1,315	[1]
Indefinite-lived Intangible Assets | Trade name
Intangible Assets by Major Class [Line Items]
Gross carrying amount	1,358	[1]
Net carrying amount	1,358	[1]	$ 1,360	[1]

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