Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Definite-lived intangible assets
Gross Carrying Amount	$ 528	$ 526
Accumulated Amortization	(246)	(201)
Net Carrying Amount	282	325
Definite-lived intangible assets acquired during the year, amount assigned	2
Definite-lived intangible assets acquired during the year, weighted-average amortization period (in years)	5
Increase (decrease) to net definite-lived intangible assets due to changes in foreign currency exchange rates		(5)	13
Aggregate amortization expense for definite-lived intangible assets	45	46	32
Estimated intangible amortization expense for next five years:
2012	46
2013	45
2014	40
2015	31
2016	27
Investment management contracts
Definite-lived intangible assets
Carrying amount of indefinite-lived intangible assets	630	630
Identifiable intangible assets with indefinite useful lives acquired during the year		615
Trade names
Definite-lived intangible assets
Carrying amount of indefinite-lived intangible assets	67	67
Identifiable intangible assets with indefinite useful lives acquired during the year		57
Customer relationships
Definite-lived intangible assets
Gross Carrying Amount	145	150
Accumulated Amortization	(69)	(38)
Net Carrying Amount	76	112
Contracts
Definite-lived intangible assets
Gross Carrying Amount	233	233
Accumulated Amortization	(122)	(103)
Net Carrying Amount	111	130
Other
Definite-lived intangible assets
Gross Carrying Amount	150	143
Accumulated Amortization	(55)	(60)
Net Carrying Amount	$ 95	$ 83