Goodwill (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Mar. 07, 2012	Sep. 30, 2012
Goodwill, Beginning balance		$ 12,792
Acquisition	212
Excess tax basis amortization		(15)	[1]
Goodwill, Ending balance		12,908
Claymore Investments, Inc. [Member]
Acquisition		106	[2]
Swiss Re Private Partners [Member]
Acquisition		$ 25	[3]

[1] At September 30, 2012, the balance of the Quellos tax-deductible goodwill in excess of book goodwill was approximately $332 million. Goodwill related to the acquisition of the fund-of-funds business of Quellos Group, LLC (the "Quellos Transaction") will continue to be reduced in future periods by the amount of tax benefits realized from tax-deductible goodwill in excess of book goodwill from the Quellos Transaction.

[2] Amount represents goodwill resulting from the Company's acquisition of the Canadian exchange-traded products ("ETP") provider, Claymore Investments, Inc. (the "Claymore Transaction") on March 7, 2012 for approximately $212 million.

[3] Amount represents goodwill resulting from the Company's acquisition of the European private equity and infrastructure funds of funds of Swiss Re Private Equity Partners ("SRPEP") (the "SRPEP Transaction") on September 4, 2012.