Intangible Assets (Schedule Of The Carrying Amounts Of Identifiable Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Claymore Investments, Inc. [Member]	Sep. 30, 2012 Swiss Re Private Partners [Member]	Sep. 30, 2012 Indefinite-lived Intangible Assets [Member]	Dec. 31, 2011 Indefinite-lived Intangible Assets [Member]	Sep. 30, 2012 Indefinite-lived Intangible Assets [Member] Claymore Investments, Inc. [Member]	Sep. 30, 2012 Finite-Lived Intangible Assets [Member]	Sep. 30, 2012 Finite-Lived Intangible Assets [Member] Swiss Re Private Partners [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Beginning balance			$ 17,356				$ 16,760	$ 16,597		$ 759
Transaction					163	40			163		40
Amortization expense	(39)	(39)	(117)	(117)						(117)
Intangible assets, Ending balance	$ 17,442		$ 17,442				$ 16,760	$ 16,597		$ 682