Derivative Instruments (Schedule Of Total Fair Value Of Company's Derivative Assets And Liabilities By Instrument And Balance Sheet Location) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Derivative [Line Items]
Derivative Instruments, Designated as hedging instruments	$ 268		$ 414
Derivative Instruments, Not designated as hedging instruments	111,804		137,642
Derivative Assets, Designated			16	[1]
Derivative assets, Not designated			753	[1]
Derivative assets, Total derivatives	815		769	[1]
Derivative liabilities, Designated			(43)	[1]
Derivative liabilities, Not designated			(6,755)	[1]
Derivative liabilities, Total derivatives			(6,798)	[1]
Notional Amount Outstanding, Total derivatives	112,072		138,056
Derivative Assets [Member]
Derivative [Line Items]
Derivative Assets, Designated	14	[1]
Derivative assets, Not designated	801	[1]
Derivative assets, Total derivatives	815	[1]
Derivative Assets [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Assets, Designated	14	[1]
Derivative Assets [Member] | Non-Insured Credit Default Swaps [Member]
Derivative [Line Items]
Derivative assets, Not designated	1	[1]
Derivative Liabilities [Member]
Derivative [Line Items]
Derivative liabilities, Designated	(46)	[1]
Derivative liabilities, Not designated	(7,226)	[1]
Derivative liabilities, Total derivatives	(7,272)	[1]
Derivative Liabilities [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative liabilities, Designated	(46)	[1]
Derivative Liabilities [Member] | Currency Swaps [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(6)	[1]
Derivative Liabilities [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(4,838)	[1]
Derivative Liabilities [Member] | Insured Swaps [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(9)	[1]
Derivative Liabilities [Member] | All Others [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(54)	[1]
Medium-Term Notes [Member] | Interest Rate Swaps-Embedded [Member]
Derivative [Line Items]
Derivative assets, Not designated	9	[1]
Derivative liabilities, Not designated	(13)	[1]
Derivative Assets-VIE [Member] | Non-Insured Credit Default Swaps-VIE [Member]
Derivative [Line Items]
Derivative assets, Not designated	709	[1]
Derivative Assets-VIE [Member] | All Other VIE [Member]
Derivative [Line Items]
Derivative assets, Not designated	4	[1]
Derivative Liabilities-VIE [Member] | Currency Swaps -VIE [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(18)	[1]
Derivative Liabilities-VIE [Member] | Non-Insured Credit Default Swaps-VIE [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(1,473)	[1]
Derivative Liabilities-VIE [Member] | Interest Rate Swaps-VIE [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(397)	[1]
Derivative Assets Other Investments [Member] | All Other-Embedded [Member]
Derivative [Line Items]
Derivative assets, Not designated		[1]
Derivative Liabilities Other Investments [Member] | All Other-Embedded [Member]
Derivative [Line Items]
Derivative liabilities, Not designated	(14)	[1]
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative assets, Not designated	78	[1]
Derivative liabilities, Not designated	(404)	[1]
Notional Amount Outstanding, Total derivatives	2,894
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Instruments, Designated as hedging instruments	268		394
Derivative Instruments, Not designated as hedging instruments			3,480
Derivative Assets, Designated			16	[1]
Derivative assets, Not designated			46	[1]
Derivative liabilities, Designated			(41)	[1]
Derivative liabilities, Not designated			(255)	[1]
Currency Swaps [Member]
Derivative [Line Items]
Derivative Instruments, Designated as hedging instruments			20
Derivative Instruments, Not designated as hedging instruments	65		47
Derivative liabilities, Designated			(2)	[1]
Derivative liabilities, Not designated			(4)	[1]
Currency Swaps -VIE [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	126		137
Derivative liabilities, Not designated			(14)	[1]
Insured Credit Default Swaps [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	83,968		99,331
Derivative liabilities, Not designated			(4,325)	[1]
Insured Swaps [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	7,409		10,537
Derivative liabilities, Not designated			(11)	[1]
Non-Insured Credit Default Swaps [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	30		35
Derivative assets, Not designated			3	[1]
Non-Insured Credit Default Swaps-VIE [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	3,599		3,973
Derivative assets, Not designated			687	[1]
Derivative liabilities, Not designated			(1,455)	[1]
Interest Rate Swaps-VIE [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	8,060		14,054
Derivative assets, Not designated			2	[1]
Derivative liabilities, Not designated			(634)	[1]
Interest Rate Swaps-Embedded [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	495		493
Derivative assets, Not designated			5	[1]
Derivative liabilities, Not designated			(7)	[1]
Interest Rate Swaps-Embedded-VIE [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments			100
Derivative liabilities, Not designated			(1)	[1]
All Others [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	4,525		4,644
Derivative liabilities, Not designated			(40)	[1]
All Other VIE [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	465		592
Derivative assets, Not designated			10	[1]
All Other-Embedded [Member]
Derivative [Line Items]
Derivative Instruments, Not designated as hedging instruments	168		219
Derivative liabilities, Not designated			$ (9)	[1]

[1] In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.