Business Segments (Summary Of Segments Within Wind-Down Operations) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010		Dec. 31, 2010
Revenues	$ 255	[1]	$ 274	[1]	$ 520	[1]	$ 675	[1]
Net gains (losses) on financial instruments at fair value and foreign exchange	(103)		(2)		(127)		(48)
Net investment losses related to other-than-temporary impairments	(20)		(13)		(33)		(43)
Net gains (losses) on extinguishment of debt			18		26		18
Other net realized gains (losses)			19		5		19
Revenues of consolidated VIEs	41		307		(48)		372
Total revenues	98		2,077		(1,510)		221
Operating expenses	98		83		189		168
Interest expense	75		81		150		165
Expenses of consolidated VIEs	22		18		47		37
Total expenses	245		109		400		512
Income (loss) before income taxes	(147)		1,968		(1,910)		(291)
Identifiable assets	31,668		33,464		31,668		33,464		32,279
Asset / Liability Products [Member]
Revenues	23	[2]	29	[2]	47	[2]	60	[2]
Net gains (losses) on financial instruments at fair value and foreign exchange	(132)		5		(216)		(20)
Net investment losses related to other-than-temporary impairments	(18)		(12)		(29)		(39)
Net gains (losses) on extinguishment of debt			18		24		18
Other net realized gains (losses)			0		4		0
Revenues of consolidated VIEs	1		9		11		21
Inter-segment revenues	(3)	[3]	(4)	[3]	(6)	[3]	(7)	[3]
Total revenues	(129)		45		(165)		33
Operating expenses	1		2		2		3
Interest expense	28		31		55		64
Inter-segment expenses	8	[3]	14	[3]	16	[3]	32	[3]
Total expenses	37		47		73		99
Income (loss) before income taxes	(166)		(2)		(238)		(66)
Identifiable assets	4,481		5,740		4,481		5,740
Conduits [Member]
Revenues	1	[2]	1	[2]	2	[2]	2	[2]
Revenues of consolidated VIEs	3		18		8		21
Inter-segment revenues	(1)	[3]	(1)	[3]	(2)	[3]	(2)	[3]
Total revenues	3		18		8		21
Operating expenses	(1)				(1)		0
Interest expense	(1)				(1)
Expenses of consolidated VIEs	5		3		10		7
Inter-segment expenses	1	[3]	2	[3]	2	[3]	3	[3]
Total expenses	4		5		10		10
Income (loss) before income taxes	(1)		13		(2)		11
Identifiable assets	1,564		1,880		1,564		1,880
Wind-down Eliminations [Member]
Inter-segment revenues			0	[3]			(1)	[3]
Total revenues			0				(1)
Inter-segment expenses			0	[3]			(1)	[3]
Total expenses			0				(1)
Identifiable assets	(405)		(231)		(405)		(231)
Wind-Down Operations [Member]
Revenues	24	[1],[2]	30	[1],[2]	49	[1],[2]	62	[1],[2]
Net gains (losses) on financial instruments at fair value and foreign exchange	(132)		5		(216)		(20)
Net investment losses related to other-than-temporary impairments	(18)		(12)		(29)		(39)
Net gains (losses) on extinguishment of debt			18		24		18
Other net realized gains (losses)			0		4		0
Revenues of consolidated VIEs	4		27		19		42
Inter-segment revenues	(4)	[3],[4]	(5)	[3],[4]	(8)	[3],[4]	(10)	[3],[4]
Total revenues	(126)		63		(157)		53
Operating expenses			2		1		3
Interest expense	27		31		54		64
Expenses of consolidated VIEs	5		3		10		7
Inter-segment expenses	9	[3],[4]	16	[3],[4]	18	[3],[4]	34	[3],[4]
Total expenses	41		52		83		108
Income (loss) before income taxes	(167)		11		(240)		(55)
Identifiable assets	$ 5,640		$ 7,389		$ 5,640		$ 7,389

[1] Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.

[2]

[3] Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.

[4] Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.