Derivative Instruments (Summary Of Effect Of Derivative Instruments On Consolidated Statement Of Operations) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivatives In Fair Value Hedging Relationships [Member]
Gain (Loss) Recognized in Income on Derivative	$ 8	$ 1	$ 4	$ (41)
Gain (Loss) Recognized in Income on Hedged item	(8)	(1)	(4)	41
Net Gain (Loss) Recognized in Income	(3)	(1)	(5)	(1)
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member]
Net Gain (Loss) Recognized in Income			(5)
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Gain (Loss) Recognized in Income on Derivative	8	1	2	(41)
Gain (Loss) Recognized in Income on Hedged item	(8)	(1)	(2)	41
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest Income (Expense) [Member]
Net Gain (Loss) Recognized in Income	(3)	(2)		(1)
Derivatives In Fair Value Hedging Relationships [Member] | Currency Swaps [Member] | Interest Income (Expense) [Member]
Net Gain (Loss) Recognized in Income		1
Derivatives Not Designated As Hedging Instruments [Member]
Net Gain (Loss) Recognized in Income	(148)	1,308	(2,017)	(1,017)
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Net Gain (Loss) Recognized in Income	(53)	(84)	(51)	(124)
Derivatives Not Designated As Hedging Instruments [Member] | Currency Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Net Gain (Loss) Recognized in Income	(2)	(23)	(7)	(36)
Derivatives Not Designated As Hedging Instruments [Member] | Currency Swaps -VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member]
Net Gain (Loss) Recognized in Income	(4)		(2)
Derivatives Not Designated As Hedging Instruments [Member] | Insured Credit Default Swaps [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member]
Net Gain (Loss) Recognized in Income	140	1,528	(1,272)	(665)
Derivatives Not Designated As Hedging Instruments [Member] | Insured Credit Default Swaps [Member] | Realized Gains (Losses) And Other Settlements On Insured Derivatives [Member]
Net Gain (Loss) Recognized in Income	(191)	(64)	(546)	(98)
Derivatives Not Designated As Hedging Instruments [Member] | Insured Swaps [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member]
Net Gain (Loss) Recognized in Income		1
Derivatives Not Designated As Hedging Instruments [Member] | Non-Insured Credit Default Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Net Gain (Loss) Recognized in Income	(1)	2	(2)	1
Derivatives Not Designated As Hedging Instruments [Member] | Non-Insured Credit Default Swaps-VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member]
Net Gain (Loss) Recognized in Income	7	(21)	(150)	(3)
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps-VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member]
Net Gain (Loss) Recognized in Income	(22)	(53)	49	(85)
Derivatives Not Designated As Hedging Instruments [Member] | Credit Linked Notes [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Net Gain (Loss) Recognized in Income		11		18
Derivatives Not Designated As Hedging Instruments [Member] | All Others [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member]
Net Gain (Loss) Recognized in Income	1	4		(8)
Derivatives Not Designated As Hedging Instruments [Member] | All Others [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member]
Net Gain (Loss) Recognized in Income	(24)	9	(35)	(8)
Derivatives Not Designated As Hedging Instruments [Member] | All Other VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member]
Net Gain (Loss) Recognized in Income	$ 1	$ (2)	$ (1)	$ (9)