Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	$ 325	$ 1,445	$ (2,960)
Fair Value Hedging [Member]
Derivative [Line Items]
Gain/(loss) recognized in income on derivative		12	(6)
Gain/(loss) recognized in income on hedged item		(12)	6
Net gain/(loss) recognized in income		(3)	(9)
Unrealized Gains Losses On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	1,725	1,847	(389)
Unrealized Gains Losses On Insured Derivatives [Member] | All Other [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	52	22	(52)
Unrealized Gains Losses On Insured Derivatives [Member] | Insured Swaps [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	1	0
Realized Gains Losses And Other Settlements On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	(1,545)	(406)	(2,371)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Non Insured Credit Default Swaps [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	(1)	(2)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	65	(75)	(193)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Gain/(loss) recognized in income on derivative		12	(8)
Gain/(loss) recognized in income on hedged item		(12)	8
Net gain/(loss) recognized in income		0	0
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	1	(2)	(1)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Gain/(loss) recognized in income on derivative		0	2
Gain/(loss) recognized in income on hedged item		0	(2)
Net gain/(loss) recognized in income		0	0
Foreign Exchange And Other Derivative Financial Instruments [Member] | All Other [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	11	(6)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Credit Linked Notes [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income			0
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Non Insured Credit Default Swaps V I E [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	(1)	12
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Interest Rate Swaps V I E [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	17	55	53
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Currency Swaps Vie [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	10	(4)	(3)
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | All Other V I E [Member] | Nondesignated [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	(2)	(8)
Interest Income Expense [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Gain/(loss) recognized in income on derivative		0	0
Gain/(loss) recognized in income on hedged item		0	0
Net gain/(loss) recognized in income		$ (3)	$ (9)