Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) (Nondesignated [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Net gain/(loss) recognized in income	$ 451	$ (44)
Unrealized Gains Losses On Insured Derivatives [Member] | Credit Default Swap [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	823	(103)
Unrealized Gains Losses On Insured Derivatives [Member] | All Other [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	15	30
Unrealized Gains Losses On Insured Derivatives [Member] | Insured Swaps [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0
Realized Gains Losses And Other Settlements On Insured Derivatives [Member] | Credit Default Swap [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	(339)	12
Realized Gains Losses And Other Settlements On Insured Derivatives [Member] | All Other [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	(30)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Non Insured Credit Default Swaps [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	0
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	(23)	3
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	2
Foreign Exchange And Other Derivative Financial Instruments [Member] | All Other [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	(1)	0
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Non Insured Credit Default Swaps V I E [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	0
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Interest Rate Swaps V I E [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	0	13
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Currency Swaps Vie [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	6	(1)
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | All Other V I E [Member]
Derivative [Line Items]
Net gain/(loss) recognized in income	$ 0	$ 0