Derivative Instruments (Total Fair Value Of Company's Derivative Assets And Liabilities By Instrument And Balance Sheet Location, Before Counterparty Netting) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Derivative notional amount	$ 31,316		$ 58,640
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	31,316		58,640
Derivative Liabilities [Member]
Derivative [Line Items]
Derivative liabilities, Total derivatives	(1,347)	[1]	(3,425)	[1]
Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(1,347)	[1]	(3,425)	[1]
Derivative Assets [Member]
Derivative [Line Items]
Derivative assets, Total assets	55	[1]	102	[1]
Derivative Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	55	[1]	102	[1]
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	1,495		1,637
Interest Rate Swap [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(165)	[1]	(290)	[1]
Interest Rate Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	46	[1]	94	[1]
Credit Default Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	23,954		47,320
Credit Default Swap [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(1,132)	[1]	(2,858)	[1]
Credit Default Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Insured Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	4,945		5,817
Insured Swaps [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(5)	[1]	(8)	[1]
Insured Swaps [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Non Insured Credit Default Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	0		10
Non Insured Credit Default Swaps [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	0	[1]
Non Insured Credit Default Swaps [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Non Insured Credit Default Swaps V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	0		0
Non Insured Credit Default Swaps V I E [Member] | Derivative Liabilities V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	0	[1]
Non Insured Credit Default Swaps V I E [Member] | Other Assets V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Interest Rate Swaps V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	0		2,728
Interest Rate Swaps V I E [Member] | Derivative Liabilities V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	(141)	[1]
Interest Rate Swaps V I E [Member] | Other Assets V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Interest Rate Swaps Embedded [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	496		483
Interest Rate Swaps Embedded [Member] | Medium Term Notes [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	9	[1]	8	[1]
Derivative Liabilities, Not designated, Fair Value	(19)	[1]	(35)	[1]
Currency Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	0		40
Currency Swap [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	(3)	[1]
Currency Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
Currency Swaps Vie [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	99		110
Currency Swaps Vie [Member] | Derivative Liabilities V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(11)	[1]	(21)	[1]
Currency Swaps Vie [Member] | Other Assets V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
All Other [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	36		195
All Other [Member] | Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	(15)	[1]	(68)	[1]
All Other [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
All Other V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	280		280
All Other V I E [Member] | Derivative Liabilities V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	0	[1]
All Other V I E [Member] | Other Assets V I E [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	0	[1]	0	[1]
All Other Embedded [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount	11		20
All Other Embedded [Member] | Derivative Liabilities Other Investments [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Not designated, Fair Value	0	[1]	(1)	[1]
All Other Embedded [Member] | Derivative Assets Other Investments [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Not designated, Fair Value	$ 0	[1]	$ 0	[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 determinedby the location of the related host contract.