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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
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments $ 35,022 $ 58,640
Notional Amount Outstanding, Total derivatives 35,022 58,640
Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (1,913) [1] (3,425) [1]
Derivative liabilities, Total derivatives (1,913) [1] (3,425) [1]
Derivative Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 71 [1] 102 [1]
Derivative assets, Total assets 71 [1] 102 [1]
Interest Rate Swap [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 1,601 1,637
Interest Rate Swap [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (209) [1] (290) [1]
Interest Rate Swap [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 62 [1] 94 [1]
Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 26,826 47,320
Credit Default Swap [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (1,641) [1] (2,858) [1]
Credit Default Swap [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 5,539 5,817
Insured Swaps [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (7) [1] (8) [1]
Insured Swaps [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Non Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 5 10
Non Insured Credit Default Swaps [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value 0 [1] 0 [1]
Non Insured Credit Default Swaps [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Non Insured Credit Default Swaps V I E [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 0 0
Non Insured Credit Default Swaps V I E [Member] | Derivative Liabilities V I E [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]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Interest Rate Swaps V I E [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 127 2,728
Interest Rate Swaps V I E [Member] | Derivative Liabilities V I E [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (2) [1] (141) [1]
Interest Rate Swaps V I E [Member] | Other Assets V I E [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Interest Rate Swaps Embedded [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 472 483
Interest Rate Swaps Embedded [Member] | Medium Term Notes [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 8 [1] 8 [1]
Derivative Liabilities, Not designated, Fair Value (30) [1] (35) [1]
Currency Swap [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 19 40
Currency Swap [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (1) [1] (3) [1]
Currency Swap [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
Currency Swaps Vie [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 104 110
Currency Swaps Vie [Member] | Derivative Liabilities V I E [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (16) [1] (21) [1]
Currency Swaps Vie [Member] | Other Assets V I E [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
All Other [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 36 195
All Other [Member] | Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value (7) [1] (68) [1]
All Other [Member] | Other Assets [Member]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 0 [1] 0 [1]
All Other V I E [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 280 280
All Other V I E [Member] | Derivative Liabilities V I E [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]
    
Derivative [Line Items]    
Derivative Assets, Not designated, Fair Value 1 [1] 0 [1]
All Other Embedded [Member]
    
Derivative [Line Items]    
Derivative Instruments, Not designated as hedging instruments 13 20
All Other Embedded [Member] | Derivative Liabilities Other Investments [Member]
    
Derivative [Line Items]    
Derivative Liabilities, Not designated, Fair Value 0 [1] (1) [1]
All Other Embedded [Member] | Derivative Assets Other Investments [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.