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Derivative Instruments (Credit Derivatives Sold) (Detail) (Insurance Operations [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Total Notional Value of Credit Derivatives $ 50,256 $ 53,014
Total Fair Value of Credit Derivatives (3,006) (2,934)
Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Weighted Average Remaining Expected Maturity 4.9 Years 5.1 Years
Total Notional Value of Credit Derivatives 44,386 47,002
Total Fair Value of Credit Derivatives (2,960) (2,858)
Insured Swaps [Member]
    
Derivative [Line Items]    
Weighted Average Remaining Expected Maturity 19.2 Years 19.4 Years
Total Notional Value of Credit Derivatives 5,675 5,817
Total Fair Value of Credit Derivatives (8) (8)
All Other [Member]
    
Derivative [Line Items]    
Weighted Average Remaining Expected Maturity 32.6 Years 1.8 Years
Total Notional Value of Credit Derivatives 195 195
Total Fair Value of Credit Derivatives (38) (68)
AAA [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 10,007 10,457
Total Fair Value of Credit Derivatives (3) (7)
AAA [Member] | Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 10,007 10,457
AAA [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives      
AAA [Member] | All Other [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives      
AA [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 5,877 5,965
Total Fair Value of Credit Derivatives (83) (70)
AA [Member] | Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 5,792 5,862
AA [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 85 103
AA [Member] | All Other [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives      
A [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 6,741 8,914
Total Fair Value of Credit Derivatives (8) (72)
A [Member] | Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 3,109 5,253
A [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 3,632 3,661
A [Member] | All Other [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives      
BBB [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 13,208 13,553
Total Fair Value of Credit Derivatives (534) (732)
BBB [Member] | Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 11,250 11,571
BBB [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 1,958 1,982
BBB [Member] | All Other [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives      
Below Investment Grade [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 14,423 14,125
Total Fair Value of Credit Derivatives (2,378) (2,053)
Below Investment Grade [Member] | Insured Credit Default Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives 14,228 13,859
Below Investment Grade [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives    71
Below Investment Grade [Member] | All Other [Member]
    
Derivative [Line Items]    
Total Notional Value of Credit Derivatives $ 195 $ 195