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Derivative Instruments (Credit Derivatives Sold) (Detail) (Insurance Operations [Member], USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative notional amount $ 15,387 $ 28,935
Total fair value of credit derivatives (288) (1,152)
Credit Default Swap [Member]
    
Derivative [Line Items]    
Weighted average remaining expected maturity 1 year 10 months 24 days 2 years 7 months 6 days
Derivative notional amount 11,276 23,954
Total fair value of credit derivatives (284) (1,132)
Insured Swaps [Member]
    
Derivative [Line Items]    
Weighted average remaining expected maturity 16 years 4 months 24 days 18 years 6 months 0 days
Derivative notional amount 4,111 4,945
Total fair value of credit derivatives (4) (5)
Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Weighted average remaining expected maturity   28 years 0 months 0 days
Derivative notional amount 0 36
Total fair value of credit derivatives 0 (15)
Credit Rating Aaa [Member]
    
Derivative [Line Items]    
Derivative notional amount 6,926 7,406
Total fair value of credit derivatives (2) (2)
Credit Rating Aaa [Member] | Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative notional amount 6,926 7,406
Credit Rating Aaa [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aaa [Member] | Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aa [Member]
    
Derivative [Line Items]    
Derivative notional amount 584 2,049
Total fair value of credit derivatives 0 0
Credit Rating Aa [Member] | Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative notional amount 435 1,972
Credit Rating Aa [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative notional amount 149 77
Credit Rating Aa [Member] | Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating A [Member]
    
Derivative [Line Items]    
Derivative notional amount 3,933 4,350
Total fair value of credit derivatives (2) (3)
Credit Rating A [Member] | Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative notional amount 968 1,068
Credit Rating A [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative notional amount 2,965 3,282
Credit Rating A [Member] | Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Bbb [Member]
    
Derivative [Line Items]    
Derivative notional amount 1,177 9,138
Total fair value of credit derivatives (2) (78)
Credit Rating Bbb [Member] | Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative notional amount 201 7,552
Credit Rating Bbb [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative notional amount 976 1,586
Credit Rating Bbb [Member] | Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Below Investment Grade [Member]
    
Derivative [Line Items]    
Derivative notional amount 2,767 5,992
Total fair value of credit derivatives (282) (1,069)
Credit Rating Below Investment Grade [Member] | Credit Default Swap [Member]
    
Derivative [Line Items]    
Derivative notional amount 2,746 5,956
Credit Rating Below Investment Grade [Member] | Insured Swaps [Member]
    
Derivative [Line Items]    
Derivative notional amount 21 0
Credit Rating Below Investment Grade [Member] | Other Credit Derivatives [Member]
    
Derivative [Line Items]    
Derivative notional amount $ 0 $ 36