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Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Available For Sale Securities [Abstract]    
Less than 12 months, fair value $ 1,547 $ 851
Less than 12 months, unrealized losses (25) (2)
12 months or longer, fair value 472 1,220
12 months or longer, unrealized losses (133) (145)
Total available-for-sale, fair value 2,019 2,071
Total available-for-sale, unrealized losses (158) (147)
Held To Maturity Securities [Abstract]    
Less than 12 months, fair value 1,096 0
Less than 12 months, unrealized losses (23) 0
12 months or longer, fair value 321 373
12 months or longer, unrealized losses (254) (202)
Total held-to-maturity, fair value 1,417 373
Total held-to-maturity, unrealized losses (277) (202)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Less than 12 months, fair value 1,096 0
Less than 12 months, unrealized losses (23) 0
12 months or longer, fair value 321 373
12 months or longer, unrealized losses (254) (202)
Total held-to-maturity, fair value 1,417 373
Total held-to-maturity, unrealized losses (277) (202)
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 2 6
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 2 0
12 months or longer, unrealized losses 0 0
Total available-for-sale, fair value 4 6
Total available-for-sale, unrealized losses 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 1,545 845
Less than 12 months, unrealized losses (25) (2)
12 months or longer, fair value 470 1,220
12 months or longer, unrealized losses (133) (145)
Total available-for-sale, fair value 2,015 2,065
Total available-for-sale, unrealized losses (158) (147)
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 136 197
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 50 175
12 months or longer, unrealized losses 0 (3)
Total available-for-sale, fair value 186 372
Total available-for-sale, unrealized losses (1) (3)
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 351 60
Less than 12 months, unrealized losses (7) (1)
12 months or longer, fair value 42 257
12 months or longer, unrealized losses (4) (7)
Total available-for-sale, fair value 393 317
Total available-for-sale, unrealized losses (11) (8)
Fixed Maturities [Member] | Foreign Government Debt [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 21 20
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 3 0
12 months or longer, unrealized losses (1) 0
Total available-for-sale, fair value 24 20
Total available-for-sale, unrealized losses (2) 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 539 468
Less than 12 months, unrealized losses (13) (1)
12 months or longer, fair value 71 251
12 months or longer, unrealized losses (91) (91)
Total available-for-sale, fair value 610 719
Total available-for-sale, unrealized losses (104) (92)
Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 264 16
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 181 387
12 months or longer, unrealized losses (4) (7)
Total available-for-sale, fair value 445 403
Total available-for-sale, unrealized losses (5) (7)
Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 24 10
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 18 19
12 months or longer, unrealized losses (4) (4)
Total available-for-sale, fair value 42 29
Total available-for-sale, unrealized losses (5) (4)
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 7 4
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 1 6
12 months or longer, unrealized losses 0 0
Total available-for-sale, fair value 8 10
Total available-for-sale, unrealized losses 0 0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0 1
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 61 81
12 months or longer, unrealized losses (20) (21)
Total available-for-sale, fair value 61 82
Total available-for-sale, unrealized losses (20) (21)
Fixed Maturities [Member] | Other Asset Backed [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 203 69
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 43 44
12 months or longer, unrealized losses (9) (12)
Total available-for-sale, fair value 246 113
Total available-for-sale, unrealized losses $ (10) $ (12)