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Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Available For Sale Securities [Abstract]    
Less than 12 months, fair value $ 1,006 $ 2,978
Less than 12 months, unrealized losses (84) (128)
12 months or longer, fair value 1,373 479
12 months or longer, unrealized losses (80) (101)
Total available-for-sale, fair value 2,379 3,457
Total available-for-sale, unrealized losses (164) (229)
Held To Maturity Securities [Abstract]    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 431 1,244
12 months or longer, unrealized losses (144) (181)
Total held-to-maturity, fair value 431 1,244
Total held-to-maturity, unrealized losses (144) (181)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Held To Maturity Securities [Abstract]    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 431 1,244
12 months or longer, unrealized losses (144) (181)
Total held-to-maturity, fair value 431 1,244
Total held-to-maturity, unrealized losses (144) (181)
Perpetual Debt And Equity Securities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 7 5
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 0 0
12 months or longer, unrealized losses 0 0
Total available-for-sale, fair value 7 5
Total available-for-sale, unrealized losses 0 0
Fixed Maturities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value   2,973
Less than 12 months, unrealized losses   (128)
12 months or longer, fair value   479
12 months or longer, unrealized losses   (101)
Total available-for-sale, fair value   3,452
Total available-for-sale, unrealized losses   (229)
Fixed Maturities [Member] | U S Treasury And Government [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 60 269
Less than 12 months, unrealized losses (1) (9)
12 months or longer, fair value 175 1
12 months or longer, unrealized losses (4) 0
Total available-for-sale, fair value 235 270
Total available-for-sale, unrealized losses (5) (9)
Fixed Maturities [Member] | US States And Political Subdivisions [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 146 1,112
Less than 12 months, unrealized losses (2) (65)
12 months or longer, fair value 351 49
12 months or longer, unrealized losses (13) (8)
Total available-for-sale, fair value 497 1,161
Total available-for-sale, unrealized losses (15) (73)
Fixed Maturities [Member] | Foreign Government Debt [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 62 36
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 0 0
12 months or longer, unrealized losses 0 0
Total available-for-sale, fair value 62 36
Total available-for-sale, unrealized losses 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 581 788
Less than 12 months, unrealized losses (81) (30)
12 months or longer, fair value 275 82
12 months or longer, unrealized losses (10) (8)
Total available-for-sale, fair value 856 870
Total available-for-sale, unrealized losses (91) (38)
Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 79 713
Less than 12 months, unrealized losses 0 (23)
12 months or longer, fair value 415 144
12 months or longer, unrealized losses (13) (8)
Total available-for-sale, fair value 494 857
Total available-for-sale, unrealized losses (13) (31)
Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 2 17
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 20 22
12 months or longer, unrealized losses (4) (5)
Total available-for-sale, fair value 22 39
Total available-for-sale, unrealized losses (4) (5)
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 7 11
Less than 12 months, unrealized losses 0 (1)
12 months or longer, fair value 7 0
12 months or longer, unrealized losses (1) 0
Total available-for-sale, fair value 14 11
Total available-for-sale, unrealized losses (1) (1)
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 1 6
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 86 124
12 months or longer, unrealized losses (22) (57)
Total available-for-sale, fair value 87 130
Total available-for-sale, unrealized losses (22) (57)
Fixed Maturities [Member] | Other Asset Backed [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 61 21
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 44 57
12 months or longer, unrealized losses (13) (15)
Total available-for-sale, fair value 105 78
Total available-for-sale, unrealized losses $ (13) $ (15)