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Investments (Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investment [Line Items]    
Held to maturity, Amortized Cost $ 7,548 $ 6,098
Held to maturity, Gross Unrealized Appreciation 228 187
Held to maturity, Gross Unrealized Depreciation (13) (22)
Held to maturity, Fair Value 7,763 6,263
Held to maturity, OTTI recognized in AOCI      
Available for sale, Amortized Cost 47,688 48,406
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 1,703 1,465
Available for sale, Gross Unrealized Depreciation (243) (617)
Available for sale, Fair Value 49,148 49,254
Available for sale, OTTI recognized in AOCI (4) (40)
U.S. Treasury And Agency [Member]
   
Investment [Line Items]    
Held to maturity, Amortized Cost 804 820
Held to maturity, Gross Unrealized Appreciation 16 16
Held to maturity, Gross Unrealized Depreciation (3) (4)
Held to maturity, Fair Value 817 832
Held to maturity, OTTI recognized in AOCI 0 0
Available for sale, Amortized Cost 2,627 2,946
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 70 62
Available for sale, Gross Unrealized Depreciation (19) (59)
Available for sale, Fair Value 2,678 2,949
Available for sale, OTTI recognized in AOCI 0 0
Foreign [Member]
   
Investment [Line Items]    
Held to maturity, Amortized Cost 937 864
Held to maturity, Gross Unrealized Appreciation 42 33
Held to maturity, Gross Unrealized Depreciation (1) 0
Held to maturity, Fair Value 978 897
Held to maturity, OTTI recognized in AOCI 0 0
Available for sale, Amortized Cost 14,741 14,336
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 542 377
Available for sale, Gross Unrealized Depreciation (52) (122)
Available for sale, Fair Value 15,231 14,591
Available for sale, OTTI recognized in AOCI (1) 0
Corporate Securities [Member]
   
Investment [Line Items]    
Held to maturity, Amortized Cost 2,443 1,922
Held to maturity, Gross Unrealized Appreciation 86 83
Held to maturity, Gross Unrealized Depreciation (4) 0
Held to maturity, Fair Value 2,525 2,005
Held to maturity, OTTI recognized in AOCI 0 0
Available for sale, Amortized Cost 16,715 16,825
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 716 777
Available for sale, Gross Unrealized Depreciation (93) (132)
Available for sale, Fair Value 17,338 17,470
Available for sale, OTTI recognized in AOCI (2) (6)
Mortgage Backed-Securities [Member]
   
Investment [Line Items]    
Held to maturity, Amortized Cost 2,087 1,341
Held to maturity, Gross Unrealized Appreciation 46 39
Held to maturity, Gross Unrealized Depreciation (3) (1)
Held to maturity, Fair Value 2,130 1,379
Held to maturity, OTTI recognized in AOCI 0 0
Available for sale, Amortized Cost 10,159 10,937
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 237 184
Available for sale, Gross Unrealized Depreciation (72) (227)
Available for sale, Fair Value 10,324 10,894
Available for sale, OTTI recognized in AOCI (1) (34)
States, Municipalities, And Political Subdivisions [Member]
   
Investment [Line Items]    
Held to maturity, Amortized Cost 1,277 1,151
Held to maturity, Gross Unrealized Appreciation 38 16
Held to maturity, Gross Unrealized Depreciation (2) (17)
Held to maturity, Fair Value 1,313 1,150
Held to maturity, OTTI recognized in AOCI 0 0
Available for sale, Amortized Cost 3,446 3,362
AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 138 65
Available for sale, Gross Unrealized Depreciation (7) (77)
Available for sale, Fair Value 3,577 3,350
Available for sale, OTTI recognized in AOCI $ 0 $ 0