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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
Jun. 30, 2013
Dec. 31, 2012
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value $ 2,546 $ 702
Less than 12 Months, Unrealized Losses (94) (4)
12 Months or Longer, Fair Value 347 582
12 Months or Longer, Unrealized Losses (101) (148)
Total Available-For-Sale, Fair Value 2,893 1,284
Total Available-For-Sale, Unrealized Losses (195) (152)
Held To Maturity Securities [Abstract]    
Less than 12 Months, Fair Value 306 297
Less than 12 Months, Unrealized Losses (10) (19)
12 Months or Longer, Fair Value 1,304 1,287
12 Months or Longer, Unrealized Losses (121) (138)
Total Held-To-Maturity, Fair Value 1,610 1,584
Total Held-To-Maturity, Unrealized Loss (131) (157)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or Longer, Fair Value   31
12 Months or Longer, Unrealized Losses   (6)
Total Available-For-Sale, Fair Value   31
Total Available-For-Sale, Unrealized Losses   (6)
Held To Maturity Securities [Abstract]    
Less than 12 Months, Fair Value 306 297
Less than 12 Months, Unrealized Losses (10) (19)
12 Months or Longer, Fair Value 1,304 1,287
12 Months or Longer, Unrealized Losses (121) (138)
Total Held-To-Maturity, Fair Value 1,610 1,584
Total Held-To-Maturity, Unrealized Loss (131) (157)
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or Longer, Fair Value   82
12 Months or Longer, Unrealized Losses   (10)
Total Available-For-Sale, Fair Value   82
Total Available-For-Sale, Unrealized Losses   (10)
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or Longer, Fair Value   85
12 Months or Longer, Unrealized Losses   (8)
Total Available-For-Sale, Fair Value   85
Total Available-For-Sale, Unrealized Losses   (8)
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or Longer, Fair Value   0
12 Months or Longer, Unrealized Losses   0
Total Available-For-Sale, Fair Value   0
Total Available-For-Sale, Unrealized Losses   0
Perpetual Debt And Equity Securities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 6 1
Less than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 0 1
12 Months or Longer, Unrealized Losses 0 0
Total Available-For-Sale, Fair Value 6 2
Total Available-For-Sale, Unrealized Losses 0 0
Fixed Maturities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 2,540 701
Less than 12 Months, Unrealized Losses (94) (4)
12 Months or Longer, Fair Value 347 383
12 Months or Longer, Unrealized Losses (101) (124)
Total Available-For-Sale, Fair Value 2,887 1,084
Total Available-For-Sale, Unrealized Losses (195) (128)
Fixed Maturities [Member] | U S Treasury And Government [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 690 234
Less than 12 Months, Unrealized Losses (8) (1)
12 Months or Longer, Fair Value 1 0
12 Months or Longer, Unrealized Losses 0 0
Total Available-For-Sale, Fair Value 691 234
Total Available-For-Sale, Unrealized Losses (8) (1)
Fixed Maturities [Member] | State And Municipal Bonds [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 696 69
Less than 12 Months, Unrealized Losses (40) 0
12 Months or Longer, Fair Value 60 87
12 Months or Longer, Unrealized Losses (3) (12)
Total Available-For-Sale, Fair Value 756 156
Total Available-For-Sale, Unrealized Losses (43) (12)
Fixed Maturities [Member] | Foreign Government Debt [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 12 11
Less than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 0 1
12 Months or Longer, Unrealized Losses 0 0
Total Available-For-Sale, Fair Value 12 12
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 519 202
Less than 12 Months, Unrealized Losses (24) (2)
12 Months or Longer, Fair Value 47 57
12 Months or Longer, Unrealized Losses (14) (18)
Total Available-For-Sale, Fair Value 566 259
Total Available-For-Sale, Unrealized Losses (38) (20)
Fixed Maturities [Member] | Residential Mortgage Backed Agency [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 556 173
Less than 12 Months, Unrealized Losses (21) (1)
12 Months or Longer, Fair Value 33 38
12 Months or Longer, Unrealized Losses 0 0
Total Available-For-Sale, Fair Value 589 211
Total Available-For-Sale, Unrealized Losses (21) (1)
Fixed Maturities [Member] | Residential Mortgage Backed Non Agency [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 5 4
Less than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 20 28
12 Months or Longer, Unrealized Losses (6) (8)
Total Available-For-Sale, Fair Value 25 32
Total Available-For-Sale, Unrealized Losses (6) (8)
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 25 3
Less than 12 Months, Unrealized Losses (1) 0
12 Months or Longer, Fair Value 0 27
12 Months or Longer, Unrealized Losses 0 (4)
Total Available-For-Sale, Fair Value 25 30
Total Available-For-Sale, Unrealized Losses (1) (4)
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 14 1
Less than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 124 80
12 Months or Longer, Unrealized Losses (66) (71)
Total Available-For-Sale, Fair Value 138 81
Total Available-For-Sale, Unrealized Losses (66) (71)
Fixed Maturities [Member] | Other Asset Backed [Member]
    
Available For Sale Securities [Abstract]    
Less than 12 Months, Fair Value 23 4
Less than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 62 65
12 Months or Longer, Unrealized Losses (12) (11)
Total Available-For-Sale, Fair Value 85 69
Total Available-For-Sale, Unrealized Losses $ (12) $ (11)