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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)

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