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INVESTMENTS - Total Investments in Bank and Financial Institution Sector, Including those Classified as Perpetual Securities (Detail) (Banks/financial Institutions, USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Amortized Cost | $ 18,358 | $ 20,196
Fair Value | 17,839 | 20,575
Percentage of Total Investment Portfolio, Amortized Cost | 18.00% | 18.00%
Percentage of Total Investment Portfolio, Fair Value | 17.00% | 18.00%
Fixed Maturities |  |
Summary of Investment Holdings [Line Items] |  |
Amortized Cost | 15,010 | 16,292
Fair Value | 14,924 | 16,625
Percentage of Total Investment Portfolio, Amortized Cost | 15.00% | 14.00%
Percentage of Total Investment Portfolio, Fair Value | 14.00% | 14.00%
Perpetual Securities | Upper Tier II |  |
Summary of Investment Holdings [Line Items] |  |
Amortized Cost | 2,340 | 2,825
Fair Value | 2,059 | 2,919
Percentage of Total Investment Portfolio, Amortized Cost | 2.00% | 3.00%
Percentage of Total Investment Portfolio, Fair Value | 2.00% | 3.00%
Perpetual Securities | Tier I |  |
Summary of Investment Holdings [Line Items] |  |
Amortized Cost | 1,008 | 1,079
Fair Value | $ 856 | $ 1,031
Percentage of Total Investment Portfolio, Amortized Cost | 1.00% | 1.00%
Percentage of Total Investment Portfolio, Fair Value | 1.00% | 1.00%

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