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, 2014	Dec. 31, 2013
Summary of Investment Holdings [Line Items]
Amortized Cost	$ 15,507	$ 15,205
Fair Value	15,856	15,375
Percentage of Total Investment Portfolio, Amortized Cost	15.00%	15.00%
Percentage of Total Investment Portfolio, Fair Value	15.00%	15.00%
Fixed maturities:
Summary of Investment Holdings [Line Items]
Amortized Cost	12,664	12,427
Fair Value	13,069	12,637
Percentage of Total Investment Portfolio, Amortized Cost	12.00%	12.00%
Percentage of Total Investment Portfolio, Fair Value	12.00%	12.00%
Perpetual securities: | Upper Tier II:
Summary of Investment Holdings [Line Items]
Amortized Cost	1,967	1,920
Fair Value	1,965	1,913
Percentage of Total Investment Portfolio, Amortized Cost	2.00%	2.00%
Percentage of Total Investment Portfolio, Fair Value	2.00%	2.00%
Perpetual securities: | Tier I:
Summary of Investment Holdings [Line Items]
Amortized Cost	876	858
Fair Value	$ 822	$ 825
Percentage of Total Investment Portfolio, Amortized Cost	1.00%	1.00%
Percentage of Total Investment Portfolio, Fair Value	1.00%	1.00%