INVESTMENTS - Composition of Investments in Unrealized Loss Position (Details)	Dec. 31, 2013	Dec. 31, 2012
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	100.00%	100.00%
Percentage of Total Unrealized Losses	100.00%	100.00%
Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	96.00%	96.00%
Percentage of Total Unrealized Losses	92.00%	89.00%
Perpetual securities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	4.00%	4.00%
Percentage of Total Unrealized Losses	8.00%	11.00%
Japan government and agencies | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	25.00%	43.00%
Percentage of Total Unrealized Losses	1.00%	9.00%
Public Utilities | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	13.00%	11.00%
Percentage of Total Unrealized Losses	12.00%	12.00%
Sovereign and Supranational | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	3.00%	3.00%
Percentage of Total Unrealized Losses	4.00%	6.00%
Banks/financial Institutions | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	14.00%	18.00%
Percentage of Total Unrealized Losses	22.00%	39.00%
Other Corporate | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage Of Total Investments In Unrealized Loss Position	41.00%	21.00%
Percentage of Total Unrealized Losses	53.00%	23.00%
Investment Grade | Perpetual securities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	90.00%	100.00%
Investment Grade | Japan government and agencies | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	100.00%	100.00%
Investment Grade | Public Utilities | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	98.00%	69.00%
Investment Grade | Sovereign and Supranational | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	100.00%	96.00%
Investment Grade | Banks/financial Institutions | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	64.00%	76.00%
Investment Grade | Other Corporate | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Securities Continuous Unrealized Loss Position Aggregate Losses Percentage Investment Grade or Below Investment Grade	91.00%	72.00%