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INVESTMENTS - Composition of Investments in Unrealized Loss Position (Detail) | Sep. 30, 2016 | Dec. 31, 2015
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Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an 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 an Unrealized Loss Position | 92.00% | 97.00%
Percentage of Total Unrealized Losses | 85.00% | 95.00%
Perpetual securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 3.00%
Percentage of Total Unrealized Losses | 11.00% | 5.00%
Equity securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 0.00%
Percentage of Total Unrealized Losses | 4.00% | 0.00%
Japan government and agencies | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 0.00%
Percentage of Total Unrealized Losses | 2.00% | 0.00%
Municipalities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 1.00% | 0.00%
Percentage of Total Unrealized Losses | 1.00% | 0.00%
Mortgage- and asset-backed securities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 3.00% | 0.00%
Percentage of Total Unrealized Losses | 0.00% | 0.00%
Public utilities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 12.00% | 16.00%
Percentage of Total Unrealized Losses | 6.00% | 16.00%
Sovereign and supranational | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 2.00% | 3.00%
Percentage of Total Unrealized Losses | 1.00% | 1.00%
Banks/financial institutions | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 11.00% | 12.00%
Percentage of Total Unrealized Losses | 12.00% | 9.00%
Other corporate | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 59.00% | 66.00%
Percentage of Total Unrealized Losses | 63.00% | 69.00%
Investment Grade | Perpetual securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 100.00%
Investment Grade | Japan government and agencies | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 0.00%
Investment Grade | Municipalities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 0.00%
Investment Grade | Mortgage- and asset-backed securities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 0.00%
Investment Grade | Public utilities | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 88.00% | 93.00%
Investment Grade | Sovereign and supranational | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 100.00%
Investment Grade | Banks/financial institutions | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 38.00% | 59.00%
Investment Grade | Other corporate | Fixed maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 47.00% | 86.00%

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