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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | $ 40,858 | $ 44,415
Securities held to maturity, fixed maturities, fair value | 42,816 | 45,846
Liabilities |  |
Other policyholder funds | 6,547 | 5,861
Other policyholders' funds fair value disclosure | 6,391 | 5,715
Notes Payable | 4,908 | 4,891
Notes Payable, Fair Value Disclosure | 5,389 | 5,241
Total Financial Instrument Liabilities Not Carried At Fair Value | 11,455 | 10,752
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 11,780 | 10,956
Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 40,858 | 44,415
Securities held to maturity, fixed maturities, fair value | 42,816 | 45,846
Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 23,461 | 27,362
Securities held to maturity, fixed maturities, fair value | 25,129 | 28,708
Municipalities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 409 | 399
Securities held to maturity, fixed maturities, fair value | 455 | 440
Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 58 | 58
Securities held to maturity, fixed maturities, fair value | 61 | 61
Public Utilities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 3,993 | 3,900
Securities held to maturity, fixed maturities, fair value | 4,075 | 3,928
Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 3,011 | 2,941
Securities held to maturity, fixed maturities, fair value | 3,118 | 3,040
Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 6,398 | 6,310
Securities held to maturity, fixed maturities, fair value | 6,277 | 6,128
Other Corporate | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, amortized cost | 3,528 | 3,445
Securities held to maturity, fixed maturities, fair value | 3,701 | 3,541
Level 1 |  |
Liabilities |  |
Other policyholders' funds fair value disclosure | 0 | 0
Notes Payable, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 0 | 0
Level 1 | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 25,129 | 28,708
Level 1 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 25,129 | 28,708
Level 1 | Municipalities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 1 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 1 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 1 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 1 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 1 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 2 |  |
Liabilities |  |
Other policyholders' funds fair value disclosure | 0 | 0
Notes Payable, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 0 | 0
Level 2 | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 17,646 | 17,097
Level 2 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 2 | Municipalities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 455 | 440
Level 2 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 20 | 20
Level 2 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 4,075 | 3,928
Level 2 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 3,118 | 3,040
Level 2 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 6,277 | 6,128
Level 2 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 3,701 | 3,541
Level 3 |  |
Liabilities |  |
Other policyholders' funds fair value disclosure | 6,391 | 5,715
Notes Payable, Fair Value Disclosure | 5,389 | 5,241
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 11,780 | 10,956
Level 3 | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 41 | 41
Level 3 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 3 | Municipalities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 3 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 41 | 41
Level 3 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 3 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 3 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | 0 | 0
Level 3 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Securities held to maturity, fixed maturities, fair value | $ 0 | $ 0

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