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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, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Cost or Amortized Cost | $ 45,204 | $ 54,426
Liabilities: |  |
Notes Payable | 4,276 | 4,343
Notes payable (excluding capital leases), fair value | 4,924 | 4,992
Obligation To Japanese Policyholder Protection Corporation Carrying Value | 2 | 23
Obligation to Japanese Policyholder Protection Corporation Fair Value Disclosure | 2 | 23
Total Financial Instrument Liabilities Not Carried At Fair Value | 4,278 | 4,366
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 4,926 | 5,015
Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 45,204 | 54,426
Held-to-maturity securities, fair value | 47,047 | 54,841
Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 24,606 | 32,043
Held-to-maturity securities, fair value | 26,760 | 32,332
Municipalities | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 452 | 492
Held-to-maturity securities, fair value | 517 | 520
Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 77 | 90
Held-to-maturity securities, fair value | 81 | 94
Public Utilities | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 4,532 | 4,924
Held-to-maturity securities, fair value | 4,512 | 5,051
Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 2,953 | 3,209
Held-to-maturity securities, fair value | 3,073 | 3,317
Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 8,480 | 9,211
Held-to-maturity securities, fair value | 7,953 | 8,991
Other Corporate | Fixed Maturities |  |
Assets: |  |
Cost or Amortized Cost | 4,104 | 4,457
Held-to-maturity securities, fair value | 4,151 | 4,536
Level 1 |  |
Liabilities: |  |
Notes payable (excluding capital leases), fair value | 0 | 0
Obligation to Japanese Policyholder Protection Corporation Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 0 | 0
Level 1 | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 26,760 | 32,332
Level 1 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 26,760 | 32,332
Level 1 | Municipalities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 1 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 1 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 1 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 1 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 1 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 2 |  |
Liabilities: |  |
Notes payable (excluding capital leases), fair value | 0 | 0
Obligation to Japanese Policyholder Protection Corporation Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 0 | 0
Level 2 | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 20,232 | 22,445
Level 2 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 2 | Municipalities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 517 | 520
Level 2 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 26 | 30
Level 2 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 4,512 | 5,051
Level 2 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 3,073 | 3,317
Level 2 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 7,953 | 8,991
Level 2 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 4,151 | 4,536
Level 3 |  |
Liabilities: |  |
Notes payable (excluding capital leases), fair value | 4,924 | 4,992
Obligation to Japanese Policyholder Protection Corporation Fair Value Disclosure | 2 | 23
Liabilities Fair Value Disclosure Financial Instruments Carried At Cost | 4,926 | 5,015
Level 3 | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 55 | 64
Level 3 | Japan government and agencies | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 3 | Municipalities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 3 | Mortgage- and asset-backed Securities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 55 | 64
Level 3 | Public Utilities | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 3 | Sovereign and Supranational | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 3 | Banks/financial Institutions | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | 0 | 0
Level 3 | Other Corporate | Fixed Maturities |  |
Assets: |  |
Held-to-maturity securities, fair value | $ 0 | $ 0

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