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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 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Investments | [1] | $ 2,358 |  | $ 1,450
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 31,998 |  | 33,350
Securities held to maturity, fixed maturities, fair value |  | 38,599 |  | 40,021
Other investments carried at amortized cost |  | 2,011 | [2] | 1,174
Other investments carried at amortized cost, fair value |  | 2,000 | [2] | 1,142
Total financial instruments assets not carried at fair value |  | 34,009 |  | 34,524
Assets fair value disclosure financial instruments carried at cost |  | 40,599 |  | 41,163
Liabilities: |  |  |  |
Other policyholder funds |  | 6,967 |  | 6,659
Other policyholders' funds fair value disclosure |  | 6,849 |  | 6,540
Notes payable |  | 5,230 |  | 5,339
Notes payable fair value disclosure |  | 5,551 |  | 5,530
Total financial instrument liabilities not carried at fair value |  | 12,197 |  | 11,998
Liabilities fair value disclosure financial instruments carried at cost |  | 12,400 |  | 12,070
Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 38,599 |  | 40,021
Government and agencies | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 21,385 |  | 20,702
Securities held to maturity, fixed maturities, fair value |  | 26,455 |  | 26,040
Municipalities | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 359 |  | 350
Securities held to maturity, fixed maturities, fair value |  | 463 |  | 457
Mortgage- and asset-backed securities | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 27 |  | 30
Securities held to maturity, fixed maturities, fair value |  | 29 |  | 32
Public utilities | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 3,308 |  | 3,201
Securities held to maturity, fixed maturities, fair value |  | 3,734 |  | 3,536
Sovereign and supranational | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 1,527 |  | 2,602
Securities held to maturity, fixed maturities, fair value |  | 1,846 |  | 2,877
Banks/financial institutions | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 2,700 |  | 3,731
Securities held to maturity, fixed maturities, fair value |  | 2,887 |  | 3,900
Other corporate | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost |  | 2,692 |  | 2,734
Securities held to maturity, fixed maturities, fair value |  | 3,185 |  | 3,179
Policy loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Investments |  | 207 |  | 184
Equity method investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Investments |  | 83 |  |
Level 1 |  |  |  |
Assets: |  |  |  |
Other investments carried at amortized cost, fair value |  | 0 | [2] | 0
Assets fair value disclosure financial instruments carried at cost |  | 26,455 |  | 26,040
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure |  | 0 |  | 0
Notes payable fair value disclosure |  | 506 |  | 0
Liabilities fair value disclosure financial instruments carried at cost |  | 506 |  | 0
Level 1 | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 26,455 |  | 26,040
Level 1 | Government and agencies | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 26,455 |  | 26,040
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 |  |  |  |
Assets: |  |  |  |
Other investments carried at amortized cost, fair value |  | 15 | [2] | 0
Assets fair value disclosure financial instruments carried at cost |  | 12,139 |  | 13,959
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure |  | 0 |  | 0
Notes payable fair value disclosure |  | 4,780 |  | 0
Liabilities fair value disclosure financial instruments carried at cost |  | 4,780 |  | 0
Level 2 | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 12,124 |  | 13,959
Level 2 | 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 |  | 463 |  | 457
Level 2 | Mortgage- and asset-backed securities | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 9 |  | 10
Level 2 | Public utilities | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 3,734 |  | 3,536
Level 2 | Sovereign and supranational | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 1,846 |  | 2,877
Level 2 | Banks/financial institutions | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 2,887 |  | 3,900
Level 2 | Other corporate | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 3,185 |  | 3,179
Level 3 |  |  |  |
Assets: |  |  |  |
Other investments carried at amortized cost, fair value |  | 1,985 | [2] | 1,142
Assets fair value disclosure financial instruments carried at cost |  | 2,005 |  | 1,164
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure |  | 6,849 |  | 6,540
Notes payable fair value disclosure |  | 265 |  | 5,530
Liabilities fair value disclosure financial instruments carried at cost |  | 7,114 |  | 12,070
Level 3 | Fixed maturities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, fair value |  | 20 |  | 22
Level 3 | 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 |  | 20 |  | 22
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
[1] | Includes $1,500 in 2017 and $819 in 2016 of loan receivables and limited partnerships from consolidated variable interest entities
[2] | Excludes policy loans of $207 and equity method investments of $83, at carrying value

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