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FAIR VALUE MEASUREMENTS - Fair Value Measurement Inputs and Valuation Techniques (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities [2] $ 82,296 [1],[3] $ 84,313 [4]
Available for sale securities, equity securities   1,023
Equity securities [2],[5] 1,059  
Asset derivatives 430 331
Liability derivatives 497 474
Assets, fair value disclosure 87,216 89,215
Liabilities, fair value disclosure 497 474
Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 490 414
Available for sale securities, equity securities   16
Equity securities 16  
Asset derivatives 190 151
Assets, fair value disclosure 696 581
Liabilities, fair value disclosure 101 128
Net asset value valuation technique    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale securities, equity securities   16
Equity securities 16  
Net asset value valuation technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale securities, equity securities   16
Equity securities 16  
Foreign currency swaps    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives 302 296
Liability derivatives 207 197
Foreign currency swaps | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives 190 150
Liability derivatives 101 128
Foreign currency swaps | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Discounted cash flow technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives 133 80
Liability derivatives 96 120
Foreign currency swaps | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Discounted cash flow technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives 57 70
Liability derivatives $ 5 $ 8
Foreign currency swaps | Credit Spread | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input 0.0012 0.0009
Derivative liability, measurement input 0.0031 0.0013
Foreign currency swaps | Credit Spread | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input 0.0101 0.0090
Derivative liability, measurement input 0.0196 0.0157
Credit default swaps    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives   $ 1
Credit default swaps | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives   1
Credit default swaps | Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Discounted cash flow technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Asset derivatives   $ 1
Credit default swaps | Credit Spread | Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input   0.0025
Credit default swaps | Base Correlation | Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [6]   0.4633
Credit default swaps | Base Correlation | Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [6]   0.4965
Credit default swaps | Recovery Rate | Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input   0.3724
Dollar-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities $ 35,460 $ 38,703
Available for sale securities, equity securities   $ 328
Equity securities $ 352  
Dollar-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [7] 0.0327 0.0240
Derivative liability, measurement input [7] 0.0327 0.0240
Dollar-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [7] 0.0330 0.0254
Derivative liability, measurement input [7] 0.0330 0.0254
Dollar-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [7] 0.0327 0.0240
Derivative liability, measurement input [7] 0.0327 0.0240
Dollar-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [7] 0.0330 0.0254
Derivative liability, measurement input [7] 0.0330 0.0254
Yen-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities $ 46,836 $ 45,610
Available for sale securities, equity securities   $ 695
Equity securities $ 707  
Yen-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [8] 0.0036 0.0026
Derivative liability, measurement input [8] 0.0036 0.0026
Yen-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [8] 0.0096 0.0085
Derivative liability, measurement input [8] 0.0096 0.0085
Yen-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Lower Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [8] 0.0036 0.0026
Derivative liability, measurement input [8] 0.0036 0.0026
Yen-denominated | Foreign currency swaps | Discount Rate | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Upper Limit | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Derivative asset, measurement input [8] 0.0096 0.0085
Derivative liability, measurement input [8] 0.0096 0.0085
Mortgage- and asset-backed securities    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities $ 333 $ 444
Mortgage- and asset-backed securities | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 172 175
Mortgage- and asset-backed securities | Consensus pricing valuation technique    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 172 175
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 172 175
Mortgage- and asset-backed securities | Dollar-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 161 173
Mortgage- and asset-backed securities | Yen-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 172 271
Banks/financial institutions    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 8,939 8,933
Banks/financial institutions | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 23 25
Banks/financial institutions | Consensus pricing valuation technique    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 23 25
Banks/financial institutions | Consensus pricing valuation technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 23 25
Banks/financial institutions | Dollar-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 3,179 3,433
Banks/financial institutions | Yen-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 5,760 5,500
Public utilities    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 7,313 7,954
Public utilities | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 104 68
Public utilities | Discounted cash flow technique    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 104 68
Public utilities | Discounted cash flow technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 104 68
Public utilities | Dollar-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 5,334 5,973
Public utilities | Yen-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 1,979 1,981
Other corporate    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 30,150 32,473
Other corporate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 191 146
Other corporate | Discounted cash flow technique    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 289 146
Other corporate | Discounted cash flow technique | Level 3    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 191 146
Other corporate | Dollar-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities 24,885 27,586
Other corporate | Yen-denominated    
Fair Value Measurement Inputs and Valuation Techniques    
Available for sale, fixed maturity securities $ 5,265 $ 4,887
[1] Includes perpetual securities ($1,408 at amortized cost and $1,591 at fair value)
[2] Includes perpetual securities
[3] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)
[4] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)
[5] Includes perpetual securities ($66 at fair value)
[6] Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices
[7] Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps
[8] Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps