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FAIR VALUE MEASUREMENTS - Fair Value Inputs Assets Quantitative Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 76,702 $ 67,794
Asset derivatives 1,207 676
Assets, fair value $ 83,044 $ 72,996
Length of Volatility of Japanese Yen to US Dollar Exchange Rate 10 years 10 years
Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 242 $ 249
Asset derivatives 127 102
Assets, fair value 369 351
Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 73,760 65,349
Fixed maturities | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 239 246
Equity securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 1,309 498
Equity securities | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 3 3
Equity securities | Net asset value valuation technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 3 3
Equity securities | Net asset value valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 3 $ 3
Equity securities | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Offered Quotes $ 1 $ 1
Equity securities | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Offered Quotes 701 677
Equity securities | Assets | Weighted Average | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Offered Quotes $ 8 $ 7
Mortgage- and asset-backed securities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 1,337 $ 582
Mortgage- and asset-backed securities | Fixed maturities | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 198 220
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 198 220
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 198 220
Public utilities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 7,683 7,479
Public utilities | Fixed maturities | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 16 0
Public utilities | Fixed maturities | Discounted cash flow valuation technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 16  
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 16  
Banks/financial institutions | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 6,063 6,019
Banks/financial institutions | Fixed maturities | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 25 26
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 25 26
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 25 26
Foreign currency swaps    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives 490 563
Foreign currency swaps | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives 125 101
Credit default swaps    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives 2 1
Credit default swaps | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives 2 1
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Discounted cash flow valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives $ 16 $ 7
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Foreign Exchange Rates [1] 21.47% 20.05%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 0.17% 0.32%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 1.72% 1.47%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Discounted cash flow valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives $ 29  
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 0.16%  
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 0.88%  
Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Discounted cash flow valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives $ 80 $ 94
Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Assets | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Foreign Exchange Rates [1] 21.47% 20.05%
Fair value, unobservable input, base correlation, CDS spreads, recovery rate | Credit default swaps | Discounted cash flow valuation technique | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset derivatives $ 2 $ 1
Fair value, unobservable input, base correlation, CDS spreads, recovery rate | Credit default swaps | Assets | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 0.54% 1.23%
Fair Value Inputs, Recovery Rate 36.69% 36.87%
Fair value, unobservable input, base correlation, CDS spreads, recovery rate | Credit default swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Base Correlation [2] 52.18% 53.26%
Fair value, unobservable input, base correlation, CDS spreads, recovery rate | Credit default swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Base Correlation [2] 56.07% 58.40%
Yen-denominated | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 37,149 $ 28,511
Yen-denominated | Equity securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 705 487
Yen-denominated | Mortgage- and asset-backed securities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 1,121 355
Yen-denominated | Public utilities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 1,848 1,600
Yen-denominated | Banks/financial institutions | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 3,002 $ 2,541
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.22% 0.42%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.80% 1.22%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.22%  
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.80%  
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.22% 0.42%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [3] 0.80% 1.22%
Dollar-denominated | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 36,611 $ 36,838
Dollar-denominated | Equity securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 604 11
Dollar-denominated | Mortgage- and asset-backed securities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 216 227
Dollar-denominated | Public utilities | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities 5,835 5,879
Dollar-denominated | Banks/financial institutions | Fixed maturities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale securities $ 3,061 $ 3,478
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.34% 2.20%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), CDS Spreads and Foreign Exchange Rates | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.59% 2.62%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.34%  
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.59%  
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Assets | Lower Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.34% 2.20%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), interest rates (JPY), and Foreign Exchange Rates | Foreign currency swaps | Assets | Upper Limit | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate [4] 2.59% 2.62%
[1] Based on 10 year volatility of JPY/USD exchange rate
[2] Range of base correlation for our bespoke tranche for attachment and detachment points corresponding to market indices
[3] Inputs derived from Japan long-term rates to accommodate long maturity nature of our swaps
[4] Inputs derived from U.S. long-term rates to accommodate long maturity nature of our swaps