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FAIR VALUE MEASUREMENTS Fair Value Inputs Assets Quantitative Information (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 83,799 | $ 67,794
Asset derivatives |  | 1,662 | 676
Assets, fair value |  | $ 91,030 | $ 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 |  | $ 269 | $ 249
Asset derivatives |  | 168 | 102
Assets, fair value |  | 437 | 351
Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 80,527 | 65,349
Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 266 | 246
Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,994 | 1,947
Perpetual securities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 0 | 0
Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,278 | 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 |  | 807 | 677
Equity securities | Assets | Weighted Average | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Offered Quotes |  | $ 9 | $ 7
Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 1,228 | $ 582
Mortgage- and asset-backed securities | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 240 | 220
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 240 | 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 |  | 240 | 220
Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 6,344 | 6,019
Banks/financial institutions | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 26 | 26
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 26 | 26
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 26 | 26
Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,768 | 1,742
Banks/financial institutions | Perpetual securities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 0 | 0
Foreign currency swaps |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 460 | 563
Foreign currency swaps | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 165 | 101
Credit default swaps |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 3 | 1
Credit default swaps | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 3 | 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 |  | $ 40 | $ 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] | 20.97% | 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 |  | 0.14% | 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 |  | 1.73% | 1.47%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Discounted cash flow valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | $ 58 |
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Lower Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Entity Credit Risk |  | 0.39% |
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Upper Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Entity Credit Risk |  | 2.21% |
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 |  | $ 67 | $ 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] | 20.97% | 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 |  | $ 3 | $ 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 |  | 0.63% | 1.23%
Fair Value Inputs, Recovery Rate |  | 36.60% | 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] | 50.35% | 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] | 55.79% | 58.40%
Dollar-denominated | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 41,046 | $ 36,838
Dollar-denominated | Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 564 | 11
Dollar-denominated | Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 217 | 227
Dollar-denominated | Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 3,280 | 3,478
Dollar-denominated | Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 77 | $ 111
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 | [3] | 1.46% | 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 | [3] | 1.78% | 2.62%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Lower Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Discount Rate | [3] | 1.46% |
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Upper Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Discount Rate | [3] | 1.78% |
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 | [3] | 1.46% | 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 | [3] | 1.78% | 2.62%
Yen-denominated | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 39,481 | $ 28,511
Yen-denominated | Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 714 | 487
Yen-denominated | Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,011 | 355
Yen-denominated | Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 3,064 | 2,541
Yen-denominated | Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 1,691 | $ 1,631
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 | [4] | 0.05% | 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 | [4] | 0.46% | 1.22%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Lower Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Discount Rate | [4] | 0.05% |
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY), and CDS Spread | Foreign currency swaps | Assets | Upper Limit | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Discount Rate | [4] | 0.46% |
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 | [4] | 0.05% | 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 | [4] | 0.46% | 1.22%
[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 U.S. long-term rates to accommodate long maturity nature of our swaps
[4] | Inputs derived from Japan long-term rates to accommodate long maturity nature of our swaps

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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