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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, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 83,206 | $ 76,702
Asset derivatives |  | 479 | 1,207
Assets, fair value |  | $ 88,669 | $ 83,044
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 |  | $ 400 | $ 242
Asset derivatives |  | 148 | 127
Assets, fair value |  | 548 | 369
Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 80,415 | 73,760
Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 382 | 239
Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,863 | 1,633
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 |  | 928 | 1,309
Equity securities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 18 | 3
Equity securities | Net asset value valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 18 | 3
Equity securities | Net asset value valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 18 | $ 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 |  | 724 | 701
Equity securities | Assets | Weighted Average | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value Inputs, Offered Quotes |  | $ 6 | $ 8
Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 456 | $ 1,337
Mortgage- and asset-backed securities | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 178 | 198
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 178 | 198
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 |  | 178 | 198
Public utilities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 8,015 | 7,683
Public utilities | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 77 | 16
Public utilities | Fixed maturities | Discounted cash flow valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 77 | 16
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 77 | 16
Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 7,010 | 6,063
Banks/financial institutions | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 25 | 25
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 25 | 25
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 25 | 25
Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,627 | 1,420
Banks/financial institutions | Perpetual securities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 0 | 0
Other corporate | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 31,575 | 29,699
Other corporate | Fixed maturities | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 102 | 0
Other corporate | Fixed maturities | Discounted cash flow valuation technique |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 102 |
Other corporate | Fixed maturities | Discounted cash flow valuation technique | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 102 |
Other corporate | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 236 | 213
Other corporate | 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 |  | 301 | 490
Foreign currency swaps | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 147 | 125
Credit default swaps |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 1 | 2
Credit default swaps | Level 3 |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Asset derivatives |  | 1 | 2
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 |  | $ 27 | $ 16
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] | 21.00% | 21.47%
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 |  | 0.11% | 0.17%
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 |  | 1.16% | 1.72%
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 |  | $ 45 | $ 29
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 |  | 0.11% | 0.16%
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 |  | 0.83% | 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 |  | $ 75 | $ 80
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] | 21.00% | 21.47%
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 |  | $ 1 | $ 2
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 |  | 0.19% | 0.54%
Fair Value Inputs, Recovery Rate |  | 37.24% | 36.69%
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] | 62.73% | 52.18%
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] | 66.88% | 56.07%
Dollar-denominated | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 38,017 | $ 36,611
Dollar-denominated | Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 280 | 604
Dollar-denominated | Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 179 | 216
Dollar-denominated | Public utilities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 6,010 | 5,835
Dollar-denominated | Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 3,268 | 3,061
Dollar-denominated | Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 74 | 75
Dollar-denominated | Other corporate | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 27,018 | $ 25,887
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] | 2.29% | 2.34%
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] | 2.53% | 2.59%
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] | 2.29% | 2.34%
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] | 2.53% | 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 | [3] | 2.29% | 2.34%
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] | 2.53% | 2.59%
Yen-denominated | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 42,398 | $ 37,149
Yen-denominated | Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 648 | 705
Yen-denominated | Mortgage- and asset-backed securities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 277 | 1,121
Yen-denominated | Public utilities | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 2,005 | 1,848
Yen-denominated | Banks/financial institutions | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 3,742 | 3,002
Yen-denominated | Banks/financial institutions | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 1,553 | 1,345
Yen-denominated | Other corporate | Fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | 4,557 | 3,812
Yen-denominated | Other corporate | Perpetual securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Available-for-sale Securities |  | $ 236 | $ 213
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] | 0.26% | 0.22%
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] | 0.86% | 0.80%
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] | 0.26% | 0.22%
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] | 0.86% | 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 | [4] | 0.26% | 0.22%
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] | 0.86% | 0.80%
[1] | Based on 10 year volatility of JPY/USD exchange rate
[2] | Range of base correlation for the Company's 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 the Company's swaps
[4] | Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's 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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + 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=77997519&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=77997519&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=82849420&loc=SL20226008-175313 + Details
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