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FAIR VALUE MEASUREMENTS Fair Value Inputs Assets Quantitative Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | $ 67,318 |  | $ 61,038 |
Asset derivatives | 523 |  | 488 |
Assets, fair value | 69,835 |  | 64,069 |
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 | 346 |  | 447 |
Asset derivatives | 107 |  | 106 |
Assets, fair value | 453 |  | 553 |
Fixed Maturities |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 64,281 |  | 58,070 |
Fixed Maturities | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 287 |  | 392 |
Perpetual securities: |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 3,016 |  | 2,947 |
Perpetual securities: | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 56 |  | 52 |
Equity Securities |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 21 |  | 21 |
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 | $ 793 |  | $ 774 |
Equity Securities | Assets | Weighted Average | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Offered Quotes | $ 7 |  | $ 7 |
Mortgage- and asset-backed Securities | Fixed Maturities |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 666 |  | 771 |
Mortgage- and asset-backed Securities | Fixed Maturities | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 262 |  | 369 |
Mortgage- and asset-backed Securities | Fixed Maturities | Consensus Pricing Valuation Technique |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 262 |  | 369 |
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 | 262 |  | 369 |
Banks/financial Institutions | Fixed Maturities |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 6,792 |  | 6,509 |
Banks/financial Institutions | Fixed Maturities | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 25 |  | 23 |
Banks/financial Institutions | Fixed Maturities | Consensus Pricing Valuation Technique |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 25 |  | 23 |
Banks/financial Institutions | Fixed Maturities | Consensus Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 25 |  | 23 |
Banks/financial Institutions | Perpetual securities: |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 2,787 |  | 2,738 |
Banks/financial Institutions | Perpetual securities: | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 56 |  | 52 |
Banks/financial Institutions | Perpetual securities: | Consensus Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 52 |
Banks/financial Institutions | Perpetual securities: | Model Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Available-for-sale Securities | 56 |  |  |
Interest rate swaps |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives |  |  | 1 |
Interest rate swaps | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives |  |  | 1 |
Interest rate swaps | Discounted Cash Flow Valuation Technique | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives |  |  | 1 |
Interest rate swaps | Assets | Lower Limit | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation |  |  | 65.00% | [1]
Fair Value Inputs, Entity Credit Risk |  |  | 0.65% |
Interest rate swaps | Assets | Upper Limit | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation |  |  | 76.00% | [1]
Fair Value Inputs, Entity Credit Risk |  |  | 1.06% |
Interest rate swaps | Assets | Weighted Average | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation |  |  | 72.00% | [1]
Fair Value Inputs, Entity Credit Risk |  |  | 0.92% |
Fair Value Inputs, Recovery Rate |  |  | 37.00% |
Foreign currency swaps |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives | 426 |  | 445 |
Foreign currency swaps | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives | 106 |  | 104 |
Credit default swaps |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives | 1 |  | 1 |
Credit default swaps | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives | 1 |  | 1 |
Credit default swaps | Discounted Cash Flow Valuation Technique | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Asset derivatives | 1 |  | 1 |
Credit default swaps | Assets | Lower Limit | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation | 65.00% | [1] | 65.00% | [1]
Fair Value Inputs, Entity Credit Risk | 0.66% |  | 0.65% |
Credit default swaps | Assets | Upper Limit | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation | 75.00% | [1] | 76.00% | [1]
Fair Value Inputs, Entity Credit Risk | 1.01% |  | 1.06% |
Credit default swaps | Assets | Weighted Average | Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Base Correlation | 72.00% | [1] | 72.00% | [1]
Fair Value Inputs, Entity Credit Risk | 0.86% |  | 0.92% |
Fair Value Inputs, Recovery Rate | 37.00% |  | 37.00% |
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 | 30 |  | 30 |
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 | 20.45% | [2] | 21.16% | [2]
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% |  | 0.16% |
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 | 1.24% |  | 1.41% |
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 | 8 |  | 9 |
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 | 0.21% |  | 0.17% |
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 | 1.20% |  | 1.49% |
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 | $ 68 |  | $ 65 |
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 | 20.45% | [2] | 21.16% | [2]
Japan, Yen | 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 | 0.83% | [3] | 0.93% | [3]
Japan, Yen | 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 | 1.96% | [3] | 2.02% | [3]
Japan, Yen | 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 | 0.83% | [3] | 0.93% | [3]
Japan, Yen | 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 | 1.96% | [3] | 2.02% | [3]
Japan, Yen | 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 | 0.83% | [3] | 0.93% | [3]
Japan, Yen | 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 | 1.96% | [3] | 2.02% | [3]
United States of America, Dollars | 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 | 2.84% | [4] | 3.09% | [4]
United States of America, Dollars | 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 | 3.56% | [4] | 3.96% | [4]
United States of America, Dollars | 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 | 2.84% | [4] | 3.09% | [4]
United States of America, Dollars | 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 | 3.56% | [4] | 3.96% | [4]
United States of America, Dollars | 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 | 2.84% | [4] | 3.09% | [4]
United States of America, Dollars | 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 | 3.56% | [4] | 3.96% | [4]
[1] | Weighted-average range of base correlations for our bespoke tranches for attachment and detachment points corresponding to market indices
[2] | Based on 10 year volatility of JPY/USD exchange rate
[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

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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=25499696&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=28360136&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=27724398&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=6871852&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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: 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 3: 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=28364263&loc=d3e13495-108611 Reference 4: 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=20225523&loc=SL20225862-175312 Reference 5: 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 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=28370219&loc=SL20226008-175313 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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