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SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Sales and redemptions $ 68us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments $ 41us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Other than temporary impairment losses realized (6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1] (3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1]
Total before tax 1,013us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,104us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) or benefit (350)us-gaap_IncomeTaxExpenseBenefit (372)us-gaap_IncomeTaxExpenseBenefit
Net of tax 663us-gaap_NetIncomeLoss 732us-gaap_NetIncomeLoss
The expected U.S. tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Reclassification Out Of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net of tax 32us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 24us-gaap_NetIncomeLoss
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Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on investment securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Sales and redemptions 56us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 5us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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Other than temporary impairment losses realized (6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Total before tax 50us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Income tax (expense) or benefit (18)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [2] (1)us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [2]
Net of tax 32us-gaap_NetIncomeLoss
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 1us-gaap_NetIncomeLoss
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Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Acquisition and operating expenses, actuarial gains (losses) (4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [3] (4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [3]
Acquisition and operating expenses, prior service (cost) credit 4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [3] 4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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Income tax (expense) or benefit 0us-gaap_IncomeTaxExpenseBenefit
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] 0us-gaap_IncomeTaxExpenseBenefit
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]
Net of tax 0us-gaap_NetIncomeLoss
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 0us-gaap_NetIncomeLoss
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Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized foreign currency translation gains (losses)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Sales and redemptions   36us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedTranslationAdjustmentMember
Income tax (expense) or benefit   (13)us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [2]
Net of tax   $ 23us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
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[1] Includes $6 and $3 for the three-month periods ended March 31, 2015 and 2014, respectively, from change in intent to sell securities
[2] Based on 35% tax rate
[3] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 10 for additional details).