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SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Sales and redemptions                 $ 215us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments $ 262us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments $ 474us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Other-than-temporary impairment losses realized                 (31)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1] (199)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1] (977)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1]
Total before tax 1,075us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,074us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,238us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,104us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,028us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,069us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,358us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,361us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 4,491us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 4,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 4,302us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Tax (Expense) Benefit (372)us-gaap_IncomeTaxExpenseBenefit (368)us-gaap_IncomeTaxExpenseBenefit (428)us-gaap_IncomeTaxExpenseBenefit (372)us-gaap_IncomeTaxExpenseBenefit (353)us-gaap_IncomeTaxExpenseBenefit (367)us-gaap_IncomeTaxExpenseBenefit (469)us-gaap_IncomeTaxExpenseBenefit (469)us-gaap_IncomeTaxExpenseBenefit (1,540)us-gaap_IncomeTaxExpenseBenefit (1,658)us-gaap_IncomeTaxExpenseBenefit (1,436)us-gaap_IncomeTaxExpenseBenefit
Net of tax                 2,951us-gaap_NetIncomeLoss 3,158us-gaap_NetIncomeLoss 2,866us-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 on Derivatives [Line Items]                      
Net of tax                 36us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 31us-gaap_NetIncomeLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on investment securities                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Sales and redemptions                 57us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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Other-than-temporary impairment losses realized                 (3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
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Total before tax                 54us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 56us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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Income Tax (Expense) Benefit                 (19)us-gaap_IncomeTaxExpenseBenefit
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Net of tax                 35us-gaap_NetIncomeLoss
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Reclassification out of Accumulated Other Comprehensive Income | Pension liability adjustment                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Acquisition and operating expense, actuarial gains (losses)                 (15)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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Acquisition and operating expenses, prior service (cost) credit                 17us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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Income Tax (Expense) Benefit                 (1)us-gaap_IncomeTaxExpenseBenefit
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Net of tax                 1us-gaap_NetIncomeLoss
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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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 on Derivatives [Line Items]                      
Sales and redemptions                   7us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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Income Tax (Expense) Benefit                   (2)us-gaap_IncomeTaxExpenseBenefit
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Net of tax                   $ 5us-gaap_NetIncomeLoss
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[1] Includes $45 and $597 for the years ended December 31, 2013 and 2012, respectively, for credit-related impairments; $26 and $27 for the years ended December 31, 2013 and 2012, respectively, for impairments due to severity and duration of decline in fair value; and $31, $128 and $353 for the years ended December 31, 2014, 2013 and 2012, 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 14 for additional details).