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Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net tax effect on income (loss) from discontinued operations $ 3,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 2,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Impairment losses related to securities   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Maximum [Member]    
Net securities gains (losses) 1,000,000us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1,000,000us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Impairment losses related to securities $ 1,000,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember