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Consolidated Statements of Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net tax effect on income (loss) from discontinued operations $ (23)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 26us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 14us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Net securities gains (losses)   1us-gaap_GainLossOnSaleOfSecuritiesNet  
Impairment losses related to securities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Maximum [Member]      
Net securities gains (losses) $ 1us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember