Annual report pursuant to Section 13 and 15(d)

Securities - Asset Impairment Losses Recongized in Earnings (Details)

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Securities - Asset Impairment Losses Recongized in Earnings (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) $ (30)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities $ (21)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities $ (57)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Unrealized OTTI losses recognized in OCI 14us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities 1us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities 4us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Net impairment losses recognized in earnings $ (16)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities $ (20)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities $ (53)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities