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USD ($) / shares
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12/31/2010
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12/31/2009
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12/31/2010
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12/31/2009
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The unrealized losses relate to ARS, which have been in an unrealized loss position longer than 12 months but have not been deemed other-than-temporarily impaired. 216Investment Securities (Available-for-Sale Investment Securities, Unrealized Gains and Losses) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
