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Investments in Securities Other-than-temporary Impairments 1 (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Gross unrealized losses on available-for-sale securities that had existed for a period of 12 consecutive months or longer $ 673
Fair value of securities with unrealized losses for 12 consecutive months or longer as percentage of amortized cost basis 87.00%