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Financial Instruments (Securities Repurchase and Reverse Repurchase Arrangements) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Financial Instruments [Line Items]  
Securities Sold under Agreements to Repurchase $ 0
Securities For Repurchase Agreements 126,000,000
Reverse Repurchase Agreements Maturities 90
Securities for Reverse Repurchase Agreements 20,800,000,000
Off Book Financing [Member]
 
Financial Instruments [Line Items]  
Securities Sold under Agreements to Repurchase $ 0