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Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Locations
Dec. 31, 2012
Accounting Policies [Abstract]    
Locations 360  
Amortization period of credit card loans, months 12 months  
Fixed rate intervals, years or more 3 years  
Period past due loans are placed on non-accrual, days 90 days  
Consumer loans charged down to fair value, days delinquent 120 days  
Receivable past due, days 180 days  
Long-term agreements to resell $ 1,150,000,000 $ 1,200,000,000
Securities accepted as collateral 1,200,000,000  
Securities sold under agreements to repurchase 971,800,000  
Long-term structured repurchase agreements 350,000,000  
Available for sale securities as collateral for repurchase agreements $ 2,800,000,000  
Interest rate swaps designated as fair value hedges 2  
Common stock dividend rate percentage 5.00%