Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Details)

v2.4.0.6
Summary of Significant Accounting Principles (Details) (USD $)
In Billions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounting Policy Dates [Abstract]    
Terminated Cash Flow Hedges, Maximum Length of Time Over Which Forecasted Transactions Are Hedged 25 years  
Terminated Cash Flow Hedges, Maximum Length of Time Over Which Forecasted Transactions Are Hedged For Substantial Number 10 years  
For Open or Future Cash Flow Hedges, Maximum Length of Time over Which Forecasted Transactions Hedged 7 years  
Non-bankrupt Credit Card Loans and Unsecured Consumer Loans Charge Off Period 180 days  
Outstanding Balance of Real Estate Secured Loans Charge Off Period 180 days  
Personal Property Secured Loans Charge off Period 120 days  
Unsecured Accounts in Bankruptcy Including Credit Cards, Charge off Period 60 days  
Period Secured Products Are Written Down to the Collateral Value 60 days  
Period Real Estate Secured Loans Placed on Nonaccrual Status and Classified as Nonperforming 90 days  
Period for Sustained Repayment Performance 6 months  
Period Commercial Loans and Leases Placed on Nonaccrual Status and Classified as Nonperforming 90 days  
Commercial Loans and Leases Modified in a Troubled Debt Restructuring Placed on Nonaccrual Status and reported as nonperforming 6 months  
Period Business card loans are charged off 180 days  
Period for receipt of notification of bankruptcy filing 60 days  
Period Uncollected fees are Written off for Card Receivables 180 days  
Period Uncollected Fees are Written off 60 days  
In Text Details [Abstract]    
Securities Held as Collateral, at Fair Value $ 513.2 $ 393.9
Securities Received as Collateral, Amount Repledged and Sold $ 362.0 $ 287.7
Building [Member]
    
Accounting Policy Dates [Abstract]    
Property, Plant and Equipment, Estimated Useful Lives 40 years  
Furniture and Equipment [Member]
    
Accounting Policy Dates [Abstract]    
Property, Plant and Equipment, Estimated Useful Lives 12 years  
Home Equity [Member]
    
In Text Details [Abstract]    
Loss Severity on Loans in Second Lien Position 10000.00%