Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Details)

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Summary of Significant Accounting Principles (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Building [Member]
Dec. 31, 2011
Furniture and Equipment [Member]
Dec. 31, 2011
Commercial Portfolio Segment [Member]
Accounting Standards Update 2011-02 [Member]
Sep. 30, 2011
Commercial Portfolio Segment [Member]
Accounting Standards Update 2011-02 [Member]
Dec. 31, 2011
Consumer Portfolio Segment [Member]
Accounting Standards Update 2011-02 [Member]
Dec. 31, 2011
Home Loans [Member]
Accounting Standards Update 2011-02 [Member]
Dec. 31, 2011
Home Equity [Member]
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                
Property, Plant and Equipment, Estimated Useful Lives     40 years 12 years          
Period Uncollected fees are Written off for Card Receivables 180 days                
Period Uncollected Fees are Written off 60 days                
In Text Details [Abstract]                  
Financing Receivable, Modifications, Recorded Investment         $ 1,100,000,000 $ 1,100,000,000   $ 2,600,000,000  
Securities Held as Collateral, at Fair Value 393,900,000,000 401,700,000,000              
Securities Received as Collateral, Amount Repledged and Sold 287,700,000,000 257,600,000,000              
New Accounting Pronouncement or Change in Accounting Principle, Loans and Leases Receivable Effected         402,000,000        
New Accounting Pronouncement or Change in Accounting Principle, Loans and Leases Receivable Allowance Effected             $ 27,000,000 $ 154,000,000  
Loss Severity on Loans in Second Lien Position                 10000.00%