Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Credit Extension Commitments (Details)

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Commitments and Contingencies - Credit Extension Commitments (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Loss Contingencies [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent 49.00%      
Merchant escrow deposits held as collateral $ 226,000,000   $ 202,000,000  
Merchant Services Transactions Processed And Settled By Sponsored Entitites 148,300,000,000 133,200,000,000    
Credit Extension Commitments [Abstract]        
Legally Binding Unfunded Commitments Syndicated 23,100,000,000   23,900,000,000  
Carrying Amount Credit Extension Commitments Syndicated 507,000,000   534,000,000  
Deferred revenue related to binding unfunded lending commitments 21,000,000   21,000,000  
Other Liabilities Reserve For Unfunded Lending Commitments 486,000,000 651,000,000 513,000,000 714,000,000
Notional Amount Of Credit Extension Commitments Under Fair Value Option 15,700,000,000   18,300,000,000  
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 525,388,000,000   546,565,000,000  
Expire After One Year Through Three Years 109,768,000,000   108,926,000,000  
Expire After Three Years Through Five Years 156,973,000,000   157,253,000,000  
Expire After Five Years 44,130,000,000   47,095,000,000  
Notional Amount Of Credit Extension Commitments 836,259,000,000   859,839,000,000  
External Credit Rating, Investment Grade [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Notional amount of Sblcs and financial guarantees 30,200,000,000   31,500,000,000  
External Credit Rating, Non Investment Grade [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Notional amount of Sblcs and financial guarantees 11,200,000,000   11,600,000,000  
Legally Binding Commitments [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 121,701,000,000   132,521,000,000  
Expire After One Year Through Three Years 109,768,000,000   108,926,000,000  
Expire After Three Years Through Five Years 156,973,000,000   157,253,000,000  
Expire After Five Years 44,130,000,000   47,095,000,000  
Notional Amount Of Credit Extension Commitments 432,572,000,000   445,795,000,000  
Loan Commitments [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 93,870,000,000   103,791,000,000  
Expire After One Year Through Three Years 83,884,000,000   83,885,000,000  
Expire After Three Years Through Five Years 129,988,000,000   130,805,000,000  
Expire After Five Years 20,187,000,000   19,942,000,000  
Notional Amount Of Credit Extension Commitments 327,929,000,000   338,423,000,000  
Home Equity [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 2,164,000,000   2,134,000,000  
Expire After One Year Through Three Years 14,949,000,000   13,584,000,000  
Expire After Three Years Through Five Years 23,904,000,000   23,344,000,000  
Expire After Five Years 18,978,000,000   21,856,000,000  
Notional Amount Of Credit Extension Commitments 59,995,000,000   60,918,000,000  
Financial Standby Letter Of Credit And Financial Guarantee [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 23,756,000,000   24,593,000,000  
Expire After One Year Through Three Years 10,857,000,000   11,387,000,000  
Expire After Three Years Through Five Years 3,079,000,000   3,094,000,000  
Expire After Five Years 4,248,000,000   4,751,000,000  
Notional Amount Of Credit Extension Commitments 41,940,000,000 [1]   43,825,000,000 [1]  
Financial Standby Letter Of Credit And Financial Guarantee [Member] | Consumer Letter of Credit [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Notional Amount Of Credit Extension Commitments 562,000,000   669,000,000  
Letter of Credit [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 1,911,000,000   2,003,000,000  
Expire After One Year Through Three Years 78,000,000   70,000,000  
Expire After Three Years Through Five Years 2,000,000   10,000,000  
Expire After Five Years 717,000,000   546,000,000  
Notional Amount Of Credit Extension Commitments 2,708,000,000   2,629,000,000  
Credit Card Lines [Member]
        
Notional Amount of Credit Extension Commitments [Abstract]        
Expire in One Year or Less 403,687,000,000   414,044,000,000  
Notional Amount Of Credit Extension Commitments 403,687,000,000 [2]   414,044,000,000 [2]  
Unfunded loan commitments [Member]
        
Credit Extension Commitments [Abstract]        
Fair Value Carrying Amount Liabilities $ 468,000,000   $ 528,000,000  
[1] The notional amounts of SBLCs and financial guarantees classified as investment grade and non-investment grade based on the credit quality of the underlying reference name within the instrument were $30.2 billion and $11.2 billion at March 31, 2013, and $31.5 billion and $11.6 billion at December 31, 2012. Amounts include consumer SBLCs of $562 million and $669 million at March 31, 2013 and December 31, 2012.
[2] Includes business card unused lines of credit.