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 $)
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Credit Extension Commitments [Abstract]            
Legally Binding Unfunded Commitments Syndicated $ 22,100,000,000   $ 23,900,000,000      
Carrying Amount Credit Extension Commitments Syndicated 493,000,000   534,000,000      
Deferred revenue related to binding unfunded lending commitments 19,000,000   21,000,000      
Other Liabilities Reserve For Unfunded Lending Commitments 474,000,000 486,000,000 513,000,000 574,000,000 651,000,000 714,000,000
Notional Amount Of Credit Extension Commitments Under Fair Value Option 15,900,000,000   18,300,000,000      
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 504,128,000,000   530,383,000,000      
Expire After One Year Through Three Years 119,537,000,000   108,926,000,000      
Expire After Three Years Through Five Years 158,542,000,000   157,253,000,000      
Expire After Five Years 42,072,000,000   47,095,000,000      
Notional Amount Of Credit Extension Commitments 824,279,000,000   843,657,000,000      
External Credit Rating, Investment Grade [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Notional amount of Sblcs and financial guarantees 29,800,000,000   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 10,100,000,000   11,600,000,000      
Legally Binding Commitments [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 121,530,000,000   132,521,000,000      
Expire After One Year Through Three Years 119,537,000,000   108,926,000,000      
Expire After Three Years Through Five Years 158,542,000,000   157,253,000,000      
Expire After Five Years 42,072,000,000   47,095,000,000      
Notional Amount Of Credit Extension Commitments 441,681,000,000   445,795,000,000      
Loan Commitments [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 92,984,000,000   103,791,000,000      
Expire After One Year Through Three Years 93,336,000,000   83,885,000,000      
Expire After Three Years Through Five Years 132,788,000,000   130,805,000,000      
Expire After Five Years 21,120,000,000   19,942,000,000      
Notional Amount Of Credit Extension Commitments 340,228,000,000   338,423,000,000      
Home Equity [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 3,116,000,000   2,134,000,000      
Expire After One Year Through Three Years 15,907,000,000   13,584,000,000      
Expire After Three Years Through Five Years 23,295,000,000   23,344,000,000      
Expire After Five Years 16,112,000,000   21,856,000,000      
Notional Amount Of Credit Extension Commitments 58,430,000,000   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 23,126,000,000 [1]   24,593,000,000 [1]      
Expire After One Year Through Three Years 10,239,000,000 [1]   11,387,000,000 [1]      
Expire After Three Years Through Five Years 2,457,000,000 [1]   3,094,000,000 [1]      
Expire After Five Years 4,005,000,000 [1]   4,751,000,000 [1]      
Notional Amount Of Credit Extension Commitments 39,827,000,000 [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 10,000,000   669,000,000      
Letter of Credit [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 2,304,000,000   2,003,000,000      
Expire After One Year Through Three Years 55,000,000   70,000,000      
Expire After Three Years Through Five Years 2,000,000   10,000,000      
Expire After Five Years 835,000,000   546,000,000      
Notional Amount Of Credit Extension Commitments 3,196,000,000   2,629,000,000      
Credit Card Lines [Member]
           
Notional Amount of Credit Extension Commitments [Abstract]            
Expire in One Year or Less 382,598,000,000 [2]   397,862,000,000 [2]      
Notional Amount Of Credit Extension Commitments 382,598,000,000 [2]   397,862,000,000 [2]      
Unfunded loan commitments [Member]
           
Credit Extension Commitments [Abstract]            
Fair Value Carrying Amount Liabilities $ 486,000,000   $ 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 $29.8 billion and $10.1 billion at June 30, 2013, and $31.5 billion and $11.6 billion at December 31, 2012. Amounts include consumer SBLCs of $10 million and $669 million at June 30, 2013 and December 31, 2012.
[2] Includes business card unused lines of credit.