Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies Commitments and Contingencies - Credit Extension Commitments (Details)

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Commitments and Contingencies Commitments and Contingencies - Credit Extension Commitments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Other Commitments [Line Items]    
Expire in One Year or Less $ 481,939 $ 471,320
Expire After One Year Through Three Years 145,294 126,525
Expire After Three Years Through Five Years 160,083 163,616
Expire After Five Years 48,431 36,254
Total 835,747 797,715
Loan Commitments    
Other Commitments [Line Items]    
Expire in One Year or Less 78,452 79,897
Expire After One Year Through Three Years 115,856 97,583
Expire After Three Years Through Five Years 149,567 146,743
Expire After Five Years 28,860 18,942
Total 372,735 343,165
Home equity    
Other Commitments [Line Items]    
Expire in One Year or Less 6,949 6,292
Expire After One Year Through Three Years 19,388 19,679
Expire After Three Years Through Five Years 6,331 12,319
Expire After Five Years 18,417 15,417
Total 51,085 53,707
Standby letters of credit and financial guarantees    
Other Commitments [Line Items]    
Expire in One Year or Less 19,026 19,259
Expire After One Year Through Three Years 9,887 9,106
Expire After Three Years Through Five Years 4,144 4,519
Expire After Five Years 1,063 1,807
Total 34,120 34,691
Standby letters of credit and financial guarantees | Investment grade    
Other Commitments [Line Items]    
Total 25,900 26,100
Standby letters of credit and financial guarantees | Non-investment grade    
Other Commitments [Line Items]    
Total 8,100 8,200
Letters of credit    
Other Commitments [Line Items]    
Expire in One Year or Less 1,871 1,883
Expire After One Year Through Three Years 163 157
Expire After Three Years Through Five Years 41 35
Expire After Five Years 91 88
Total 2,166 2,163
Legally binding commitments    
Other Commitments [Line Items]    
Expire in One Year or Less 106,298 107,331
Expire After One Year Through Three Years 145,294 126,525
Expire After Three Years Through Five Years 160,083 163,616
Expire After Five Years 48,431 36,254
Total 460,106 433,726
Credit card lines    
Other Commitments [Line Items]    
Expire in One Year or Less 375,641 363,989
Expire After One Year Through Three Years 0 0
Expire After Three Years Through Five Years 0 0
Expire After Five Years 0 0
Total 375,641 363,989
Consumer Portfolio Segment | Standby letters of credit and financial guarantees    
Other Commitments [Line Items]    
Total $ 143 $ 396