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Loans - Consumer, Excluding Credit Card Loan Portfolio, PCI Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value $ 940,440 $ 924,838 $ 899,576
Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 374,587 372,553 $ 365,115
Consumer, excluding credit card | Total PCI      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 225,864 216,496  
Unpaid principal balance of impaired loans 6,870 7,741  
Consumer, excluding credit card | Total PCI | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 72,207 68,855  
Consumer, excluding credit card | Total PCI | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 10,196 9,598  
Consumer, excluding credit card | Total PCI | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 28,523 27,473  
Consumer, excluding credit card | Total PCI | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,635 6,962  
Consumer, excluding credit card | Total PCI | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 14,977 14,501  
Consumer, excluding credit card | Total PCI | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,305 7,142  
Consumer, excluding credit card | Total PCI | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,360 6,323  
Consumer, excluding credit card | Total PCI | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,397 4,109  
Consumer, excluding credit card | Total PCI | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 53,000 51,690  
Consumer, excluding credit card | Total PCI | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,255 1,259  
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 26 37  
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 16 19  
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 24 36  
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 61 88  
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,323 4,369  
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 316 483  
Consumer, excluding credit card | Total PCI | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 206,159 194,758  
Consumer, excluding credit card | Total PCI | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,605 6,952  
Consumer, excluding credit card | Total PCI | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 219,735 208,713  
Consumer, excluding credit card | Total PCI | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,948 4,234  
Consumer, excluding credit card | Total PCI | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,181 3,549  
Consumer, excluding credit card | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 30,460 33,450  
Unpaid principal balance of impaired loans 3,604 3,701  
Consumer, excluding credit card | Home equity | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,028 6,582  
Consumer, excluding credit card | Home equity | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,669 1,847  
Consumer, excluding credit card | Home equity | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,257 6,866  
Consumer, excluding credit card | Home equity | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 938 1,026  
Consumer, excluding credit card | Home equity | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,290 2,521  
Consumer, excluding credit card | Home equity | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,768 1,957  
Consumer, excluding credit card | Home equity | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 263 295  
Consumer, excluding credit card | Home equity | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,273 1,439  
Consumer, excluding credit card | Home equity | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,527 8,264  
Consumer, excluding credit card | Home equity | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,452 1,689  
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7 10  
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2 3  
Consumer, excluding credit card | Home equity | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 165 296  
Consumer, excluding credit card | Home equity | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 51 95  
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,180 1,676  
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 392 569  
Consumer, excluding credit card | Home equity | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 23,607 25,262  
Consumer, excluding credit card | Home equity | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,604 3,850  
Consumer, excluding credit card | Home equity | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 29,664 32,391  
Consumer, excluding credit card | Home equity | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 457 671  
Consumer, excluding credit card | Home equity | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 339 388  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 26,977 30,576  
Unpaid principal balance of impaired loans $ 27,807 $ 31,617  
% of 30 days past due to total loans 9.40% 10.13%  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 15,096 $ 17,293  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 2,485 2,739  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,812 2,022  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 835 966  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 791 883  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 772 866  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 566 633  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Maryland      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 474 550  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 460 525  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Virginia      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 447 520  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 4,069 4,620  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,361 1,515  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 29 45  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 47 66  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 225 353  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 209 320  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,295 1,851  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,027 1,469  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 15,303 16,693  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 8,311 9,305  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 25,193 28,413  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,260 1,620  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,354 1,584  
Consumer, excluding credit card | Residential real estate – PCI | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,849 10,799  
Unpaid principal balance of impaired loans $ 10,023 $ 11,020  
% of 30 days past due to total loans 5.57% 6.79%  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 5,954 $ 6,555  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,053 1,137  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 563 607  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 471 532  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 252 273  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 225 242  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 71 79  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Maryland      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 53 57  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 184 203  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Virginia      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 59 66  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,138 1,269  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 523 577  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 22 33  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 14 21  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 176 274  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 86 132  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 928 1,195  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 419 559  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 5,844 6,134  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 2,011 2,095  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 9,465 10,272  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 248 356  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 310 392  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,437 6,479  
Unpaid principal balance of impaired loans $ 5,460 $ 6,502  
% of 30 days past due to total loans 10.38% 10.20%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 3,048 $ 3,716  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 374 428  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 396 457  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 112 135  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 176 200  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 157 178  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 133 149  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Maryland      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 109 129  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 87 106  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Virginia      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 100 123  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 768 881  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 288 319  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 2 4  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 12 16  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 10 16  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 26 42  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 119 221  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 154 230  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 3,022 3,551  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,827 2,103  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 4,893 5,839  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 271 336  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 296 327  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,249 2,609  
Unpaid principal balance of impaired loans $ 2,784 $ 3,197  
% of 30 days past due to total loans 16.45% 17.42%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 679 $ 797  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 264 296  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 292 330  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 51 61  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 142 161  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 97 110  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 84 98  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Maryland      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 113 132  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 52 60  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Virginia      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 43 51  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 967 1,101  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 134 149  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1 2  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 13 20  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 10 20  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 42 75  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 80 119  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 213 309  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 824 895  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,467 1,608  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 2,326 2,640  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 295 381  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 163 176  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,442 10,689  
Unpaid principal balance of impaired loans $ 9,540 $ 10,898  
% of 30 days past due to total loans 10.81% 11.34%  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 5,415 $ 6,225  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 794 878  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 561 628  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 201 238  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 221 249  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 293 336  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 278 307  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Maryland      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 199 232  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 137 156  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Virginia      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 245 280  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 1,196 1,369  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 416 470  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 4 6  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 8 9  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 29 43  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 55 71  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 168 316  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 241 371  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 5,613 6,113  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 3,006 3,499  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 8,509 9,662  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans 446 547  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of impaired loans $ 585 $ 689