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Loans - Consumer, Excluding Credit Card Loan Portfolio, PCI Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value $ 947,651 $ 924,838 $ 909,182
Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 375,958 372,553 $ 369,413
Consumer, excluding credit card | Total PCI      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 231,361 216,496  
Unpaid principal balance of impaired loans 6,439 7,741  
Consumer, excluding credit card | Total PCI | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 74,324 68,855  
Consumer, excluding credit card | Total PCI | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 10,624 9,598  
Consumer, excluding credit card | Total PCI | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 29,146 27,473  
Consumer, excluding credit card | Total PCI | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,057 6,962  
Consumer, excluding credit card | Total PCI | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 15,242 14,501  
Consumer, excluding credit card | Total PCI | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,448 7,142  
Consumer, excluding credit card | Total PCI | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,545 6,323  
Consumer, excluding credit card | Total PCI | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,519 4,109  
Consumer, excluding credit card | Total PCI | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 53,399 51,690  
Consumer, excluding credit card | Total PCI | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 888 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 28 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 30 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 20 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 60 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 3,606 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 314 483  
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 212,585 194,758  
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 6,734 6,952  
Consumer, excluding credit card | Total PCI | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 225,799 208,713  
Consumer, excluding credit card | Total PCI | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,825 4,234  
Consumer, excluding credit card | Total PCI | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,737 3,549  
Consumer, excluding credit card | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 29,318 33,450  
Unpaid principal balance of impaired loans 3,537 3,701  
Consumer, excluding credit card | Home equity | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,852 6,582  
Consumer, excluding credit card | Home equity | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,619 1,847  
Consumer, excluding credit card | Home equity | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,016 6,866  
Consumer, excluding credit card | Home equity | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 904 1,026  
Consumer, excluding credit card | Home equity | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,208 2,521  
Consumer, excluding credit card | Home equity | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,702 1,957  
Consumer, excluding credit card | Home equity | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 246 295  
Consumer, excluding credit card | Home equity | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,211 1,439  
Consumer, excluding credit card | Home equity | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,192 8,264  
Consumer, excluding credit card | Home equity | No FICO/LTV available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,357 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 6 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 1 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 138 296  
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 46 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 1,059 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 359 569  
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 22,851 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 3,501 3,850  
Consumer, excluding credit card | Home equity | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 28,554 32,391  
Consumer, excluding credit card | Home equity | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 470 671  
Consumer, excluding credit card | Home equity | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 294 388  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 25,209 30,576  
Unpaid principal balance of impaired loans $ 25,971 $ 31,617  
% of 30 days past due to total loans 9.39% 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 $ 13,977 $ 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 2,367 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 1,746 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 776 966  
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 748 883  
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 739 866  
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 515 633  
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 449 550  
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 423 520  
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 411 525  
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 3,820 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 1,259 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 21 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 45 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 192 353  
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 181 320  
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 1,145 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 938 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 14,406 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 7,784 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 23,532 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 1,250 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 1,189 1,584  
Consumer, excluding credit card | Residential real estate – PCI | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,393 10,799  
Unpaid principal balance of impaired loans $ 9,567 $ 11,020  
% of 30 days past due to total loans 5.44% 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 $ 5,678 $ 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 1,014 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 543 607  
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 442 532  
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 242 273  
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 217 242  
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 67 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 51 57  
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 56 66  
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 175 203  
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 1,082 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 502 577  
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 17 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 15 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 153 274  
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 73 132  
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 846 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 394 559  
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 5,627 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 1,940 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 9,047 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 257 356  
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 263 392  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Prime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,931 6,479  
Unpaid principal balance of impaired loans $ 4,955 $ 6,502  
% of 30 days past due to total loans 10.62% 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 $ 2,706 $ 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 351 428  
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 383 457  
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 103 135  
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 164 200  
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 145 178  
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 118 149  
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 104 129  
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 94 123  
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 70 106  
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 717 881  
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 249 319  
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 1 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 10 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 7 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 24 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 92 221  
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 132 230  
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 2,791 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 1,649 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 4,429 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 269 336  
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 257 327  
Consumer, excluding credit card | Residential real estate – PCI | Mortgage | Subprime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,072 2,609  
Unpaid principal balance of impaired loans $ 2,592 $ 3,197  
% of 30 days past due to total loans 16.98% 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 $ 627 $ 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 249 296  
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 282 330  
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 46 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 131 161  
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 94 110  
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 78 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 106 132  
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 39 51  
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 45 60  
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 895 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 124 149  
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 0 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 12 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 8 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 38 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 62 119  
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 192 309  
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 753 895  
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 1,403 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 2,152 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 297 381  
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 143 176  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,813 10,689  
Unpaid principal balance of impaired loans $ 8,857 $ 10,898  
% of 30 days past due to total loans 10.76% 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 $ 4,966 $ 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 753 878  
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 538 628  
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 185 238  
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 211 249  
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 283 336  
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 252 307  
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 188 232  
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 234 280  
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 121 156  
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 1,126 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 384 470  
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 3 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 24 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 46 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 145 316  
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 220 371  
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 5,235 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 2,792 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 7,904 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 427 547  
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 $ 526 $ 689