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Loans - Consumer, Excluding Credit Card Loans, PCI Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value $ 969,415 $ 924,838 $ 889,907
Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 373,637 372,553 $ 364,406
Consumer, excluding credit card | Total PCI      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 231,078 216,496  
Total unpaid principal balance 6,207 7,741  
Consumer, excluding credit card | Total PCI | California      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 74,759 68,855  
Consumer, excluding credit card | Total PCI | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 10,704 9,598  
Consumer, excluding credit card | Total PCI | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 28,847 27,473  
Consumer, excluding credit card | Total PCI | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 8,304 6,962  
Consumer, excluding credit card | Total PCI | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 15,249 14,501  
Consumer, excluding credit card | Total PCI | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 7,302 7,142  
Consumer, excluding credit card | Total PCI | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 6,574 6,323  
Consumer, excluding credit card | Total PCI | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 4,434 4,109  
Consumer, excluding credit card | Total PCI | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 52,996 51,690  
Consumer, excluding credit card | Total PCI | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 813 1,259  
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 25 37  
Consumer, excluding credit card | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 13 19  
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 37 36  
Consumer, excluding credit card | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 53 88  
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 3,977 4,369  
Consumer, excluding credit card | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 281 483  
Consumer, excluding credit card | Total PCI | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 212,505 194,758  
Consumer, excluding credit card | Total PCI | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 6,457 6,952  
Consumer, excluding credit card | Total PCI | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 225,899 208,713  
Consumer, excluding credit card | Total PCI | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 2,763 4,234  
Consumer, excluding credit card | Total PCI | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 2,416 3,549  
Consumer, excluding credit card | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 28,340 33,450  
Total unpaid principal balance 3,466 3,701  
Consumer, excluding credit card | Home equity | California      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 5,695 6,582  
Consumer, excluding credit card | Home equity | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 1,575 1,847  
Consumer, excluding credit card | Home equity | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 5,769 6,866  
Consumer, excluding credit card | Home equity | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 869 1,026  
Consumer, excluding credit card | Home equity | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 2,131 2,521  
Consumer, excluding credit card | Home equity | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 1,642 1,957  
Consumer, excluding credit card | Home equity | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 236 295  
Consumer, excluding credit card | Home equity | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 1,158 1,439  
Consumer, excluding credit card | Home equity | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 6,925 8,264  
Consumer, excluding credit card | Home equity | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 885 1,689  
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 6 10  
Consumer, excluding credit card | Home equity | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [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      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 111 296  
Consumer, excluding credit card | Home equity | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 38 95  
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 986 1,676  
Consumer, excluding credit card | Home equity | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 326 569  
Consumer, excluding credit card | Home equity | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 22,632 25,262  
Consumer, excluding credit card | Home equity | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 3,355 3,850  
Consumer, excluding credit card | Home equity | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 27,611 32,391  
Consumer, excluding credit card | Home equity | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 453 671  
Consumer, excluding credit card | Home equity | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 276 388  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 24,034 30,576  
Total unpaid principal balance $ 24,741 $ 31,617  
% of 30 plus days past due to total loans 9.16% 10.13%  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 13,389 $ 17,293  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 2,255 2,739  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,660 2,022  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 738 966  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 709 883  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 690 866  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 491 633  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 417 550  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 393 520  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 389 525  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 3,610 4,620  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 951 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      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 21 45  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 36 66  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 162 353  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 155 320  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,053 1,851  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 851 1,469  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 14,087 16,693  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 7,425 9,305  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 22,475 28,413  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,221 1,620  
Consumer, excluding credit card | Residential real estate – PCI | Total PCI | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,045 1,584  
Consumer, excluding credit card | Residential real estate – PCI | Home equity      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 8,963 10,799  
Total unpaid principal balance $ 9,144 $ 11,020  
% of 30 plus days past due to total loans 5.69% 6.79%  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 5,420 $ 6,555  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 976 1,137  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 525 607  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 419 532  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 233 273  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 210 242  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 65 79  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 48 57  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 54 66  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 165 203  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,029 1,269  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 265 577  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 17 33  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 13 21  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 135 274  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 65 132  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 805 1,195  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 388 559  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 5,548 6,134  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,908 2,095  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 8,624 10,272  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 278 356  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 242 392  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 4,690 6,479  
Total unpaid principal balance $ 4,708 $ 6,502  
% of 30 plus days past due to total loans 10.24% 10.20%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 2,578 $ 3,716  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 332 428  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 365 457  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 98 135  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 154 200  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 134 178  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 113 149  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 95 129  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 91 123  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 69 106  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 679 881  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 228 319  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1 4  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 7 16  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 6 16  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 22 42  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 75 221  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 112 230  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 2,689 3,551  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,568 2,103  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 4,226 5,839  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 259 336  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 223 327  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 1,945 2,609  
Total unpaid principal balance $ 2,442 $ 3,197  
% of 30 plus days past due to total loans 16.75% 17.42%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 593 $ 797  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 234 296  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 268 330  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 44 61  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 123 161  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 88 110  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 73 98  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 96 132  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 37 51  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 43 60  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 843 1,101  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 113 149  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 0 2  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 9 20  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 4 20  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 35 75  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 54 119  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 161 309  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 739 895  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,327 1,608  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 2,033 2,640  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 286 381  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 123 176  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs      
Loans and Leases Receivable Disclosure [Line Items]      
Carrying value 8,436 10,689  
Total unpaid principal balance $ 8,447 $ 10,898  
% of 30 plus days past due to total loans 10.12% 11.34%  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 4,798 $ 6,225  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 713 878  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 502 628  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 177 238  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 199 249  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 258 336  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Massachusetts      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 240 307  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 178 232  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 211 280  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 112 156  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 1,059 1,369  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | No FICO/LTV available      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 345 470  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 3 6  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Greater than 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 7 9  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 17 43  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 101% to 125% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 33 71  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 119 316  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 80% to 100% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 190 371  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Lower than 80% and refreshed FICO scores | Equal to or greater than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 5,111 6,113  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Lower than 80% and refreshed FICO scores | Less than 660      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 2,622 3,499  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | Current      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 7,592 9,662  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 30–149 days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance 398 547  
Consumer, excluding credit card | Residential real estate – PCI | Option ARMs | 150 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Total unpaid principal balance $ 457 $ 689