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Loans - Consumer, Excluding Credit Card Loan Portfolio, PCI Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value $ 844,195 $ 832,792 $ 756,971
Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 43,932 45,559  
Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 353,871 344,355 $ 304,917
Consumer, excluding credit card | Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 220,038 211,798  
Consumer, excluding credit card | Residential real estate | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 59,971 56,208  
Consumer, excluding credit card | Residential real estate | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 31,245 30,609  
Consumer, excluding credit card | Residential real estate | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 15,473 14,944  
Consumer, excluding credit card | Residential real estate | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 12,148 11,660  
Consumer, excluding credit card | Residential real estate | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,950 9,586  
Consumer, excluding credit card | Residential real estate | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,386 8,157  
Consumer, excluding credit card | Residential real estate | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,881 5,627  
Consumer, excluding credit card | Residential real estate | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,391 5,298  
Consumer, excluding credit card | Residential real estate | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,312 3,295  
Consumer, excluding credit card | Residential real estate | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,889 2,899  
Consumer, excluding credit card | Residential real estate | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 65,392 63,515  
Consumer, excluding credit card | Residential real estate | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,759 4,714  
Consumer, excluding credit card | Residential real estate | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 184 223  
Consumer, excluding credit card | Residential real estate | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 93 109  
Consumer, excluding credit card | Residential real estate | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,266 1,618  
Consumer, excluding credit card | Residential real estate | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 600 725  
Consumer, excluding credit card | Residential real estate | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,969 7,696  
Consumer, excluding credit card | Residential real estate | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,155 2,405  
Consumer, excluding credit card | Residential real estate | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 181,680 171,889  
Consumer, excluding credit card | Residential real estate | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 11,778 11,731  
Consumer, excluding credit card | Residential real estate | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,222 4,750  
Consumer, excluding credit card | Residential real estate | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,007 6,286  
Consumer, excluding credit card | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 43,932 45,559  
Consumer, excluding credit card | Home equity | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,618 8,945  
Consumer, excluding credit card | Home equity | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,810 9,147  
Consumer, excluding credit card | Home equity | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,292 3,420  
Consumer, excluding credit card | Home equity | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,437 2,532  
Consumer, excluding credit card | Home equity | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,418 2,409  
Consumer, excluding credit card | Home equity | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,514 2,590  
Consumer, excluding credit card | Home equity | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,398 1,451  
Consumer, excluding credit card | Home equity | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,053 2,143  
Consumer, excluding credit card | Home equity | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,296 1,350  
Consumer, excluding credit card | Home equity | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,587 1,652  
Consumer, excluding credit card | Home equity | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,509 9,920  
Consumer, excluding credit card | Home equity | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,874 3,056  
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 129 165  
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 30 32  
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 1,051 1,344  
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 347 434  
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 4,096 4,537  
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 1,260 1,409  
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 29,228 29,648  
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 4,917 4,934  
Consumer, excluding credit card | Home equity | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 626 708  
Consumer, excluding credit card | Home equity | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 541 552  
Consumer, excluding credit card | Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 176,106 166,239  
Consumer, excluding credit card | Mortgages | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 51,353 47,263  
Consumer, excluding credit card | Mortgages | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 22,435 21,462  
Consumer, excluding credit card | Mortgages | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 12,181 11,524  
Consumer, excluding credit card | Mortgages | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 9,711 9,128  
Consumer, excluding credit card | Mortgages | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 7,532 7,177  
Consumer, excluding credit card | Mortgages | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,872 5,567  
Consumer, excluding credit card | Mortgages | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 4,483 4,176  
Consumer, excluding credit card | Mortgages | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,338 3,155  
Consumer, excluding credit card | Mortgages | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,016 1,945  
Consumer, excluding credit card | Mortgages | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,302 1,247  
Consumer, excluding credit card | Mortgages | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 55,883 53,595  
Consumer, excluding credit card | Mortgages | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 1,885 1,658  
Consumer, excluding credit card | Mortgages | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 55 58  
Consumer, excluding credit card | Mortgages | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 63 77  
Consumer, excluding credit card | Mortgages | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 215 274  
Consumer, excluding credit card | Mortgages | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 253 291  
Consumer, excluding credit card | Mortgages | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 2,873 3,159  
Consumer, excluding credit card | Mortgages | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 895 996  
Consumer, excluding credit card | Mortgages | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 152,452 142,241  
Consumer, excluding credit card | Mortgages | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 6,861 6,797  
Consumer, excluding credit card | Mortgages | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,596 4,042  
Consumer, excluding credit card | Mortgages | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 5,466 5,734  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 39,743 40,998  
Related allowance for loan losses 2,695 2,742  
Total loans $ 41,304 $ 42,665  
% of 30 days past due to total loans 10.47% 11.21%  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 22,774 $ 23,490  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,497 2,581  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,106 1,150  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 609 636  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 3,501 3,621  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,117 1,157  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,379 1,433  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 685 703  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 431 448  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 175 185  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7,030 7,261  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,210 2,325  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 148 192  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 157 199  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,048 1,305  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 863 1,055  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,190 4,833  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 3,036 3,443  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 19,143 18,903  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 10,509 10,410  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 36,981 37,883  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,712 1,896  
Consumer, excluding credit card | Residential real estate – PCI | Residential real estate | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,611 2,886  
Consumer, excluding credit card | Residential real estate – PCI | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 14,522 14,989  
Related allowance for loan losses 1,708 1,708  
Total loans $ 14,853 $ 15,342  
% of 30 days past due to total loans 5.76% 6.22%  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 8,917 $ 9,205  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 767 788  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 349 358  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 213 224  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,433 1,479  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 304 310  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 785 819  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 273 281  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 42 44  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 16 17  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,754 1,817  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 854 889  
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]      
Total loans 116 153  
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]      
Total loans 67 80  
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]      
Total loans 776 942  
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]      
Total loans 367 444  
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]      
Total loans 2,421 2,709  
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]      
Total loans 1,039 1,136  
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]      
Total loans 6,891 6,724  
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]      
Total loans 2,322 2,265  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 13,997 14,387  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 285 322  
Consumer, excluding credit card | Residential real estate – PCI | Home equity | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 571 633  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 8,594 8,893  
Related allowance for loan losses 938 985  
Total loans $ 8,621 $ 8,919  
% of 30 days past due to total loans 11.17% 11.49%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 5,008 $ 5,172  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 559 580  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 250 263  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 89 94  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 562 586  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 231 238  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 188 194  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 139 143  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 135 141  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 43 45  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,417 1,463  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 474 498  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 9 10  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 21 28  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 89 120  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 121 152  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 667 816  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 523 614  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,264 4,243  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,453 2,438  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7,658 7,894  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 407 424  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Prime mortgage | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 556 601  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 3,174 3,263  
Related allowance for loan losses 0 0  
Total loans $ 3,927 $ 4,051  
% of 30 days past due to total loans 18.31% 20.22%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 979 $ 1,005  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 386 400  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 190 196  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 235 243  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 362 373  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 133 139  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 77 81  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 74 76  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 109 113  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 61 62  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,321 1,363  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 198 210  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7 10  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 41 55  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 58 77  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 183 220  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 285 331  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 572 643  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 907 863  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,676 1,642  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 3,208 3,232  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 385 439  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Subprime mortgage | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 334 380  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value 13,453 13,853  
Related allowance for loan losses 49 49  
Total loans $ 13,903 $ 14,353  
% of 30 days past due to total loans 12.84% 13.82%  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 7,870 $ 8,108  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 785 813  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 317 333  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 72 75  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,144 1,183  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 449 470  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 329 339  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 199 203  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 145 150  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 55 61  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 2,538 2,618  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | No FICO or LTV Score Available      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 684 728  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Greater than 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 16 19  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Greater than 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 28 36  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 101% to 125% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 125 166  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 101% to 125% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 192 239  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 80% to 100% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 817 977  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 80% to 100% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 902 1,050  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Less than 80% and refreshed FICO scores | Equal to or greater than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7,081 7,073  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Less than 80% and refreshed FICO scores | Less than 660      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,058 4,065  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | Current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 12,118 12,370  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 30–149 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 635 711  
Consumer, excluding credit card | Residential real estate – PCI | Mortgages | Option ARMs | 150 or more days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 1,150 $ 1,272