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Loans - Consumer, Excluding Credit Card Loan Portfolio, Other Consumer Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 844,195 $ 832,792 $ 756,971
Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 353,871 344,355 $ 304,917
Auto | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 62,937 $ 60,255  
% of 30 days past due to total retained loans 0.94% 1.35%  
Auto | Consumer, excluding credit card | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 11,906 $ 11,277  
Auto | Consumer, excluding credit card | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 218 76  
Auto | Consumer, excluding credit card | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 0 0  
Auto | Consumer, excluding credit card | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 7,578 7,186  
Auto | Consumer, excluding credit card | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,949 3,874  
Auto | Consumer, excluding credit card | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,914 3,678  
Auto | Consumer, excluding credit card | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 6,768 6,457  
Auto | Consumer, excluding credit card | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,066 2,843  
Auto | Consumer, excluding credit card | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 2,032 1,998  
Auto | Consumer, excluding credit card | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,162 1,135  
Auto | Consumer, excluding credit card | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 2,100 2,033  
Auto | Consumer, excluding credit card | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,528 1,550  
Auto | Consumer, excluding credit card | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 2,316 2,340  
Auto | Consumer, excluding credit card | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 28,524 27,161  
Auto | Current | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 62,343 59,442  
Auto | 30–119 days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 585 804  
Auto | 120 or more days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 9 9  
Auto | 90 or more days past due and still accruing | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 0 0  
Auto | Nonaccrual loans | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 102 116  
Business banking | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 21,370 $ 21,208  
% of 30 days past due to total retained loans 1.51% 1.51%  
Business banking | Consumer, excluding credit card | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 15,637 $ 15,505  
Business banking | Consumer, excluding credit card | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 799 815  
Business banking | Consumer, excluding credit card | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 238 210  
Business banking | Consumer, excluding credit card | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,644 3,530  
Business banking | Consumer, excluding credit card | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,357 3,359  
Business banking | Consumer, excluding credit card | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,511 1,459  
Business banking | Consumer, excluding credit card | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 2,569 2,622  
Business banking | Consumer, excluding credit card | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 951 941  
Business banking | Consumer, excluding credit card | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 492 500  
Business banking | Consumer, excluding credit card | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 269 264  
Business banking | Consumer, excluding credit card | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,217 1,205  
Business banking | Consumer, excluding credit card | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,359 1,361  
Business banking | Consumer, excluding credit card | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,357 1,363  
Business banking | Consumer, excluding credit card | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 4,644 4,604  
Business banking | Current | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 21,047 20,887  
Business banking | 30–119 days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 202 215  
Business banking | 120 or more days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 121 106  
Business banking | 90 or more days past due and still accruing | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 0 0  
Business banking | Nonaccrual loans | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 290 263  
Student and other | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 9,783 $ 10,096  
% of 30 days past due to total retained loans 1.29% 1.63%  
Student and other | Consumer, excluding credit card | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 1,023 $ 1,051  
Student and other | Consumer, excluding credit card | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,205 1,224  
Student and other | Consumer, excluding credit card | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 651 679  
Student and other | Consumer, excluding credit card | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 814 839  
Student and other | Consumer, excluding credit card | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 501 516  
Student and other | Consumer, excluding credit card | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 347 366  
Student and other | Consumer, excluding credit card | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 206 212  
Student and other | Consumer, excluding credit card | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 232 236  
Student and other | Consumer, excluding credit card | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 396 415  
Student and other | Consumer, excluding credit card | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 541 559  
Student and other | Consumer, excluding credit card | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,867 3,999  
Student and other | Current | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 9,186 9,405  
Student and other | 30–119 days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 366 445  
Student and other | 120 or more days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 231 246  
Student and other | 90 or more days past due and still accruing | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 269 290  
Student and other | Nonaccrual loans | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 196 242  
Student and other | Days Past Due, 30 or More, and Still Accruing | Consumer, excluding credit card | Student and Other Loans Insured or Guaranteed by U.S. Government Agencies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 471 526  
Total other consumer | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 94,090 $ 91,559  
% of 30 days past due to total retained loans 1.11% 1.42%  
Total other consumer | Consumer, excluding credit card | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 27,543 $ 26,782  
Total other consumer | Consumer, excluding credit card | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,017 891  
Total other consumer | Consumer, excluding credit card | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 238 210  
Total other consumer | Consumer, excluding credit card | California      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 12,245 11,767  
Total other consumer | Consumer, excluding credit card | New York      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 8,511 8,457  
Total other consumer | Consumer, excluding credit card | Illinois      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 6,076 5,816  
Total other consumer | Consumer, excluding credit card | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 10,151 9,918  
Total other consumer | Consumer, excluding credit card | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 4,518 4,300  
Total other consumer | Consumer, excluding credit card | New Jersey      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 2,871 2,864  
Total other consumer | Consumer, excluding credit card | Washington      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,637 1,611  
Total other consumer | Consumer, excluding credit card | Arizona      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,549 3,474  
Total other consumer | Consumer, excluding credit card | Michigan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 3,283 3,326  
Total other consumer | Consumer, excluding credit card | Ohio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 4,214 4,262  
Total other consumer | Consumer, excluding credit card | All other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 37,035 35,764  
Total other consumer | Current | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 92,576 89,734  
Total other consumer | 30–119 days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 1,153 1,464  
Total other consumer | 120 or more days past due | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 361 361  
Total other consumer | 90 or more days past due and still accruing | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans 269 290  
Total other consumer | Nonaccrual loans | Consumer, excluding credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 588 621  
Total other consumer | Days Past Due, 30 or More, and Still Accruing | Consumer, excluding credit card | Student and Other Loans Insured or Guaranteed by U.S. Government Agencies | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, charge-off criteria, period past due 30 days    
Student loan | Current | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 3,800 3,800  
Student loan | 30–119 days past due | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 256 299  
Student loan | 30–119 days past due | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member] | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, charge-off criteria, period past due 30 days    
Student loan | 30–119 days past due | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member] | Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, charge-off criteria, period past due 119 days    
Student loan | 120 or more days past due | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 215 $ 227  
Student loan | 120 or more days past due | Consumer, excluding credit card | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member] | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, charge-off criteria, period past due 120 days