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Loans - Consumer, Excluding Credit Card Loans, Other Consumer Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 832,792 $ 747,508 $ 724,177
Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 344,355 294,979 $ 288,449
Consumer, excluding credit card | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 60,255 $ 54,536  
Total 30 day delinquency rate 1.35% 1.23%  
Consumer, excluding credit card | Auto | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 11,277 $ 9,822  
Consumer, excluding credit card | Auto | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 76 35  
Consumer, excluding credit card | Auto | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 0 0  
Consumer, excluding credit card | Auto | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 7,186 6,294  
Consumer, excluding credit card | Auto | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,874 3,662  
Consumer, excluding credit card | Auto | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,678 3,175  
Consumer, excluding credit card | Auto | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 6,457 5,608  
Consumer, excluding credit card | Auto | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 2,843 2,301  
Consumer, excluding credit card | Auto | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,998 1,945  
Consumer, excluding credit card | Auto | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,135 1,019  
Consumer, excluding credit card | Auto | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 2,033 2,003  
Consumer, excluding credit card | Auto | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,550 1,633  
Consumer, excluding credit card | Auto | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 2,340 2,157  
Consumer, excluding credit card | Auto | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 27,161 24,739  
Consumer, excluding credit card | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 21,208 $ 20,058  
Total 30 day delinquency rate 1.51% 1.73%  
Consumer, excluding credit card | Business banking | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 15,505 $ 14,619  
Consumer, excluding credit card | Business banking | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 815 708  
Consumer, excluding credit card | Business banking | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 210 213  
Consumer, excluding credit card | Business banking | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,530 3,008  
Consumer, excluding credit card | Business banking | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,359 3,187  
Consumer, excluding credit card | Business banking | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,459 1,373  
Consumer, excluding credit card | Business banking | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 2,622 2,626  
Consumer, excluding credit card | Business banking | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 941 827  
Consumer, excluding credit card | Business banking | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 500 451  
Consumer, excluding credit card | Business banking | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 264 258  
Consumer, excluding credit card | Business banking | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,205 1,083  
Consumer, excluding credit card | Business banking | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,361 1,375  
Consumer, excluding credit card | Business banking | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,363 1,354  
Consumer, excluding credit card | Business banking | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 4,604 4,516  
Consumer, excluding credit card | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 10,096 $ 10,970  
Total 30 day delinquency rate 1.63% 2.15%  
Consumer, excluding credit card | Student and other | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 1,051 $ 1,143  
Consumer, excluding credit card | Student and other | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,224 1,259  
Consumer, excluding credit card | Student and other | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 679 729  
Consumer, excluding credit card | Student and other | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 839 868  
Consumer, excluding credit card | Student and other | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 516 521  
Consumer, excluding credit card | Student and other | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 366 378  
Consumer, excluding credit card | Student and other | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 212 235  
Consumer, excluding credit card | Student and other | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 236 239  
Consumer, excluding credit card | Student and other | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 415 466  
Consumer, excluding credit card | Student and other | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 559 629  
Consumer, excluding credit card | Student and other | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,999 4,503  
Consumer, excluding credit card | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 91,559 $ 85,564  
Total 30 day delinquency rate 1.42% 1.47%  
Consumer, excluding credit card | Total other consumer | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 26,782 $ 24,441  
Consumer, excluding credit card | Total other consumer | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 891 743  
Consumer, excluding credit card | Total other consumer | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 210 213  
Consumer, excluding credit card | Total other consumer | California      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 11,767 10,445  
Consumer, excluding credit card | Total other consumer | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 8,457 8,108  
Consumer, excluding credit card | Total other consumer | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 5,816 5,277  
Consumer, excluding credit card | Total other consumer | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 9,918 9,102  
Consumer, excluding credit card | Total other consumer | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 4,300 3,649  
Consumer, excluding credit card | Total other consumer | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 2,864 2,774  
Consumer, excluding credit card | Total other consumer | Washington      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,611 1,512  
Consumer, excluding credit card | Total other consumer | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,474 3,325  
Consumer, excluding credit card | Total other consumer | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,326 3,474  
Consumer, excluding credit card | Total other consumer | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 4,262 4,140  
Consumer, excluding credit card | Total other consumer | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 35,764 33,758  
Consumer, excluding credit card | In the process of active or suspended foreclosure      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 1,200 1,500  
Consumer, excluding credit card | Current | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 59,442 53,866  
Consumer, excluding credit card | Current | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 20,887 19,710  
Consumer, excluding credit card | Current | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 9,405 10,080  
Consumer, excluding credit card | Current | Student loan | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 3,800 4,300  
Consumer, excluding credit card | Current | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 89,734 83,656  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 804 663  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 215 208  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 445 576  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student loan | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 299 364  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student loan | Minimum | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 30 days    
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student loan | Maximum | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 119 days    
Consumer, excluding credit card | Days Past Due, 30 to 119 | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 1,464 1,447  
Consumer, excluding credit card | Days Past Due, 120 or More | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 9 7  
Consumer, excluding credit card | Days Past Due, 120 or More | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 106 140  
Consumer, excluding credit card | Days Past Due, 120 or More | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 246 314  
Consumer, excluding credit card | Days Past Due, 120 or More | Student loan | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 227 290  
Consumer, excluding credit card | Days Past Due, 120 or More | Student loan | Minimum | Student Loans Insured or Guaranteed by U.S. Government Agencies [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 120 days    
Consumer, excluding credit card | Days Past Due, 120 or More | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 361 461  
Consumer, excluding credit card | 90 or more days past due and still accruing | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 0 0  
Consumer, excluding credit card | 90 or more days past due and still accruing | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 0 0  
Consumer, excluding credit card | 90 or more days past due and still accruing | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 290 367  
Consumer, excluding credit card | 90 or more days past due and still accruing | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 290 367  
Consumer, excluding credit card | Nonaccrual | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 116 115  
Consumer, excluding credit card | Nonaccrual | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 263 279  
Consumer, excluding credit card | Nonaccrual | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 242 270  
Consumer, excluding credit card | Nonaccrual | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans 621 664  
Consumer, excluding credit card | Days Past Due, 30 or More, and Still Accruing | Student and other | Student and Other Loans Insured or Guaranteed by U.S. Government Agencies      
Loans and Leases Receivable Disclosure [Line Items]      
Total retained loans $ 526 $ 654  
Consumer, excluding credit card | Days Past Due, 30 or More, and Still Accruing | Total other consumer | Minimum | Student and Other Loans Insured or Guaranteed by U.S. Government Agencies      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 30 days