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Loans - Consumer, Excluding Credit Card Loans, Other Consumer Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 889,907 $ 832,792 $ 747,508
Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 364,406 344,355 $ 294,979
Consumer, excluding credit card | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 65,814 $ 60,255  
Total 30 day delinquency rate 1.19% 1.35%  
90 or more days past due and still accruing $ 0 $ 0  
Nonaccrual loans 214 116  
Consumer, excluding credit card | Auto | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 13,899 11,277  
Consumer, excluding credit card | Auto | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 201 76  
Consumer, excluding credit card | Auto | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 94 0  
Consumer, excluding credit card | Auto | California      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 7,975 7,186  
Consumer, excluding credit card | Auto | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 7,041 6,457  
Consumer, excluding credit card | Auto | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 4,078 3,874  
Consumer, excluding credit card | Auto | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,984 3,678  
Consumer, excluding credit card | Auto | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,374 2,843  
Consumer, excluding credit card | Auto | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,194 2,340  
Consumer, excluding credit card | Auto | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,209 2,033  
Consumer, excluding credit card | Auto | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,567 1,550  
Consumer, excluding credit card | Auto | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,031 1,998  
Consumer, excluding credit card | Auto | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,814 1,713  
Consumer, excluding credit card | Auto | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 29,547 26,583  
Consumer, excluding credit card | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 22,698 $ 21,208  
Total 30 day delinquency rate 1.70% 1.51%  
90 or more days past due and still accruing $ 0 $ 0  
Nonaccrual loans 286 263  
Consumer, excluding credit card | Business banking | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 16,858 15,505  
Consumer, excluding credit card | Business banking | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 816 815  
Consumer, excluding credit card | Business banking | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 217 210  
Consumer, excluding credit card | Business banking | California      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 4,158 3,530  
Consumer, excluding credit card | Business banking | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,769 2,622  
Consumer, excluding credit card | Business banking | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,510 3,359  
Consumer, excluding credit card | Business banking | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,627 1,459  
Consumer, excluding credit card | Business banking | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,068 941  
Consumer, excluding credit card | Business banking | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,366 1,363  
Consumer, excluding credit card | Business banking | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,270 1,205  
Consumer, excluding credit card | Business banking | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,308 1,361  
Consumer, excluding credit card | Business banking | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 546 500  
Consumer, excluding credit card | Business banking | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 961 997  
Consumer, excluding credit card | Business banking | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 4,115 3,871  
Consumer, excluding credit card | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 8,989 $ 10,096  
Total 30 day delinquency rate 1.38% 1.63%  
90 or more days past due and still accruing $ 263 $ 290  
Nonaccrual loans 175 242  
Consumer, excluding credit card | Student and other | California      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 935 1,051  
Consumer, excluding credit card | Student and other | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 739 839  
Consumer, excluding credit card | Student and other | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,187 1,224  
Consumer, excluding credit card | Student and other | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 582 679  
Consumer, excluding credit card | Student and other | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 475 516  
Consumer, excluding credit card | Student and other | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 490 559  
Consumer, excluding credit card | Student and other | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 202 236  
Consumer, excluding credit card | Student and other | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 355 415  
Consumer, excluding credit card | Student and other | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 320 366  
Consumer, excluding credit card | Student and other | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 120 134  
Consumer, excluding credit card | Student and other | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,584 4,077  
Consumer, excluding credit card | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 97,501 $ 91,559  
Total 30 day delinquency rate 1.33% 1.42%  
90 or more days past due and still accruing $ 263 $ 290  
Nonaccrual loans 675 621  
Consumer, excluding credit card | Total other consumer | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 30,757 26,782  
Consumer, excluding credit card | Total other consumer | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,017 891  
Consumer, excluding credit card | Total other consumer | Criticized nonaccrual      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 311 210  
Consumer, excluding credit card | Total other consumer | California      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 13,068 11,767  
Consumer, excluding credit card | Total other consumer | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 10,549 9,918  
Consumer, excluding credit card | Total other consumer | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 8,775 8,457  
Consumer, excluding credit card | Total other consumer | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 6,193 5,816  
Consumer, excluding credit card | Total other consumer | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 4,917 4,300  
Consumer, excluding credit card | Total other consumer | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 4,050 4,262  
Consumer, excluding credit card | Total other consumer | Arizona      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,681 3,474  
Consumer, excluding credit card | Total other consumer | Michigan      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,230 3,326  
Consumer, excluding credit card | Total other consumer | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,897 2,864  
Consumer, excluding credit card | Total other consumer | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 2,895 2,844  
Consumer, excluding credit card | Total other consumer | All other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 37,246 34,531  
Consumer, excluding credit card | Student loan | Student loans insured by U.S. government agencies under the FFELP      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 3,300 3,800  
Consumer, excluding credit card | Current | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 65,029 59,442  
Consumer, excluding credit card | Current | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 22,312 20,887  
Consumer, excluding credit card | Current | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 8,397 9,405  
Consumer, excluding credit card | Current | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 95,738 89,734  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 773 804  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 247 215  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 374 445  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 1,394 1,464  
Consumer, excluding credit card | Days Past Due, 30 to 119 | Student loan | Student loans insured by U.S. government agencies under the FFELP      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 257 299  
Consumer, excluding credit card | Days Past Due, 120 or More | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 12 9  
Consumer, excluding credit card | Days Past Due, 120 or More | Business banking      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 139 106  
Consumer, excluding credit card | Days Past Due, 120 or More | Student and other      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 218 246  
Consumer, excluding credit card | Days Past Due, 120 or More | Total other consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 369 361  
Consumer, excluding credit card | Days Past Due, 120 or More | Student loan | Student loans insured by U.S. government agencies under the FFELP      
Loans and Leases Receivable Disclosure [Line Items]      
Retained 211 227  
Consumer, excluding credit card | Days Past Due, 30 or More, and Still Accruing | Student and other | Student loans insured by U.S. government agencies under the FFELP      
Loans and Leases Receivable Disclosure [Line Items]      
Retained $ 468 $ 526