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Parent Company (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Non-interest revenues                      
Gain on sale of securities                 $ 9 $ 1 $ 100
Other                 2,029 2,033 2,989
Total non-interest revenues                 26,348 26,896 28,716
Interest income                 7,475 7,545 7,179
Interest expense                 (1,704) (1,623) (1,707)
Total revenues net of interest expense $ 8,022 $ 7,774 $ 8,235 $ 8,088 $ 8,391 $ 8,193 $ 8,284 $ 7,950 32,119 32,818 34,188
Expenses                      
Salaries and employee benefits                 5,259 4,976 6,095
Other                 5,162 6,793 6,089
Total                 21,997 22,892 23,153
Pretax loss 1,161 1,735 3,016 2,184 1,454 1,938 2,230 2,316 8,096 7,938 8,991
Income tax provision (benefit)                 2,688 2,775 3,106
Net income $ 825 $ 1,142 $ 2,015 $ 1,426 $ 899 $ 1,266 $ 1,473 $ 1,525 5,408 5,163 5,885
Parent Company [Member]                      
Non-interest revenues                      
Gain on sale of securities                 0 0 99
Other                 391 400 270
Total non-interest revenues                 391 400 369
Interest income                 196 172 141
Interest expense                 515 526 543
Total revenues net of interest expense                 72 46 (33)
Expenses                      
Salaries and employee benefits                 388 341 275
Other                 510 443 357
Total                 898 784 632
Pretax loss                 (826) (738) (665)
Income tax provision (benefit)                 (327) (268) (249)
Net loss before equity in net income of subsidiaries and affiliates                 (499) (470) (416)
Equity in net income of subsidiaries and affiliates                 5,907 5,633 6,301
Net income                 $ 5,408 $ 5,163 $ 5,885