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Parent Company (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Non-interest revenues |  |  |  |  |  |  |  |  |  |  |
Gain on sale of securities |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Other |  |  |  |  |  |  |  |  | 1,732 | 2,029 | 2,033
Total non-interest revenues |  |  |  |  |  |  |  |  | 27,030 | 26,348 | 26,896
Interest income |  |  |  |  |  |  |  |  | 8,553 | 7,475 | 7,545
Interest expense |  |  |  |  |  |  |  |  | 2,112 | 1,704 | 1,623
Total revenues net of interest expense | $ 8,839 | $ 8,436 | $ 8,307 | $ 7,889 | $ 8,022 | $ 7,774 | $ 8,235 | $ 8,088 | 33,471 | 32,119 | 32,818
Expenses |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 5,258 | 5,259 | 4,976
Other |  |  |  |  |  |  |  |  | 5,776 | 5,162 | 6,793
Total Expenses |  |  |  |  |  |  |  |  | 23,298 | 21,997 | 22,892
Pretax loss | 1,821 | 1,827 | 1,949 | 1,817 | 1,161 | 1,735 | 3,016 | 2,184 | 7,414 | 8,096 | 7,938
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 4,678 | 2,688 | 2,775
Net income | $ (1,197) | $ 1,356 | $ 1,340 | $ 1,237 | $ 825 | $ 1,142 | $ 2,015 | $ 1,426 | 2,736 | 5,408 | 5,163
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Non-interest revenues |  |  |  |  |  |  |  |  |  |  |
Gain on sale of securities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  | 358 | 391 | 400
Total non-interest revenues |  |  |  |  |  |  |  |  | 358 | 391 | 400
Interest income |  |  |  |  |  |  |  |  | 258 | 196 | 172
Interest expense |  |  |  |  |  |  |  |  | 493 | 515 | 526
Total revenues net of interest expense |  |  |  |  |  |  |  |  | 123 | 72 | 46
Expenses |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  | 362 | 388 | 341
Other |  |  |  |  |  |  |  |  | 553 | 510 | 443
Total Expenses |  |  |  |  |  |  |  |  | 915 | 898 | 784
Pretax loss |  |  |  |  |  |  |  |  | (792) | (826) | (738)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (354) | (327) | (268)
Net loss before equity in net income of subsidiaries and affiliates |  |  |  |  |  |  |  |  | (438) | (499) | (470)
Equity in net income of subsidiaries and affiliates |  |  |  |  |  |  |  |  | 3,174 | 5,907 | 5,633
Net income |  |  |  |  |  |  |  |  | $ 2,736 | $ 5,408 | $ 5,163

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