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BUSINESS OPERATING SEGMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 4,532 | $ 4,173 | $ 3,758
Noninterest income | 1,596 | 1,534 | 1,497
Total revenue | 6,128 | 5,707 | 5,255
Noninterest expense | 3,619 | 3,474 | 3,352
Profit (loss) before provision for credit losses | 2,509 | 2,233 | 1,903
Provision for credit losses | 326 | 321 | 369
Income before income tax expense | 2,183 | 1,912 | 1,534
Income tax expense | 462 | 260 | 489
NET INCOME | 1,721 | 1,652 | 1,045
Total average assets | 154,553 | 149,953 | 143,183
Operating Segments | Consumer Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,064 | 2,651 | 2,443
Noninterest income | 973 | 905 | 883
Total revenue | 4,037 | 3,556 | 3,326
Noninterest expense | 2,723 | 2,593 | 2,547
Profit (loss) before provision for credit losses | 1,314 | 963 | 779
Provision for credit losses | 289 | 265 | 243
Income before income tax expense | 1,025 | 698 | 536
Income tax expense | 258 | 246 | 191
NET INCOME | 767 | 452 | 345
Total average assets | 62,444 | 59,714 | 56,388
Operating Segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 1,497 | 1,411 | 1,288
Noninterest income | 545 | 538 | 466
Total revenue | 2,042 | 1,949 | 1,754
Noninterest expense | 813 | 772 | 741
Profit (loss) before provision for credit losses | 1,229 | 1,177 | 1,013
Provision for credit losses | 26 | 19 | 47
Income before income tax expense | 1,203 | 1,158 | 966
Income tax expense | 276 | 384 | 335
NET INCOME | 927 | 774 | 631
Total average assets | 52,362 | 49,747 | 47,159
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (29) | 111 | 27
Noninterest income | 78 | 91 | 148
Total revenue | 49 | 202 | 175
Noninterest expense | 83 | 109 | 64
Profit (loss) before provision for credit losses | (34) | 93 | 111
Provision for credit losses | 11 | 37 | 79
Income before income tax expense | (45) | 56 | 32
Income tax expense | (72) | (370) | (37)
NET INCOME | 27 | 426 | 69
Total average assets | $ 39,747 | $ 40,492 | $ 39,636

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