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BUSINESS OPERATING SEGMENTS - Schedule of Business Operating Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 4,614 | $ 4,532 | $ 4,173
Noninterest income | 1,877 | 1,596 | 1,534
Total revenue | 6,491 | 6,128 | 5,707
Noninterest expense | 3,847 | 3,619 | 3,474
Profit (loss) before provision for credit losses | 2,644 | 2,509 | 2,233
Provision for credit losses | 393 | 326 | 321
Income before income tax expense | 2,251 | 2,183 | 1,912
Income tax expense | 460 | 462 | 260
NET INCOME | 1,791 | 1,721 | 1,652
Total average assets | 162,176 | 154,553 | 149,953
Operating Segments | Consumer Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,182 | 3,064 | 2,651
Noninterest income | 1,156 | 973 | 905
Total revenue | 4,338 | 4,037 | 3,556
Noninterest expense | 2,851 | 2,723 | 2,593
Profit (loss) before provision for credit losses | 1,487 | 1,314 | 963
Provision for credit losses | 325 | 289 | 265
Income before income tax expense | 1,162 | 1,025 | 698
Income tax expense | 287 | 258 | 246
NET INCOME | 875 | 767 | 452
Total average assets | 66,240 | 62,444 | 59,714
Operating Segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 1,466 | 1,497 | 1,411
Noninterest income | 607 | 545 | 538
Total revenue | 2,073 | 2,042 | 1,949
Noninterest expense | 858 | 813 | 772
Profit (loss) before provision for credit losses | 1,215 | 1,229 | 1,177
Provision for credit losses | 97 | 26 | 19
Income before income tax expense | 1,118 | 1,203 | 1,158
Income tax expense | 248 | 276 | 384
NET INCOME | 870 | 927 | 774
Total average assets | 55,947 | 52,362 | 49,747
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (34) | (29) | 111
Noninterest income | 114 | 78 | 91
Total revenue | 80 | 49 | 202
Noninterest expense | 138 | 83 | 109
Profit (loss) before provision for credit losses | (58) | (34) | 93
Provision for credit losses | (29) | 11 | 37
Income before income tax expense | (29) | (45) | 56
Income tax expense | (75) | (72) | (370)
NET INCOME | 46 | 27 | 426
Total average assets | $ 39,989 | $ 39,747 | $ 40,492

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