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BUSINESS OPERATING SEGMENTS - Schedule of Business Operating Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 4,586 | $ 4,614 | $ 4,532
Noninterest income | 2,319 | 1,877 | 1,596
Total revenue | 6,905 | 6,491 | 6,128
Noninterest expense | 3,991 | 3,847 | 3,619
Profit (loss) before provision for credit losses | 2,914 | 2,644 | 2,509
Provision for credit losses | 1,616 | 393 | 326
Income before income tax expense | 1,298 | 2,251 | 2,183
Income tax expense | 241 | 460 | 462
NET INCOME | 1,057 | 1,791 | 1,721
Total average assets | 176,442 | 162,176 | 154,553
Operating Segments | Consumer Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,311 | 3,182 | 3,064
Noninterest income | 1,655 | 1,156 | 973
Total revenue | 4,966 | 4,338 | 4,037
Noninterest expense | 2,964 | 2,851 | 2,723
Profit (loss) before provision for credit losses | 2,002 | 1,487 | 1,314
Provision for credit losses | 288 | 325 | 289
Income before income tax expense | 1,714 | 1,162 | 1,025
Income tax expense | 429 | 287 | 258
NET INCOME | 1,285 | 875 | 767
Total average assets | 72,022 | 66,240 | 62,444
Operating Segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 1,643 | 1,466 | 1,497
Noninterest income | 595 | 607 | 545
Total revenue | 2,238 | 2,073 | 2,042
Noninterest expense | 860 | 858 | 813
Profit (loss) before provision for credit losses | 1,378 | 1,215 | 1,229
Provision for credit losses | 398 | 97 | 26
Income before income tax expense | 980 | 1,118 | 1,203
Income tax expense | 206 | 248 | 276
NET INCOME | 774 | 870 | 927
Total average assets | 60,839 | 55,947 | 52,362
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (368) | (34) | (29)
Noninterest income | 69 | 114 | 78
Total revenue | (299) | 80 | 49
Noninterest expense | 167 | 138 | 83
Profit (loss) before provision for credit losses | (466) | (58) | (34)
Provision for credit losses | 930 | (29) | 11
Income before income tax expense | (1,396) | (29) | (45)
Income tax expense | (394) | (75) | (72)
NET INCOME | (1,002) | 46 | 27
Total average assets | $ 43,581 | $ 39,989 | $ 39,747

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