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BUSINESS OPERATING SEGMENTS - Schedule of Business Operating Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 4,512 | $ 4,586 | $ 4,614
Noninterest income | 2,135 | 2,319 | 1,877
Total revenue | 6,647 | 6,905 | 6,491
Noninterest expense | 4,081 | 3,991 | 3,847
Profit (loss) before provision for credit losses | 2,566 | 2,914 | 2,644
Provision for credit losses | (411) | 1,616 | 393
Income before income tax expense | 2,977 | 1,298 | 2,251
Income tax expense | 658 | 241 | 460
NET INCOME | 2,319 | 1,057 | 1,791
Total average assets | 185,106 | 176,442 | 162,176
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Noninterest income | 2,135 | 2,319 | 1,877
Operating Segments | Consumer Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,562 | 3,311 | 3,182
Noninterest income | 1,223 | 1,655 | 1,156
Total revenue | 4,785 | 4,966 | 4,338
Noninterest expense | 2,987 | 2,964 | 2,851
Profit (loss) before provision for credit losses | 1,798 | 2,002 | 1,487
Provision for credit losses | 185 | 288 | 325
Income before income tax expense | 1,613 | 1,714 | 1,162
Income tax expense | 410 | 429 | 287
NET INCOME | 1,203 | 1,285 | 875
Total average assets | 75,509 | 72,022 | 66,240
Operating Segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 1,706 | 1,643 | 1,466
Noninterest income | 809 | 595 | 607
Total revenue | 2,515 | 2,238 | 2,073
Noninterest expense | 973 | 860 | 858
Profit (loss) before provision for credit losses | 1,542 | 1,378 | 1,215
Provision for credit losses | 156 | 398 | 97
Income before income tax expense | 1,386 | 980 | 1,118
Income tax expense | 300 | 206 | 248
NET INCOME | 1,086 | 774 | 870
Total average assets | 57,617 | 60,839 | 55,947
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | (756) | (368) | (34)
Total revenue | (653) | (299) | 80
Noninterest expense | 121 | 167 | 138
Profit (loss) before provision for credit losses | (774) | (466) | (58)
Provision for credit losses | (752) | 930 | (29)
Income before income tax expense | (22) | (1,396) | (29)
Income tax expense | (52) | (394) | (75)
NET INCOME | 30 | (1,002) | 46
Total average assets | $ 51,980 | $ 43,581 | $ 39,989

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