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BUSINESS OPERATING SEGMENTS - Assets by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Net interest income | $ 1,442 | $ 1,643
Noninterest income | 517 | 485
Total revenue | 1,959 | 2,128
Noninterest expense | 1,358 | 1,296
Profit (loss) before provision (benefit) for credit losses | 601 | 832
Provision (benefit) for credit losses | 171 | 168
Income before income tax expense | 430 | 664
Income tax expense (benefit) | 96 | 153
NET INCOME | 334 | 511
Total average assets | 220,770 | 222,711
Operating Segments | Consumer Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 1,093 | 1,011
Noninterest income | 258 | 256
Total revenue | 1,351 | 1,267
Noninterest expense | 903 | 857
Profit (loss) before provision (benefit) for credit losses | 448 | 410
Provision (benefit) for credit losses | 81 | 63
Income before income tax expense | 367 | 347
Income tax expense (benefit) | 95 | 90
NET INCOME | 272 | 257
Total average assets | 73,833 | 71,872
Operating Segments | Commercial Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 514 | 597
Noninterest income | 227 | 201
Total revenue | 741 | 798
Noninterest expense | 317 | 331
Profit (loss) before provision (benefit) for credit losses | 424 | 467
Provision (benefit) for credit losses | 81 | 47
Income before income tax expense | 343 | 420
Income tax expense (benefit) | 84 | 101
NET INCOME | 259 | 319
Total average assets | 70,100 | 78,891
Operating Segments | Non-Core |  |
Segment Reporting Information [Line Items] |  |
Net interest income | (37) | (15)
Noninterest income | 0 | 0
Total revenue | (37) | (15)
Noninterest expense | 25 | 32
Profit (loss) before provision (benefit) for credit losses | (62) | (47)
Provision (benefit) for credit losses | 19 | 21
Income before income tax expense | (81) | (68)
Income tax expense (benefit) | (21) | (18)
NET INCOME | (60) | (50)
Total average assets | 10,554 | 15,686
Other |  |
Segment Reporting Information [Line Items] |  |
Net interest income | (128) | 50
Noninterest income | 32 | 28
Total revenue | (96) | 78
Noninterest expense | 113 | 76
Profit (loss) before provision (benefit) for credit losses | (209) | 2
Provision (benefit) for credit losses | (10) | 37
Income before income tax expense | (199) | (35)
Income tax expense (benefit) | (62) | (20)
NET INCOME | (137) | (15)
Total average assets | $ 66,283 | $ 56,262

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