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BUSINESS OPERATING SEGMENTS - Assets by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Net interest income | $ 1,117 | $ 1,160
Noninterest income | 542 | 497
Total revenue | 1,659 | 1,657
Noninterest expense | 1,018 | 1,012
Profit (loss) before provision for credit losses | 641 | 645
Provision for credit losses | (140) | 600
Income before income tax expense | 781 | 45
Income tax expense (benefit) | 170 | 11
NET INCOME | 611 | 34
Total average assets | 182,569 | 167,177
Operating Segments | Consumer Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 863 | 793
Noninterest income | 351 | 357
Total revenue | 1,214 | 1,150
Noninterest expense | 750 | 738
Profit (loss) before provision for credit losses | 464 | 412
Provision for credit losses | 59 | 97
Income before income tax expense | 405 | 315
Income tax expense (benefit) | 103 | 79
NET INCOME | 302 | 236
Total average assets | 75,283 | 68,415
Operating Segments | Commercial Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 421 | 365
Noninterest income | 170 | 125
Total revenue | 591 | 490
Noninterest expense | 227 | 221
Profit (loss) before provision for credit losses | 364 | 269
Provision for credit losses | 101 | 43
Income before income tax expense | 263 | 226
Income tax expense (benefit) | 52 | 47
NET INCOME | 211 | 179
Total average assets | 57,738 | 59,005
Other |  |
Segment Reporting Information [Line Items] |  |
Net interest income | (167) | 2
Noninterest income | 21 | 15
Total revenue | (146) | 17
Noninterest expense | 41 | 53
Profit (loss) before provision for credit losses | (187) | (36)
Provision for credit losses | (300) | 460
Income before income tax expense | 113 | (496)
Income tax expense (benefit) | 15 | (115)
NET INCOME | 98 | (381)
Total average assets | $ 49,548 | $ 39,757

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