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BUSINESS OPERATING SEGMENTS - Assets by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net interest income | $ 1,160 | $ 1,160
Noninterest income | 497 | 428
Total revenue | 1,657 | 1,588
Noninterest expense | 1,012 | 937
Profit (loss) before provision for credit losses | 645 | 651
Provision for credit losses | 600 | 85
Income before income tax expense | 45 | 566
Income tax expense (benefit) | 11 | 127
NET INCOME | 34 | 439
Total average assets | 167,177 | 160,415
Operating Segments | Consumer Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 793 | 788
Noninterest income | 357 | 247
Total revenue | 1,150 | 1,035
Noninterest expense | 738 | 700
Profit (loss) before provision for credit losses | 412 | 335
Provision for credit losses | 97 | 67
Income before income tax expense | 315 | 268
Income tax expense (benefit) | 79 | 66
NET INCOME | 236 | 202
Total average assets | 68,415 | 65,007
Operating Segments | Commercial Banking |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 365 | 372
Noninterest income | 125 | 150
Total revenue | 490 | 522
Noninterest expense | 221 | 209
Profit (loss) before provision for credit losses | 269 | 313
Provision for credit losses | 43 | 21
Income before income tax expense | 226 | 292
Income tax expense (benefit) | 47 | 65
NET INCOME | 179 | 227
Total average assets | 59,005 | 55,630
Other |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 2 | 0
Noninterest income | 15 | 31
Total revenue | 17 | 31
Noninterest expense | 53 | 28
Profit (loss) before provision for credit losses | (36) | 3
Provision for credit losses | 460 | (3)
Income before income tax expense | (496) | 6
Income tax expense (benefit) | (115) | (4)
NET INCOME | (381) | 10
Total average assets | $ 39,757 | $ 39,778

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