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BUSINESS OPERATING SEGMENTS - Assets by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | $ 1,160 | $ 1,166 | $ 2,320 | $ 2,326
Noninterest income | 590 | 462 | 1,087 | 890
Total revenue | 1,750 | 1,628 | 3,407 | 3,216
Noninterest expense | 979 | 951 | 1,991 | 1,888
Profit (loss) before provision for credit losses | 771 | 677 | 1,416 | 1,328
Provision for credit losses | 464 | 97 | 1,064 | 182
Income before income tax expense | 307 | 580 | 352 | 1,146
Income tax expense (benefit) | 54 | 127 | 65 | 254
NET INCOME | 253 | 453 | 287 | 892
Total average assets | 179,793 | 161,489 | 173,485 | 160,955
Operating Segments | Consumer Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 814 | 799 | 1,607 | 1,587
Noninterest income | 428 | 277 | 785 | 524
Total revenue | 1,242 | 1,076 | 2,392 | 2,111
Noninterest expense | 735 | 715 | 1,473 | 1,415
Profit (loss) before provision for credit losses | 507 | 361 | 919 | 696
Provision for credit losses | 80 | 78 | 177 | 145
Income before income tax expense | 427 | 283 | 742 | 551
Income tax expense (benefit) | 107 | 70 | 186 | 136
NET INCOME | 320 | 213 | 556 | 415
Total average assets | 71,634 | 65,485 | 70,024 | 65,247
Operating Segments | Commercial Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 419 | 371 | 784 | 743
Noninterest income | 144 | 149 | 269 | 299
Total revenue | 563 | 520 | 1,053 | 1,042
Noninterest expense | 213 | 217 | 434 | 426
Profit (loss) before provision for credit losses | 350 | 303 | 619 | 616
Provision for credit losses | 70 | 25 | 113 | 46
Income before income tax expense | 280 | 278 | 506 | 570
Income tax expense (benefit) | 59 | 62 | 106 | 127
NET INCOME | 221 | 216 | 400 | 443
Total average assets | 65,280 | 56,135 | 62,142 | 55,884
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | (73) | (4) | (71) | (4)
Noninterest income | 18 | 36 | 33 | 67
Total revenue | (55) | 32 | (38) | 63
Noninterest expense | 31 | 19 | 84 | 47
Profit (loss) before provision for credit losses | (86) | 13 | (122) | 16
Provision for credit losses | 314 | (6) | 774 | (9)
Income before income tax expense | (400) | 19 | (896) | 25
Income tax expense (benefit) | (112) | (5) | (227) | (9)
NET INCOME | (288) | 24 | (669) | 34
Total average assets | $ 42,879 | $ 39,869 | $ 41,319 | $ 39,824

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