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BUSINESS OPERATING SEGMENTS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | $ 1,121 | $ 1,026 | $ 2,212 | $ 2,031
Noninterest income | 388 | 370 | 759 | 749
Total revenue | 1,509 | 1,396 | 2,971 | 2,780
Noninterest expense | 875 | 864 | 1,758 | 1,718
Profit before provision for credit losses | 634 | 532 | 1,213 | 1,062
Provision for credit losses | 85 | 70 | 163 | 166
Income before income tax expense | 549 | 462 | 1,050 | 896
Income tax expense | 124 | 144 | 237 | 258
NET INCOME | 425 | 318 | 813 | 638
Total average assets | 153,253 | 149,878 | 152,393 | 149,335
Operating Segments | Consumer Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 759 | 657 | 1,492 | 1,295
Noninterest income | 228 | 229 | 450 | 449
Total revenue | 987 | 886 | 1,942 | 1,744
Noninterest expense | 658 | 644 | 1,314 | 1,291
Profit before provision for credit losses | 329 | 242 | 628 | 453
Provision for credit losses | 66 | 60 | 138 | 124
Income before income tax expense | 263 | 182 | 490 | 329
Income tax expense | 66 | 64 | 123 | 116
NET INCOME | 197 | 118 | 367 | 213
Total average assets | 61,232 | 59,244 | 61,290 | 58,954
Operating Segments | Commercial Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 376 | 344 | 733 | 690
Noninterest income | 140 | 130 | 265 | 264
Total revenue | 516 | 474 | 998 | 954
Noninterest expense | 200 | 192 | 408 | 382
Profit before provision for credit losses | 316 | 282 | 590 | 572
Provision for credit losses | 9 | 1 | 5 | 20
Income before income tax expense | 307 | 281 | 585 | 552
Income tax expense | 70 | 94 | 133 | 185
NET INCOME | 237 | 187 | 452 | 367
Total average assets | 52,170 | 49,731 | 51,286 | 49,488
Other Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | (14) | 25 | (13) | 46
Noninterest income | 20 | 11 | 44 | 36
Total revenue | 6 | 36 | 31 | 82
Noninterest expense | 17 | 28 | 36 | 45
Profit before provision for credit losses | (11) | 8 | (5) | 37
Provision for credit losses | 10 | 9 | 20 | 22
Income before income tax expense | (21) | (1) | (25) | 15
Income tax expense | (12) | (14) | (19) | (43)
NET INCOME | (9) | 13 | (6) | 58
Total average assets | $ 39,851 | $ 40,903 | $ 39,817 | $ 40,893

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