Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details)

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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 1,056 $ 1,007 $ 972 $ 914 $ 894 $ 873 $ 846 $ 820 $ 3,949 $ 3,433 $ 2,632
Interest expense 223 205 188 144 124 115 101 91 760 431 263
Net interest income 833 802 784 770 770 758 745 729 3,189 3,002 2,369
Provision for credit losses 60 53 56 66 65 43 25 68 235 201 191
Noninterest income 329 342 336 314 340 330 325 312 1,321 1,307 1,150
Noninterest expense 711 651 652 633 633 680 694 707 2,647 2,714 2,408
Income before income taxes 391 440 412 385 412 365 351 266 1,628 1,394 920
Provision for income taxes 57 62 57 59 (20) 90 79 59 235 208 208
Net income 334 378 355 326 432 275 272 207 1,393 1,186 712
Dividends on preferred shares 19 18 21 12 19 19 19 19 70 76 65
Net income available to common shareholders $ 315 $ 360 $ 334 $ 314 $ 413 $ 256 $ 253 $ 188 $ 1,323 $ 1,110 $ 647
Basic earnings per common share (in USD per share) $ 0.30 $ 0.33 $ 0.30 $ 0.29 $ 0.38 $ 0.24 $ 0.23 $ 0.17 $ 1.22 $ 1.02 $ 0.72
Diluted earnings per common share (in USD per share) $ 0.29 $ 0.33 $ 0.30 $ 0.28 $ 0.37 $ 0.23 $ 0.23 $ 0.17 $ 1.20 $ 1.00 $ 0.70