Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE (Details)

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EARNINGS PER SHARE (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
Feb. 22, 2018
Basic earnings per common share:                        
Net income $ 334 $ 378 $ 355 $ 326 $ 432 $ 275 $ 272 $ 207 $ 1,393 $ 1,186 $ 712  
Preferred stock dividends (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  
Average common shares issued and outstanding (in shares)                 1,081,542,000 1,084,686,000 904,438,000  
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:                        
Net income available to common shareholders $ 315 $ 360 $ 334 $ 314 $ 413 $ 256 $ 253 $ 188 $ 1,323 $ 1,110 $ 647  
Effect of assumed preferred stock conversion                 0 31 0  
Net income applicable to diluted earnings per share                 $ 1,323 $ 1,141 $ 647  
Dilutive potential common shares                        
Stock options and restricted stock units and awards (in shares)                 16,529,000 17,883,000 11,728,000  
Shares held in deferred compensation plans (in shares)                 3,511,000 3,160,000 2,486,000  
Dilutive impact of Preferred Stock                 4,403,000 30,330,000 0  
Other (in shares)                 0 127,000 138,000  
Dilutive potential common shares: (in shares)                 24,443,000 51,500,000 14,352,000  
Total diluted average common shares issued and outstanding (in shares)                 1,105,985,000 1,136,186,000 918,790,000  
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  
Stock Option                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Options outstanding to purchase common stock shares having antidilutive effect (in shares)                 2,000,000 1,000,000 3,000,000  
Series A Preferred Stock [Member]                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Preferred stock, dividend percentage   0.085             0.085      
Common Stock                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Number of shares issued for each share of convertible preferred stock                       30,300,000.0