Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE (Details)

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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Feb. 22, 2018
Basic earnings per common share:          
Net income $ 378 $ 275 $ 1,059 $ 754  
Preferred stock dividends (18) (19) (51) (57)  
Net income available to common shareholders 360 256 1,008 697  
Effect of assumed preferred stock conversion 0 0 0 0  
Net income applicable to diluted earnings per share $ 360 $ 256 $ 1,008 $ 697  
Average common shares issued and outstanding (in shares) 1,084,536,000 1,086,038,000 1,090,570,000 1,087,115,000  
Basic earnings per common share (in usd per share) $ 0.33 $ 0.24 $ 0.92 $ 0.64  
Dilutive potential common shares:          
Stock options and restricted stock units and awards 15,655,000 17,079,000 17,105,000 17,515,000  
Shares held in deferred compensation plans 3,549,000 3,228,000 3,416,000 3,096,000  
Dilutive impact of Preferred Stock 0 0 5,887,000 0  
Other 0 146,000 0 152,000  
Dilutive potential common shares 19,204,000 20,453,000 26,408,000 20,763,000  
Total diluted average common shares issued and outstanding (in shares) 1,103,740,000 1,106,491,000 1,116,978,000 1,107,878,000  
Diluted earnings per common share (in usd per share) $ 0.33 $ 0.23 $ 0.90 $ 0.63  
Employee Stock Option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Options outstanding to purchase common stock shares having antidilutive effect 1,600,000 1,500,000 2,000,000 900,000  
Series A Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock, dividend payment rate, variable 0.085        
Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares issued upon conversion of convertible preferred stock (in shares)         30,300,000.0