EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator (basic and diluted):
Net income	$ 348	$ 297	$ 986	$ 763
Less: Preferred stock dividends	7	7	14	14
Net income available to common stockholders	$ 341	$ 290	$ 972	$ 749
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	500,861,076	519,458,976	505,529,991	525,477,273
Dilutive common shares: share-based awards (in Shares)	1,296,308	1,663,490	1,532,814	1,784,111
Weighted-average common shares outstanding - diluted (in Shares)	502,157,384	521,122,466	507,062,805	527,261,384
Earnings per common share:
Basic (in Dollars per Share)	$ 0.68	$ 0.56	$ 1.92	$ 1.43
Diluted (in Dollars per Share)	$ 0.68	$ 0.56	$ 1.92	$ 1.42
Share-based awards excluded from diluted earnings per share computation (in Shares)	4,181	0	378,378	0