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
Numerator (basic and diluted):
Net income	$ 443	$ 348	$ 1,256	$ 986
Less: Preferred stock dividends	7	7	14	14
Net income available to common stockholders	$ 436	$ 341	$ 1,242	$ 972
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	475,957,526	500,861,076	482,691,884	505,529,991
Dilutive common shares: share-based awards (in Shares)	1,642,391	1,296,308	1,558,959	1,532,814
Weighted-average common shares outstanding - diluted (in Shares)	477,599,917	502,157,384	484,250,843	507,062,805
Earnings per common share:
Basic (in Dollars per Share)	$ 0.92	$ 0.68	$ 2.57	$ 1.92
Diluted (in Dollars per Share)	$ 0.91	$ 0.68	$ 2.57	$ 1.92
Share-based awards excluded from diluted earnings per share computation (in Shares)	0	4,000	0	378,000