EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator (basic and diluted):
Net income	$ 297	$ 220	$ 763	$ 619
Less: Preferred stock dividends	7	7	14	7
Net income available to common stockholders	$ 290	$ 213	$ 749	$ 612
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	519,458,976	530,985,255	525,477,273	538,279,222
Dilutive common shares: share-based awards (in Shares)	1,663,490	2,412,903	1,784,111	2,647,139
Weighted-average common shares outstanding - diluted (in Shares)	521,122,466	533,398,158	527,261,384	540,926,361
Earnings per common share:
Basic (in Dollars per Share)	$ 0.56	$ 0.40	$ 1.43	$ 1.14
Diluted (in Dollars per Share)	$ 0.56	$ 0.40	$ 1.42	$ 1.13