EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator (basic and diluted):
Net income	$ 223	$ 209
Less: Preferred stock dividends	7	0
Net income available to common stockholders	$ 216	$ 209
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	528,070,648	546,291,363
Dilutive common shares: share-based awards (in Shares)	2,375,540	3,507,354
Weighted-average common shares outstanding - diluted (in Shares)	530,446,188	549,798,717
Earnings per common share:
Basic (in Dollars per Share)	$ 0.41	$ 0.38
Diluted (in Dollars per Share)	$ 0.41	$ 0.38