EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator (basic and diluted):
Net income	$ 220	$ 189	$ 619	$ 668
Less: Preferred stock dividends	7	0	7	0
Net income available to common stockholders	$ 213	$ 189	$ 612	$ 668
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	530,985,255	559,998,324	538,279,222	559,998,324
Dilutive common shares: share-based awards (in Shares)	2,412,903	245,423	2,647,139	82,707
Weighted-average common shares outstanding - diluted (in Shares)	533,398,158	560,243,747	540,926,361	560,081,031
Earnings per common share:
Basic (in Dollars per Share)	$ 0.40	$ 0.34	$ 1.14	$ 1.19
Diluted (in Dollars per Share)	$ 0.40	$ 0.34	$ 1.13	$ 1.19