EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator (basic and diluted):
Net income	$ 243	$ 190	$ 466	$ 399
Less: Preferred stock dividends	0	0	7	0
Net income available to common stockholders	$ 243	$ 190	$ 459	$ 399
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	528,968,330	537,729,248	528,519,489	541,986,653
Dilutive common shares: share-based awards (in Shares)	1,396,873	2,180,118	1,877,382	2,817,615
Weighted-average common shares outstanding - diluted (in Shares)	530,365,203	539,909,366	530,396,871	544,804,268
Earnings per common share:
Basic (in Dollars per Share)	$ 0.46	$ 0.35	$ 0.87	$ 0.74
Diluted (in Dollars per Share)	$ 0.46	$ 0.35	$ 0.87	$ 0.73