EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator (basic and diluted):
Net income	$ 388	$ 320
Less: Preferred stock dividends	7	7
Net income available to common stockholders	$ 381	$ 313
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	487,500,618	509,451,450
Dilutive common shares: share-based awards (in Shares)	1,766,208	1,896,750
Weighted-average common shares outstanding - diluted (in Shares)	489,266,826	511,348,200
Earnings per common share:
Basic (in Dollars per Share)	$ 0.78	$ 0.61
Diluted (in Dollars per Share)	$ 0.78	$ 0.61
Share-based awards excluded from diluted earnings per share computation (in Shares)	0	322,000