EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator (basic and diluted):
Net income	$ 439	$ 388
Less: Preferred stock dividends	15	7
Net income available to common stockholders	$ 424	$ 381
Denominator:
Weighted-average common shares outstanding - basic (in shares)	460,713,172	487,500,618
Dilutive common shares: share-based awards (in shares)	1,807,508	1,766,208
Weighted-average common shares outstanding - diluted (in shares)	462,520,680	489,266,826
Earnings per common share:
Basic (in dollars per share)	$ 0.92	$ 0.78
Diluted (in dollars per share)	$ 0.92	$ 0.78
Share-based awards excluded from diluted earnings per share computation (in shares)	1,000,000	0