EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator (basic and diluted):
Net income	$ 318	$ 243	$ 638	$ 466
Less: Preferred stock dividends	0	0	7	7
Net income available to common stockholders	$ 318	$ 243	$ 631	$ 459
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	506,371,846	528,968,330	507,903,141	528,519,489
Dilutive common shares: share-based awards (in Shares)	1,042,276	1,396,873	1,458,914	1,877,382
Weighted-average common shares outstanding - diluted (in Shares)	507,414,122	530,365,203	509,362,055	530,396,871
Earnings per common share:
Basic (in Dollars per Share)	$ 0.63	$ 0.46	$ 1.24	$ 0.87
Diluted (in Dollars per Share)	$ 0.63	$ 0.46	$ 1.24	$ 0.87
Share-based awards excluded from diluted earnings per share computation (in Shares)	530,781	0	343,692	0