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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator (basic and diluted):
Net income	$ 425	$ 318	$ 813	$ 638
Less: Preferred stock dividends	0	0	7	7
Net income available to common stockholders	$ 425	$ 318	$ 806	$ 631
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	484,744,354	506,371,846	486,114,872	507,903,141
Dilutive common shares: share-based awards (in Shares)	1,397,341	1,042,276	1,568,344	1,458,914
Weighted-average common shares outstanding - diluted (in Shares)	486,141,695	507,414,122	487,683,216	509,362,055
Earnings per common share:
Basic (in Dollars per Share)	$ 0.88	$ 0.63	$ 1.66	$ 1.24
Diluted (in Dollars per Share)	$ 0.88	$ 0.63	$ 1.65	$ 1.24
Share-based awards excluded from diluted earnings per share computation (in Shares)	0	530,781	0	343,692

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