EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator (basic and diluted):
Net income	$ 449	$ 443	$ 1,341	$ 1,256
Less: Preferred stock dividends	17	7	50	14
Net income available to common stockholders	$ 432	$ 436	$ 1,291	$ 1,242
Denominator:
Weighted-average common shares outstanding - basic (in shares)	445,703,987	475,957,526	454,802,186	482,691,884
Dilutive common shares: share-based awards (in shares)	1,430,608	1,642,391	1,416,569	1,558,959
Weighted-average common shares outstanding - diluted (in shares)	447,134,595	477,599,917	456,218,755	484,250,843
Earnings per common share:
Basic (in dollars per share)	$ 0.97	$ 0.92	$ 2.84	$ 2.57
Diluted (in dollars per share)	$ 0.97	$ 0.91	$ 2.83	$ 2.57
Share-based awards excluded from diluted earnings per share computation (in shares)	772	0	359,952	0