EARNINGS PER COMMON SHARE COMPUTATION (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 650	$ 311	$ 1,765	$ 565
Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares)	144,600	149,386	146,212	149,273
Shares used to compute diluted earnings per common share (in shares)	145,634	150,806	147,253	150,851
Basic earnings per common share (in dollars per share)	$ 4.49	$ 2.08	$ 12.07	$ 3.79
Diluted earnings per common share (in dollars per share)	$ 4.46	$ 2.06	$ 11.98	$ 3.75
Number of antidilutive stock options and restricted stock excluded from computation (in shares)	449	676	693	980
Employee stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock (in shares)	158	218	179	218
Restricted stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock (in shares)	876	1,202	862	1,360