EARNINGS PER COMMON SHARE COMPUTATION (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 1,115	$ 254
Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares)	147,824	149,161
Shares used to compute diluted earnings per common share (in shares)	148,872	150,896
Basic earnings per common share (in dollars per share)	$ 7.54	$ 1.70
Diluted earnings per common share (in dollars per share)	$ 7.49	$ 1.68
Number of antidilutive stock options and restricted stock excluded from computation (in shares)	938	1,285
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)	199	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)	849	1,517