EARNINGS PER COMMON SHARE COMPUTATION (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 491	$ 1,115
Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares)	137,903	147,824
Shares used to compute diluted earnings per common share (in shares)	138,830	148,872
Basic earnings per common share (in dollars per share)	$ 3.56	$ 7.54
Diluted earnings per common share (in dollars per share)	$ 3.53	$ 7.49
Number of antidilutive stock options and restricted stock excluded from computation (in shares)	645	938
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)	213	199
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)	714	849