EARNINGS PER COMMON SHARE COMPUTATION (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 450	$ 314	$ 1,015	$ 1,175
Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares)	149,417	148,889	149,321	149,617
Shares used to compute diluted earnings per common share (in shares)	150,904	150,466	150,869	151,321
Basic earnings per common share (in dollars per share)	$ 3.01	$ 2.11	$ 6.80	$ 7.85
Diluted earnings per common share (in dollars per share)	$ 2.98	$ 2.09	$ 6.73	$ 7.77
Number of antidilutive stock options and restricted stock excluded from computation (in shares)	658	320	873	451
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)	210	182	216	198
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)	1,277	1,395	1,332	1,506