EARNINGS PER COMMON SHARE COMPUTATION (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 311	$ 431	$ 565	$ 861
Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares)	149,386	149,473	149,273	149,982
Shares used to compute diluted earnings per common share (in shares)	150,806	151,148	150,851	151,748
Basic earnings per common share (in dollars per share)	$ 2.08	$ 2.88	$ 3.79	$ 5.74
Diluted earnings per common share (in dollars per share)	$ 2.06	$ 2.85	$ 3.75	$ 5.67
Number of antidilutive stock options and restricted stock excluded from computation (in shares)	676	314	980	516
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)	218	193	218	205
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)	1,202	1,482	1,360	1,561