Earnings Per Share (Detail) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Common stock, par value	$ 0.10		$ 0.10		$ 0.10
Weighted average basic common shares outstanding	129	132	129	132
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2	2	0	0
Weighted average diluted common shares outstanding	131	134	129	132
Restricted Stock Units (RSUs) [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Securities excluded from the weighted average dilutive common shares outstanding because their inclusion would have been anti-dilutive:	0	0	1	1
Employee Stock Option [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Securities excluded from the weighted average dilutive common shares outstanding because their inclusion would have been anti-dilutive:	1	1	1	1
Restricted Stock [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Securities excluded from the weighted average dilutive common shares outstanding because their inclusion would have been anti-dilutive:	0	0	1	0