Earnings Per Share Computations and Antidilutive Securities Excluded (Detail) - $ / shares shares in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 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
Weighted average basic common shares outstanding		129	132
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	[1]	0	0
Weighted average diluted common shares outstanding		129	132
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
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:		1	0

[1] (1) Excludes restricted stock units of 1 for both the three months ended March 31, 2016 and 2015; and stock options of 1 and zero for the three months ended March 31, 2016 and 2015, respectively, because their inclusion would have been anti-dilutive.