Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Disclosure - Stockholders' Equity - Additional Information (Detail) [Line Items]
Shares repurchased | shares	0
Remaining capacity for authorized repurchase shares | $	$ 458
Dividends paid | $	$ 63
Dividends paid per share | $ / shares	$ 0.375
Dividends record date	Mar. 14, 2016
Maximum [Member]
Disclosure - Stockholders' Equity - Additional Information (Detail) [Line Items]
Common stock issued as a result of option exercises | shares	100,000