Share Repurchase Program and Dividend - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Feb. 10, 2015	Jan. 27, 2015	Mar. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, new authorized amount		$ 2,000,000,000
Share repurchase program completion date		Dec. 31, 2016
Cash dividends declared per common share			$ 0.10
Total cash payment for dividends			70,000,000
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased (in shares)	0.1		3.8
Aggregate stock repurchase price	$ 4,000,000		$ 190,000,000
Average cost per share			$ 49.47
Cash dividends declared per common share		$ 0.10
Common Stock [Member] | Installment One Current Fiscal Year [Member]
Equity, Class of Treasury Stock [Line Items]
Dividends payable, declaration date			Jan. 27, 2015
Dividends payable, record date			Feb. 09, 2015
Dividends payable, payable date			Feb. 23, 2015