Capital Stock - Additional Information (Detail) (USD $)	1 Months Ended			12 Months Ended
	Nov. 30, 2013	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Capital Stock [Line Items]
Common stock, shares authorized				1,800,000,000	1,800,000,000
Initial public offering of shares common stock			87,719,300
Initial public offering of shares of common stock, price per share			$ 30.00
Proceeds from issuance of initial public offering			$ 2,506,000,000
Repurchase of common stock	10,656,436	80,771,143
Repurchase of common stock, per share	$ 46.92	$ 18.61
Shares repurchased as percentage of total shares outstanding		15.60%
Value of distribution per share					$ 6.50
Value of distribution					3,142,000,000
Reduction of non vested stock options on exercise price of share-based awards					$ 6.50
Share Based Compensation Nonvested Distribution Declared				$ 0		$ 0
Minimum [Member]
Capital Stock [Line Items]
Number of directors as per the amended and restated by-laws				3