Shareholders' Equity (Detail)	3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 CHF	Dec. 31, 2013 CHF	Nov. 30, 2013 November 2013 Stock Repurchase Plan [Member] USD ($)	Mar. 31, 2014 November 2013 Stock Repurchase Plan [Member] USD ($)	May 01, 2014 November 2013 Stock Repurchase Plan [Member] Subsequent Event [Member] USD ($)
Equity, Class of Treasury Stock [Line Items]
Share repurchase amount					$ 332,000,000	$ 53,000,000
Repurchase of outstanding common shares, shares					3,487,882	531,000
Share repurchase authorization remains					1,610,000,000	1,560,000,000
Common Shares in treasury, shares	4,857,768	4,857,768	3,038,477
Stock repurchase program, authorized amount				$ 2,000,000,000
Increase to dividend approved by shareholders in January	$ 0.12
Dividends declared per common share	$ 0.75	0.65
Par Value Reduction	$ 0.51	0.45
Common Shares, par value		26.59	27.04