Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value of Option Award Estimated on Date of Grant Using Black-Scholes Option Pricing Model

The fair value of each option award was estimated on the date of grant using the Black-Scholes option pricing model that incorporates the assumptions presented below:

	Years ended December 31
	2011			2010			2009
Expected term of option (in years)		4.0			4.0			4.0
Expected volatility		36.44	%		38.00	%		40.08	%
Dividend yield		3.16	%		2.53	%		3.51	%
Risk-free interest rate		0.44	%		0.45	%		0.64	%

Summary of Option Activity Under Stock Option Plans

A summary of option activity under the stock option plans as of and for the years ended December 31, 2011, 2010 and 2009 is presented below:

	Shares			Weighted-average exercise price		Weighted-average remaining contractual term		Aggregate intrinsic value
				(Yen)		(Year)		(Millions of yen)
Outstanding at January 1, 2009		592,000		¥	5,502		3.3	¥	—
Granted		954,000			3,287
Forfeited		(34,000	)		4,851
Outstanding at December 31, 2009		1,512,000			4,119		3.0		588
Granted		890,000			4,573
Forfeited		(182,000	)		3,479
Outstanding at December 31, 2010		2,220,000			4,354		2.5		722
Granted		912,000			3,990
Exercised		(65,800	)		3,287
Forfeited		(24,000	)		4,282
Outstanding at December 31, 2011		3,042,200		¥	4,268		2.0	¥	88
Exercisable at December 31, 2011		1,274,200		¥	4,257		0.9	¥	88

Summary of Nonvested Shares

A summary of the status of the Company’s nonvested shares at December 31, 2011, and changes during the year ended December 31, 2011, is presented below:

	Year ended December 31, 2011
	Shares			Weighted-average grant-date  fair value
				(Yen)
Nonvested at January 1, 2011		1,662,000		¥	852
Granted		912,000			772
Vested		(782,000	)		699
Forfeited		(24,000	)		880
Nonvested at December 31, 2011		1,768,000			878