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Summary of Information about Stock Options Activity (Detail)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2011
USD ($)
Year
Investment
Mar. 31, 2011
JPY (¥)
Number of shares    
Outstanding at beginning of the year 1,370,380 1,370,380
Exercised (14,000) (14,000)
Forfeited or expired (134,020) (134,020)
Outstanding at end of year 1,222,360 1,222,360
Exercisable at end of year 1,222,360 1,222,360
Weighted average exercise price    
Outstanding at beginning of the year $ 219.62 [1] ¥ 18,261.00 [1]
Exercised $ 85.94 [1] ¥ 7,146.00 [1]
Forfeited or expired $ 208.15 [1] ¥ 17,308.00 [1]
Outstanding at end of year $ 222.41 [1] ¥ 18,493.00 [1]
Exercisable at end of year $ 222.41 [1] ¥ 18,493.00 [1]
Aggregate intrinsic value    
Outstanding at end of year $ 0 ¥ 0
Exercisable at end of year $ 0 ¥ 0
Weighted average remaining contractual life    
Outstanding at end of year 4.26 4.26
Exercisable at end of year 4.26 4.26
[1] The exercise prices of the granted options were adjusted in July 2009 for the issuance of new 18 million shares.