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Composition of Short Term Debt and Weighted Average Contract Interest Rate on Short Term Debt (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Short-term Debt [Line Items]    
Short-term debt ¥ 309,591 ¥ 420,726
Weighted average rate 2.00% 1.10%
Japan | Bank Borrowings
    
Short-term Debt [Line Items]    
Short-term debt 44,488 164,046
Weighted average rate 0.50% 0.40%
Japan | Commercial Paper
    
Short-term Debt [Line Items]    
Short-term debt 89,958 146,944
Weighted average rate 0.20% 0.20%
Japan | Notes Payable to Banks
    
Short-term Debt [Line Items]    
Short-term debt   40
Weighted average rate   0.90%
Overseas | Bank Borrowings
    
Short-term Debt [Line Items]    
Short-term debt 164,110 104,542
Weighted average rate 3.20% 3.30%
Overseas | Commercial Paper
    
Short-term Debt [Line Items]    
Short-term debt 11,035 4,560
Weighted average rate 3.90% 3.80%
Overseas | Notes Payable to Banks
    
Short-term Debt [Line Items]    
Short-term debt   ¥ 594
Weighted average rate   4.30%