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Notional Amounts of Derivative Instruments and Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Derivatives designated as hedging instruments and other | Interest rate swap agreements
   
Derivatives, Fair Value [Line Items]    
Notional amount ¥ 235,398 ¥ 276,132
Derivatives designated as hedging instruments and other | Interest rate swap agreements | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 4,625 2,070
Derivatives designated as hedging instruments and other | Interest rate swap agreements | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 1,404 1,273
Derivatives designated as hedging instruments and other | Futures, Foreign exchange contracts
   
Derivatives, Fair Value [Line Items]    
Notional amount 144,864 163,342
Derivatives designated as hedging instruments and other | Futures, Foreign exchange contracts | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 1,509 1,075
Derivatives designated as hedging instruments and other | Futures, Foreign exchange contracts | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 1,180 3,509
Derivatives designated as hedging instruments and other | Foreign currency swap agreements
   
Derivatives, Fair Value [Line Items]    
Notional amount 90,323 179,429
Derivatives designated as hedging instruments and other | Foreign currency swap agreements | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 8,671 13,072
Derivatives designated as hedging instruments and other | Foreign currency swap agreements | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 3,687 31,830
Derivatives designated as hedging instruments and other | Foreign currency long-term-debt
   
Derivatives, Fair Value [Line Items]    
Notional amount 96,221 116,695
Trading derivatives or derivatives not designated as hedging instruments | Interest rate swap agreements
   
Derivatives, Fair Value [Line Items]    
Notional amount 1,338 3,129
Trading derivatives or derivatives not designated as hedging instruments | Interest rate swap agreements | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 29 47
Trading derivatives or derivatives not designated as hedging instruments | Futures, Foreign exchange contracts
   
Derivatives, Fair Value [Line Items]    
Notional amount 206,075 227,640
Trading derivatives or derivatives not designated as hedging instruments | Futures, Foreign exchange contracts | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 598 1,558
Trading derivatives or derivatives not designated as hedging instruments | Futures, Foreign exchange contracts | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 613 1,459
Trading derivatives or derivatives not designated as hedging instruments | Foreign currency swap agreements
   
Derivatives, Fair Value [Line Items]    
Notional amount   10,073
Trading derivatives or derivatives not designated as hedging instruments | Foreign currency swap agreements | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value   1,694
Trading derivatives or derivatives not designated as hedging instruments | Foreign currency swap agreements | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value   1,651
Trading derivatives or derivatives not designated as hedging instruments | Options held/written, caps held and other
   
Derivatives, Fair Value [Line Items]    
Notional amount 113,160 124,034
Trading derivatives or derivatives not designated as hedging instruments | Options held/written, caps held and other | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 4,101 3,467
Trading derivatives or derivatives not designated as hedging instruments | Options held/written, caps held and other | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value 2,678 2,071
Trading derivatives or derivatives not designated as hedging instruments | Credit derivatives held/written
   
Derivatives, Fair Value [Line Items]    
Notional amount 5,829 36,027
Trading derivatives or derivatives not designated as hedging instruments | Credit derivatives held/written | Other Receivables
   
Derivatives, Fair Value [Line Items]    
Asset derivatives Fair value 162 49
Trading derivatives or derivatives not designated as hedging instruments | Credit derivatives held/written | Trade notes, accounts payable and other liabilities
   
Derivatives, Fair Value [Line Items]    
Liability derivatives Fair value ¥ 4 ¥ 236