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Retirement and Severance Benefits (Narrative) (Details) (JPY ¥)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2008
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Mar. 31, 2008
Estimated prior service benefit amortized from accumulated other comprehensive income (loss) into net periodic benefit cost for fiscal 2012   ¥ 24,572      
Estimated actuarial loss amortized from accumulated other comprehensive income (loss) into net periodic benefit cost for fiscal 2012   41,814      
Percentage of investments, equity securities   40.00%      
Percentage of investments, debt securities   40.00%      
Percentage of investments, other investments   20.00%      
Expected contribution in fiscal 2012   85,724      
Future benefit payments, 2012   109,528      
Future benefit payments, 2013   110,946      
Future benefit payments, 2014   110,120      
Future benefit payments, 2015   112,717      
Future benefit payments, 2016   113,859      
Future benefit payments, thereafter   595,784      
Net periodic benefit cost 3,727 59,953 76,118 48,900  
Accumulated other comprehensive income (loss)         73,571
Accumulated other comprehensive income (loss),net of tax         44,726
Benefit Obligations [Member]
         
Accumulated benefit obligation   ¥ 2,184,954 ¥ 2,155,066