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Combined and Condensed Information Related to Affiliates (Detail)
In Millions
12 Months Ended
Mar. 31, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Mar. 31, 2010
JPY (¥)
Mar. 31, 2009
JPY (¥)
Schedule of Equity Method Investments [Line Items]        
Total revenues $ 10,234 ¥ 850,947 ¥ 1,093,173 ¥ 1,393,480
Income before income taxes 1,301 108,175 139,067 (64,530)
Net income 1,116 92,763 89,368 (77,415)
Total assets 50,963 4,237,580 3,983,524 4,390,084
Total liabilities 38,175 3,174,222 2,968,953 3,435,107
Total equity $ 12,788 ¥ 1,063,358 ¥ 1,014,571 ¥ 954,977