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Income Taxes (Total Income Tax Recognized) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]      
Provision for income taxes ¥ 105,837 ¥ 68,691 ¥ 113,912
Income taxes allocated to other comprehensive income (loss):      
Net change of unrealized gains (losses) on investment in securities (7,016) 4,013 (11,084)
Net change of debt valuation adjustments 340 90 0
Net change of defined benefit pension plans 448 (2,864) (911)
Net change of foreign currency translation adjustments 10,276 729 (1,517)
Net change of unrealized gains (losses) on derivative instruments (2,163) (1,258) 139
Direct adjustments to shareholders' equity 0 0 (2)
Total income taxes ¥ 107,722 ¥ 69,401 ¥ 100,537