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Investments - Summary of Details of Net Gains and Losses on Equity Securities (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Gain (Loss) on Securities [Line Items]      
Net gains (losses) recognized during the period on equity securities [1] ¥ (557,391) ¥ (155,947) ¥ 289,400
Less: Net gains (losses) recognized during the period on equity securities sold during the period 1,710 34,034  
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting period ¥ (559,101) ¥ (189,981)  
[1] These amounts are revenues from contracts that do not meet the scope of ASC 606.