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Life Insurance Operations (Life Insurance Premiums and Related Investment Income) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Life insurance premiums      
Net Investment Income [Line Items]      
Total revenue ¥ 360,583 ¥ 330,811 ¥ 299,320
Life insurance related investment income      
Net Investment Income [Line Items]      
Total revenue [1] ¥ 7,195 ¥ 16,325 ¥ 52,270
[1] Life insurance related investment income in fiscal 2018 includes a net unrealized holding gain of ¥14,463 million on trading securities held as of March 31, 2018. Life insurance related investment income in fiscal 2019 and 2020 include net unrealized holding losses of ¥217 million and ¥13,122 million on equity securities held as of March 31, 2019 and 2020, respectively.