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Income and Expenses Relating to Life Insurance Operations - Life Insurance Premiums and Related Investment Income (Detail) - JPY (¥)
¥ in Millions

3 Months Ended

6 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Net Investment Income [Line Items]

Total revenue

¥ 682,761

¥ 707,003

¥ 1,359,735

¥ 1,364,816

Life insurance premiums

Net Investment Income [Line Items]

Total revenue

117,474

117,752

222,783

220,762

Life insurance related investment income

Net Investment Income [Line Items]

Total revenue

15,746

^[1]

19,182

^[1]

62,955

^[2]

42,449

^[2]

Life insurance premiums and related investment income

Net Investment Income [Line Items]

Total revenue

¥ 133,220

¥ 136,934

¥ 285,738

¥ 263,211

[1]	Life insurance related investment income for the three months ended September 30, 2022 and 2023 include net unrealized holding a loss of ¥1,222 million and a gain of ¥55 million on equity securities held as of September 30, 2022 and 2023, respectively.
[2]	Life insurance related investment income for the six months ended September 30, 2022 and 2023 include net unrealized holding a loss of ¥9,465 million and a gain of ¥18,115 million on equity securities held as of September 30, 2022 and 2023, respectively.

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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