First-time adoption - Summary of Impact on Insurance Related Accounts Before Considering Tax Effect Due to First Time Adoptiopn of IFRS (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2022	Mar. 31, 2021	Apr. 01, 2020
Impact On Insurance Related Accounts Before Considering Tax Effect Due To First Time Adoption Of IFRS [Line Items]
Deferred insurance acquisition costs	¥ 676,526	¥ 623,986	¥ 187,904
Future insurance policy benefits and other	(7,039,034)	(6,614,585)	(6,519,577)
Policyholders' account in the life insurance business	(4,791,295)	(4,328,894)	(3,640,010)
Accumulated other comprehensive income	¥ (1,222,332)	(1,520,257)	(979,476)
Adjustment to Recognition And Measurement Differences [Member]
Impact On Insurance Related Accounts Before Considering Tax Effect Due To First Time Adoption Of IFRS [Line Items]
Deferred insurance acquisition costs		(33,434)	(412,997)
Future insurance policy benefits and other		(14,608)	(273,530)
Policyholders' account in the life insurance business		2,171	2,261
Accumulated other comprehensive income		(2,044,277)	(1,560,456)
Adjustment to Recognition And Measurement Differences [Member] \| Impact Of Change in Insurance Related Accounts Before Considering Tax Effect [Member]
Impact On Insurance Related Accounts Before Considering Tax Effect Due To First Time Adoption Of IFRS [Line Items]
Deferred insurance acquisition costs		(33,434)	(412,997)
Future insurance policy benefits and other		(14,609)	(273,530)
Policyholders' account in the life insurance business		2,170	2,261
Accumulated other comprehensive income		¥ 45,873	¥ 684,266

The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income]

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The amount of costs that an insurer incurs to sell, underwrite and initiate a new insurance contract whose recognition as an expense has been deferred. [Refer: Types of insurance contracts [member]]

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Future insurance policy benefits and other non current.

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