v3.26.1
Insurance contracts in the financial services business - Summary of the Remaining Undiscounted Net Cash Flows (Detail)
¥ in Millions
Mar. 31, 2025
JPY (¥)
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities ¥ 22,740,658
Securities held in the insurance business 20,876,179
Indefinite Term [Member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Securities held in the insurance business 4,372,358
Not later than one year [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 64,000
Securities held in the insurance business 699,185
Later than one year and not later than two years [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 95,151
Securities held in the insurance business 358,761
Later than two years and not later than three years [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 157,008
Securities held in the insurance business 398,222
Later than three years and not later than four years [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 246,745
Securities held in the insurance business 314,310
Later than four years and not later than five years [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 288,630
Securities held in the insurance business 283,300
Later than five years [member]  
Disclosure Of Remaining Undiscounted Cash Flows From Insurance Contracts Liabilities And Marketable Securities And Security Investments [Line Items]  
Insurance contract liabilities and investment contract liabilities 21,889,124
Securities held in the insurance business ¥ 14,450,043