v3.25.2
Insurance contracts in the financial services segment - Summary of cash flows of insurance contracts for major currencies (Detail)
Mar. 31, 2025
Mar. 31, 2024
1 year [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 0.65% 0.06%
1 year [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.09% 5.11%
5 years [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 1.13% 0.38%
5 years [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.01% 4.25%
10 years [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 1.54% 0.77%
10 years [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.31% 4.25%
20 years [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 2.34% 1.58%
20 years [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.83% 4.63%
30 years [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 2.69% 1.95%
30 years [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.68% 4.37%
40 years [member] | JPY [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 3.02% 2.14%
40 years [member] | USD [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield used to discount cash flows that do not vary based on returns on underlying items 4.29% 4.07%