v3.26.1
Structured entities - Summary of Unconsolidated Structured Entities (Detail)
¥ in Millions
Mar. 31, 2025
JPY (¥)
Disclosure of unconsolidated structured entities [line items]  
Maximum exposure to loss ¥ 1,424,083
Investments And Advances In The Financial Services Segment Current [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 22,071
Investments And Advances In The Financial Services Segment Noncurrent [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 1,358,517
Other Current Financial Assets [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 21,429
Securitized Products [Member]  
Disclosure of unconsolidated structured entities [line items]  
Maximum exposure to loss 547,861
Securitized Products [Member] | Investments And Advances In The Financial Services Segment Noncurrent [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 547,861
Foreign Corporate Bonds [Member]  
Disclosure of unconsolidated structured entities [line items]  
Maximum exposure to loss 242,006 [1]
Foreign Corporate Bonds [Member] | Investments And Advances In The Financial Services Segment Current [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 22,071 [1]
Foreign Corporate Bonds [Member] | Investments And Advances In The Financial Services Segment Noncurrent [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 219,935 [1]
Investment funds [member]  
Disclosure of unconsolidated structured entities [line items]  
Maximum exposure to loss 634,216 [2]
Investment funds [member] | Investments And Advances In The Financial Services Segment Noncurrent [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities 590,721 [2]
Investment funds [member] | Other Current Financial Assets [Member]  
Disclosure of unconsolidated structured entities [line items]  
Assets recognised in entity's financial statements in relation to structured entities ¥ 21,429 [2]
[1] Foreign corporate bonds primarily include repackaged bonds.
[2] Other investments primarily include investment funds.