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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | ¥ 16,322,100 | ¥ 15,289,385 | ¥ 14,280,684
Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 56,444 | 14,054 |
Investments |  | 294,870 | 151,539 |
Maximum exposure to loss | [1] | 474,833 | 253,202 |
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 28,281,876 | 14,188,544 |
Liquidating customer assets | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 0 | 991 |
Maximum exposure to loss | [1] | 0 | 991 |
Liquidating customer assets | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 0 | 8,247 |
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 52,666 | 10,721 |
Investments |  | 11,773 | 8,805 |
Maximum exposure to loss | [1] | 67,439 | 20,526 |
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 1,196,344 | 648,468 |
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 0 | 0 |
Maximum exposure to loss | [1] | 0 | 0 |
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 0 | 0 |
Corporate rehabilitation support business | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 0 | 0 |
Maximum exposure to loss | [1] | 0 | 0 |
Corporate rehabilitation support business | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 0 | 0 |
Investment in securities | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 223,264 | 98,742 |
Maximum exposure to loss | [1] | 318,007 | 173,314 |
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 23,366,221 | 10,887,430 |
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 0 | 0 |
Maximum exposure to loss | [1] | 0 | 0 |
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 0 | 0 |
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 14,691 | 10,475 |
Maximum exposure to loss | [1] | 14,691 | 10,475 |
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 1,396,339 | 901,544 |
Power generation projects | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 2,630 | 3,691 |
Maximum exposure to loss | [1] | 4,680 | 4,491 |
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 14,830 | 16,138 |
Other VIEs | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 3,778 | 3,333 |
Investments |  | 42,512 | 28,835 |
Maximum exposure to loss | [1] | 70,016 | 43,405 |
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | ¥ 2,308,142 | ¥ 1,726,717 |
[1] | Maximum exposure to loss includes remaining balance of commitments that could require the Company and its subsidiaries to provide investments or loans to the VIE.

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