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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets |  | ¥ 17,604,283 | ¥ 16,866,251
Non Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 172,225 | 136,227
Investments |  | 421,635 | 356,194
Maximum exposure to loss | [1] | 730,945 | 622,655
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 43,531,800 | 37,659,824
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 172,225 | 132,495
Investments |  | 11,982 | 11,224
Maximum exposure to loss | [1] | 196,850 | 149,602
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 |  | 2,080,617 | 1,859,420
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 |  | 317,948 | 272,927
Maximum exposure to loss | [1] | 425,015 | 375,942
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 37,045,631 | 32,105,994
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 |  | 2,850 | 0
Maximum exposure to loss | [1] | 2,850 | 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 |  | 5,262 | 0
Securitization of loan receivable originated by third parties | Non Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 15,992 | 16,437
Maximum exposure to loss | [1] | 15,992 | 16,437
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 |  | 652,360 | 760,293
Power generation projects | Non Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 5,467 | 3,945
Maximum exposure to loss | [1] | 5,467 | 5,195
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 23,946 | 19,499
Other VIEs | Non Consolidated VIEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 3,732
Investments |  | 67,396 | 51,661
Maximum exposure to loss | [1] | 84,771 | 75,479
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | ¥ 3,723,984 | ¥ 2,914,618
[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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