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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | ¥ 16,866,251 | ¥ 16,322,100 | ¥ 15,289,385
Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 136,227 | 56,444 |
Investments |  | 356,194 | 294,870 |
Maximum exposure to loss | [1] | 622,655 | 474,833 |
Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 37,659,824 | 28,281,876 |
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 132,495 | 52,666 |
Investments |  | 11,224 | 11,773 |
Maximum exposure to loss | [1] | 149,602 | 67,439 |
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 |  | 1,859,420 | 1,196,344 |
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 |  | 272,927 | 223,264 |
Maximum exposure to loss | [1] | 375,942 | 318,007 |
Investment in securities | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 32,105,994 | 23,366,221 |
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 |  | 16,437 | 14,691 |
Maximum exposure to loss | [1] | 16,437 | 14,691 |
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 |  | 760,293 | 1,396,339 |
Power generation projects | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 0 | 0 |
Investments |  | 3,945 | 2,630 |
Maximum exposure to loss | [1] | 5,195 | 4,680 |
Power generation projects | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 19,499 | 14,830 |
Other VIEs | Non Consolidated VIEs [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-recourse loans |  | 3,732 | 3,778 |
Investments |  | 51,661 | 42,512 |
Maximum exposure to loss | [1] | 75,479 | 70,016 |
Other VIEs | Non Consolidated VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | ¥ 2,914,618 | ¥ 2,308,142 |
[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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