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Variable Interest Entities (Information about Non-consolidated VIEs) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets |  | ¥ 15,795,220 | ¥ 15,289,385
Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 21,934 | 14,054
Investments |  | 276,078 | 151,539
Maximum exposure to loss | [1] | 409,830 | 253,202
Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 19,264,663 | 14,188,544
Liquidating customer assets | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 991 | 991
Maximum exposure to loss | [1] | 991 | 991
Liquidating customer assets | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 8,225 | 8,247
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 18,201 | 10,721
Investments |  | 9,434 | 8,805
Maximum exposure to loss | [1] | 28,765 | 20,526
Acquisition of real estate and real estate development projects for customers | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 890,013 | 648,468
Acquisition of real estate for the Company and its subsidiaries' real estate-related business | Non Consolidated VIEs |  |  |
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 | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Corporate rehabilitation support business | Non Consolidated VIEs |  |  |
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 | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Investment in securities | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 217,074 | 98,742
Maximum exposure to loss | [1] | 309,082 | 173,314
Investment in securities | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 15,008,420 | 10,887,430
Securitizing financial assets such as finance lease receivable and loan receivable | Non Consolidated VIEs |  |  |
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 | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Securitization of loan receivable originated by third parties | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 10,958 | 10,475
Maximum exposure to loss | [1] | 10,958 | 10,475
Securitization of loan receivable originated by third parties | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 1,225,527 | 901,544
Power generation projects | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 0 | 0
Investments |  | 2,436 | 3,691
Maximum exposure to loss | [1] | 4,486 | 4,491
Power generation projects | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 15,872 | 16,138
Other VIEs | Non Consolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse loans |  | 3,733 | 3,333
Investments |  | 35,185 | 28,835
Maximum exposure to loss | [1] | 55,548 | 43,405
Other VIEs | Non Consolidated VIEs | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | ¥ 2,116,606 | ¥ 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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