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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Past-Due Financial Assets (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 5,296,674 | ¥ 5,105,469
Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 152,141 | 146,652
30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 32,653 | 34,490
90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 119,488 | 112,162
Consumer borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,108,053 | 2,067,900
Consumer borrowers | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 11,599 | 12,126
Consumer borrowers | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,541 | 4,481
Consumer borrowers | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 9,058 | 7,645
Consumer borrowers | Real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,001,575 | 1,956,816
Consumer borrowers | Real estate loans | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 7,619 | 7,959
Consumer borrowers | Real estate loans | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 752 | 2,536
Consumer borrowers | Real estate loans | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,867 | 5,423
Consumer borrowers | Card loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 65,759 | 67,874
Consumer borrowers | Card loans | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 395 | 355
Consumer borrowers | Card loans | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 395 | 355
Consumer borrowers | Card loans | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Consumer borrowers | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 40,719 | 43,210
Consumer borrowers | Other | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,585 | 3,812
Consumer borrowers | Other | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,394 | 1,590
Consumer borrowers | Other | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,191 | 2,222
Corporate borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,850,367 | 1,738,136
Corporate borrowers | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 99,821 | 93,836
Corporate borrowers | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 7,676 | 9,896
Corporate borrowers | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 92,145 | 83,940
Corporate borrowers | Non-recourse Loans | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 338,230 | 301,477
Corporate borrowers | Non-recourse Loans | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Corporate borrowers | Non-recourse Loans | The Americas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables |  | 86,724
Corporate borrowers | Non-recourse Loans | The Americas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables |  | 5,837
Corporate borrowers | Non-recourse Loans | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 151,269 |
Corporate borrowers | Non-recourse Loans | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,691 |
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | The Americas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables |  | 2,141
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 |
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | The Americas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables |  | 3,696
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,691 |
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 447,544 | 415,666
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 317 | 229
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 155,813 | 131,042
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 72,318 | 51,310
Corporate borrowers | Other than non-recourse loans | Real estate companies | 30-89 days past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 285 | 200
Corporate borrowers | Other than non-recourse loans | Real estate companies | 30-89 days past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 78 | 36
Corporate borrowers | Other than non-recourse loans | Real estate companies | 90 days or more past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 32 | 29
Corporate borrowers | Other than non-recourse loans | Real estate companies | 90 days or more past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 72,240 | 51,274
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 215,988 | 225,900
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,925 | 2,512
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 541,523 | 577,327
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 19,570 | 33,948
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 30-89 days past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,374 | 1,992
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 30-89 days past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,939 | 5,527
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 90 days or more past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 551 | 520
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 90 days or more past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 14,631 | 28,421
Loans to Equity Method Investees |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 137,585 | 132,053
Loans to Equity Method Investees | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4 | 0
Loans to Equity Method Investees | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Loans to Equity Method Investees | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4 | 0
Net investment in leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,200,669 | 1,167,380
Net investment in leases | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 40,717 | 40,690
Net investment in leases | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 615,211 | 618,963
Net investment in leases | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,389 | 7,766
Net investment in leases | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 585,458 | 548,417
Net investment in leases | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 34,328 | 32,924
Net investment in leases | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 22,436 | 20,113
Net investment in leases | 30-89 days past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,452 | 3,851
Net investment in leases | 30-89 days past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 19,984 | 16,262
Net investment in leases | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 18,281 | 20,577
Net investment in leases | 90 days or more past-due | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,937 | 3,915
Net investment in leases | 90 days or more past-due | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 14,344 | ¥ 16,662

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