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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 | Mar. 31, 2024 | Mar. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 4,947,258 | ¥ 4,771,491
Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 90,868 | 66,376
30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 39,946 | 19,383
90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 50,922 | 46,993
Consumer borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,070,449 | 2,299,307
Consumer borrowers | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 8,452 | 14,621
Consumer borrowers | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,994 | 4,574
Consumer borrowers | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,458 | 10,047
Consumer borrowers | Real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,947,461 | 2,056,959
Consumer borrowers | Real estate loans | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,242 | 3,920
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 | 2,064 | 1,739
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 | 2,178 | 2,181
Consumer borrowers | Card loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 72,353 | 171,635
Consumer borrowers | Card loans | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 1,878
Consumer borrowers | Card loans | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 514
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 | 1,364
Consumer borrowers | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 50,635 | 70,713
Consumer borrowers | Other | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,210 | 8,823
Consumer borrowers | Other | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,930 | 2,321
Consumer borrowers | Other | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,280 | 6,502
Corporate borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,469,857 | 1,357,086
Corporate borrowers | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 40,045 | 26,991
Corporate borrowers | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 12,576 | 5,628
Corporate borrowers | 90 days or more past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 27,469 | 21,363
Corporate borrowers | Non-recourse Loans | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 145,286 | 124,499
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 | 50,263 | 38,654
Corporate borrowers | Non-recourse Loans | The Americas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,628 | 1,494
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 | 2,502 | 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 | 1,126 | 1,494
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 334,506 | 296,228
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 | 228 | 378
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 59,759 | 79,645
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 | 18,699 | 15,030
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 | 113 | 159
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 | 1,080 | 1,412
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 | 115 | 219
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 | 17,619 | 13,618
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 180,896 | 160,530
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 | 2,021 | 2,484
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 699,147 | 657,530
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 | 15,469 | 7,605
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 | 1,666 | 1,366
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 | 7,215 | 2,691
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 | 355 | 1,118
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 | 8,254 | 4,914
Loans to Equity Method Investees |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 251,929 | 27,535
Loans to Equity Method Investees | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 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 | 0 | 0
Net investment in leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,155,023 | 1,087,563
Net investment in leases | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 42,371 | 24,764
Net investment in leases | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 624,094 | 632,120
Net investment in leases | Japan | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,897 | 7,079
Net investment in leases | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 530,929 | 455,443
Net investment in leases | Overseas | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 35,474 | 17,685
Net investment in leases | 30-89 days past-due | Past-due financing assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 23,376 | 9,181
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 | 2,525 | 2,648
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 | 20,851 | 6,533
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 | 18,995 | 15,583
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 | 4,372 | 4,431
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 | ¥ 14,623 | ¥ 11,152

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