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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, 2023 | Mar. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 4,743,956 | ¥ 4,744,682
Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 66,376 | 89,663
30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 19,383 | 34,345
90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 46,993 | 55,318
Consumer borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,299,307 | 2,343,030
Consumer borrowers | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 14,621 | 9,820
Consumer borrowers | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,574 | 4,183
Consumer borrowers | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 10,047 | 5,637
Consumer borrowers | Consumer - Real Estate Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,056,959 | 2,113,430
Consumer borrowers | Consumer - Real Estate Loans | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,920 | 3,735
Consumer borrowers | Consumer - Real Estate Loans | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,739 | 1,473
Consumer borrowers | Consumer - Real Estate Loans | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,181 | 2,262
Consumer borrowers | Consumer-Card loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 171,635 | 173,687
Consumer borrowers | Consumer-Card loans | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,878 | 874
Consumer borrowers | Consumer-Card loans | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 514 | 371
Consumer borrowers | Consumer-Card loans | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,364 | 503
Consumer borrowers | Consumer - Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 70,713 | 55,913
Consumer borrowers | Consumer - Other | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 8,823 | 5,211
Consumer borrowers | Consumer - Other | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,321 | 2,339
Consumer borrowers | Consumer - Other | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,502 | 2,872
Corporate borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,357,086 | 1,343,679
Corporate borrowers | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 26,991 | 52,775
Corporate borrowers | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 5,628 | 20,840
Corporate borrowers | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 21,363 | 31,935
Corporate borrowers | Non-recourse Loans | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 124,499 | 74,085
Corporate borrowers | Non-recourse Loans | Japan | Past-due financing assets [Member] |  |
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 | 38,654 | 80,918
Corporate borrowers | Non-recourse Loans | The Americas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,494 | 3,556
Corporate borrowers | Non-recourse Loans | 30 To 89 Days Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 0
Corporate borrowers | Non-recourse Loans | 30 To 89 Days Past Due | The Americas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 0 | 514
Corporate borrowers | Non-recourse Loans | 90 Days or More Past Due | Japan | Past-due financing assets [Member] |  |
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 [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,494 | 3,042
Corporate borrowers | Real estate companies in Japan | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 296,228 | 278,607
Corporate borrowers | Real estate companies in Japan | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 378 | 928
Corporate borrowers | Real estate companies in Japan | 30 To 89 Days Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 159 | 578
Corporate borrowers | Real estate companies in Japan | 90 Days or More Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 219 | 350
Corporate borrowers | Real estate companies in overseas | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 79,645 | 121,851
Corporate borrowers | Real estate companies in overseas | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 15,030 | 36,992
Corporate borrowers | Real estate companies in overseas | 30 To 89 Days Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,412 | 16,113
Corporate borrowers | Real estate companies in overseas | 90 Days or More Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 13,618 | 20,879
Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 160,530 | 164,132
Corporate borrowers | Commercial, industrial and other companies in Japan | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,484 | 2,511
Corporate borrowers | Commercial, industrial and other companies in Japan | 30 To 89 Days Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,366 | 1,243
Corporate borrowers | Commercial, industrial and other companies in Japan | 90 Days or More Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,118 | 1,268
Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 657,530 | 624,086
Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 7,605 | 8,788
Corporate borrowers | Commercial, industrial and other companies in overseas | 30 To 89 Days Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,691 | 2,392
Corporate borrowers | Commercial, industrial and other companies in overseas | 90 Days or More Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,914 | 6,396
Net investment in leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,087,563 | 1,057,973
Net investment in leases | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 24,764 | 27,068
Net investment in leases | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 632,120 | 652,455
Net investment in leases | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 7,079 | 8,034
Net investment in leases | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 455,443 | 405,518
Net investment in leases | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 17,685 | 19,034
Net investment in leases | 30 To 89 Days Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 9,181 | 9,322
Net investment in leases | 30 To 89 Days Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,648 | 2,252
Net investment in leases | 30 To 89 Days Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,533 | 7,070
Net investment in leases | 90 Days or More Past Due | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 15,583 | 17,746
Net investment in leases | 90 Days or More Past Due | Japan | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,431 | 5,782
Net investment in leases | 90 Days or More Past Due | Overseas | Past-due financing assets [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 11,152 | ¥ 11,964

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