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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, 2023 | Mar. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 4,933,639 | ¥ 4,743,956
Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 89,530 | 66,376
30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 26,494 | 19,383
90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 63,036 | 46,993
Consumer borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,296,276 | 2,299,307
Consumer borrowers | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 18,225 | 14,621
Consumer borrowers | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 5,350 | 4,574
Consumer borrowers | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 12,875 | 10,047
Consumer borrowers | Consumer - Real Estate Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,042,588 | 2,056,959
Consumer borrowers | Consumer - Real Estate Loans | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,205 | 3,920
Consumer borrowers | Consumer - Real Estate Loans | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,433 | 1,739
Consumer borrowers | Consumer - Real Estate Loans | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,772 | 2,181
Consumer borrowers | Consumer-Card loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 173,142 | 171,635
Consumer borrowers | Consumer-Card loans | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,495 | 1,878
Consumer borrowers | Consumer-Card loans | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 557 | 514
Consumer borrowers | Consumer-Card loans | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,938 | 1,364
Consumer borrowers | Consumer - Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 80,546 | 70,713
Consumer borrowers | Consumer - Other | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 11,525 | 8,823
Consumer borrowers | Consumer - Other | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,360 | 2,321
Consumer borrowers | Consumer - Other | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 8,165 | 6,502
Corporate borrowers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,471,574 | 1,357,086
Corporate borrowers | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 36,602 | 26,991
Corporate borrowers | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 6,183 | 5,628
Corporate borrowers | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 30,419 | 21,363
Corporate borrowers | Non-recourse Loans | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 103,685 | 124,499
Corporate borrowers | Non-recourse Loans | Japan | Past-due financial 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 | 43,350 | 38,654
Corporate borrowers | Non-recourse Loans | The Americas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,661 | 1,494
Corporate borrowers | Non-recourse Loans | 30 To 89 Days Past Due | Japan | Past-due financial assets |  |
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 financial 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 | Japan | Past-due financial 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 financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,661 | 1,494
Corporate borrowers | Real estate companies in Japan | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 320,155 | 296,228
Corporate borrowers | Real estate companies in Japan | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 441 | 378
Corporate borrowers | Real estate companies in Japan | 30 To 89 Days Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 235 | 159
Corporate borrowers | Real estate companies in Japan | 90 Days or More Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 206 | 219
Corporate borrowers | Real estate companies in overseas | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 59,825 | 79,645
Corporate borrowers | Real estate companies in overseas | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 16,260 | 15,030
Corporate borrowers | Real estate companies in overseas | 30 To 89 Days Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,000 | 1,412
Corporate borrowers | Real estate companies in overseas | 90 Days or More Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 15,260 | 13,618
Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 256,094 | 160,530
Corporate borrowers | Commercial, industrial and other companies in Japan | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,570 | 2,484
Corporate borrowers | Commercial, industrial and other companies in Japan | 30 To 89 Days Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,748 | 1,366
Corporate borrowers | Commercial, industrial and other companies in Japan | 90 Days or More Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 822 | 1,118
Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 688,465 | 657,530
Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 15,670 | 7,605
Corporate borrowers | Commercial, industrial and other companies in overseas | 30 To 89 Days Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 3,200 | 2,691
Corporate borrowers | Commercial, industrial and other companies in overseas | 90 Days or More Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 12,470 | 4,914
Net investment in leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 1,165,789 | 1,087,563
Net investment in leases | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 34,703 | 24,764
Net investment in leases | Japan |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 639,433 | 632,120
Net investment in leases | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 7,352 | 7,079
Net investment in leases | Overseas |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 526,356 | 455,443
Net investment in leases | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 27,351 | 17,685
Net investment in leases | 30 To 89 Days Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 14,961 | 9,181
Net investment in leases | 30 To 89 Days Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 2,967 | 2,648
Net investment in leases | 30 To 89 Days Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 11,994 | 6,533
Net investment in leases | 90 Days or More Past Due | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 19,742 | 15,583
Net investment in leases | 90 Days or More Past Due | Japan | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | 4,385 | 4,431
Net investment in leases | 90 Days or More Past Due | Overseas | Past-due financial assets |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total financing receivables | ¥ 15,357 | ¥ 11,152

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