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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Origination Years of Financial Assets (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2023 | Mar. 31, 2022
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Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | ¥ 4,743,956 | ¥ 4,744,682
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 1,171,744 | 1,153,072
One year ago |  | 804,937 | 754,895
Two years ago |  | 551,251 | 862,432
Three years ago |  | 636,069 | 554,762
Four years ago |  | 450,935 | 378,732
Prior |  | 903,567 | 815,806
Total financing receivables |  | 4,518,503 | 4,519,699
Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 13,910 | 11,302
One year ago |  | 9,578 | 10,678
Two years ago |  | 10,431 | 11,522
Three years ago |  | 9,258 | 9,632
Four years ago |  | 7,790 | 19,287
Prior |  | 42,641 | 39,678
Total financing receivables |  | 93,608 | 102,099
Consumer borrowers |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 2,299,307 | 2,343,030
Consumer borrowers | Consumer - Real Estate Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 2,056,959 | 2,113,430
Consumer borrowers | Other loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 70,713 | 55,913
Consumer borrowers | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 300,198 | 322,924
One year ago |  | 200,041 | 314,935
Two years ago |  | 281,872 | 387,988
Three years ago |  | 360,726 | 314,163
Four years ago |  | 293,297 | 202,309
Prior |  | 656,584 | 595,321
Total financing receivables |  | 2,092,718 | 2,137,640
Consumer borrowers | Performing | Consumer - Real Estate Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 266,663 | 302,695
One year ago |  | 190,076 | 309,893
Two years ago |  | 279,690 | 382,612
Three years ago |  | 359,321 | 311,959
Four years ago |  | 292,388 | 198,974
Prior |  | 655,811 | 594,612
Total financing receivables |  | 2,043,949 | 2,100,745
Consumer borrowers | Performing | Other loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year | [1] | 33,535 | 20,229
One year ago | [1] | 9,965 | 5,042
Two years ago | [1] | 2,182 | 5,376
Three years ago | [1] | 1,405 | 2,204
Four years ago | [1] | 909 | 3,335
Prior | [1] | 773 | 709
Total financing receivables | [1] | 48,769 | 36,895
Consumer borrowers | Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 10,896 | 8,282
One year ago |  | 5,259 | 4,595
Two years ago |  | 3,140 | 3,852
Three years ago |  | 2,257 | 2,098
Four years ago |  | 1,078 | 961
Prior |  | 12,324 | 11,915
Total financing receivables |  | 34,954 | 31,703
Consumer borrowers | Non-Performing | Consumer - Real Estate Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 17 | 26
One year ago |  | 81 | 94
Two years ago |  | 378 | 489
Three years ago |  | 474 | 380
Four years ago |  | 239 | 222
Prior |  | 11,821 | 11,474
Total financing receivables |  | 13,010 | 12,685
Consumer borrowers | Non-Performing | Other loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year | [1] | 10,879 | 8,256
One year ago | [1] | 5,178 | 4,501
Two years ago | [1] | 2,762 | 3,363
Three years ago | [1] | 1,783 | 1,718
Four years ago | [1] | 839 | 739
Prior | [1] | 503 | 441
Total financing receivables | [1] | 21,944 | 19,018
Corporate borrowers |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 1,357,086 | 1,343,679
Corporate borrowers | Non-recourse Loans | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 124,499 | 74,085
Corporate borrowers | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 38,654 | 80,918
Corporate borrowers | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 296,228 | 278,607
Corporate borrowers | Real estate companies in overseas | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 79,645 | 121,851
Corporate borrowers | Commercial Industrial And Other Companies In Japan [Member] | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 160,530 | 164,132
Corporate borrowers | Commercial Industrial And Other Companies In Overseas [Member] | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 657,530 | 624,086
Corporate borrowers | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 427,902 | 487,433
One year ago |  | 346,629 | 188,634
Two years ago |  | 127,984 | 283,950
Three years ago |  | 171,314 | 127,128
Four years ago |  | 103,628 | 96,851
Prior |  | 139,503 | 111,640
Total financing receivables |  | 1,316,960 | 1,295,636
Corporate borrowers | Performing | Non-recourse Loans | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 65,874 | 26,991
One year ago |  | 17,831 | 6,686
Two years ago |  | 6,699 | 24,244
Three years ago |  | 22,384 | 5,256
Four years ago |  | 4,158 | 2,750
Prior |  | 7,553 | 8,158
Total financing receivables |  | 124,499 | 74,085
Corporate borrowers | Performing | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 2,901 | 0
One year ago |  | 706 | 5,547
Two years ago |  | 5,217 | 51,467
Three years ago |  | 15,153 | 11,744
Four years ago |  | 10,595 | 7,721
Prior |  | 834 | 1,397
Total financing receivables |  | 35,406 | 77,876
Corporate borrowers | Performing | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 124,452 | 102,719
One year ago |  | 43,210 | 48,420
Two years ago |  | 30,996 | 37,845
Three years ago |  | 27,022 | 28,727
Four years ago |  | 22,251 | 24,481
Prior |  | 46,222 | 34,111
Total financing receivables |  | 294,153 | 276,303
Corporate borrowers | Performing | Real estate companies in overseas | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 34,508 | 24,104
One year ago |  | 12,639 | 26,751
Two years ago |  | 9,091 | 41,644
Three years ago |  | 6,998 | 2,256
Four years ago |  | 1,627 | 5,478
Prior |  | 1,165 | 740
Total financing receivables |  | 66,028 | 100,973
Corporate borrowers | Performing | Commercial Industrial And Other Companies In Japan [Member] | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 76,764 | 75,273
One year ago |  | 27,327 | 24,808
Two years ago |  | 16,743 | 26,748
Three years ago |  | 17,003 | 13,746
Four years ago |  | 8,383 | 6,457
Prior |  | 12,878 | 13,806
Total financing receivables |  | 159,098 | 160,838
Corporate borrowers | Performing | Commercial Industrial And Other Companies In Overseas [Member] | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 123,403 | 258,346
One year ago |  | 244,916 | 76,422
Two years ago |  | 59,238 | 102,002
Three years ago |  | 82,754 | 65,399
Four years ago |  | 56,614 | 49,964
Prior |  | 70,851 | 53,428
Total financing receivables |  | 637,776 | 605,561
Corporate borrowers | Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 257 | 412
One year ago |  | 793 | 3,184
Two years ago |  | 5,485 | 4,138
Three years ago |  | 4,959 | 4,747
Four years ago |  | 4,624 | 14,562
Prior |  | 24,008 | 21,000
Total financing receivables |  | 40,126 | 48,043
Corporate borrowers | Non-Performing | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 0 | 0
One year ago |  | 0 | 64
Two years ago |  | 0 | 0
Three years ago |  | 0 | 1,587
Four years ago |  | 0 | 0
Prior |  | 3,248 | 1,391
Total financing receivables |  | 3,248 | 3,042
Corporate borrowers | Non-Performing | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 0 | 0
One year ago |  | 230 | 245
Two years ago |  | 0 | 938
Three years ago |  | 913 | 71
Four years ago |  | 9 | 0
Prior |  | 923 | 1,050
Total financing receivables |  | 2,075 | 2,304
Corporate borrowers | Non-Performing | Real estate companies in overseas | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 0 | 0
One year ago |  | 0 | 0
Two years ago |  | 741 | 0
Three years ago |  | 0 | 371
Four years ago |  | 813 | 12,790
Prior |  | 12,063 | 7,717
Total financing receivables |  | 13,617 | 20,878
Corporate borrowers | Non-Performing | Commercial Industrial And Other Companies In Japan [Member] | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 125 | 156
One year ago |  | 80 | 457
Two years ago |  | 431 | 1,392
Three years ago |  | 264 | 124
Four years ago |  | 133 | 392
Prior |  | 399 | 773
Total financing receivables |  | 1,432 | 3,294
Corporate borrowers | Non-Performing | Commercial Industrial And Other Companies In Overseas [Member] | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 132 | 256
One year ago |  | 483 | 2,418
Two years ago |  | 4,313 | 1,808
Three years ago |  | 3,782 | 2,594
Four years ago |  | 3,669 | 1,380
Prior |  | 7,375 | 10,069
Total financing receivables |  | 19,754 | 18,525
Purchased loans | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 26 | 0
One year ago |  | 396 | 0
Two years ago |  | 0 | 24
Three years ago |  | 21 | 281
Four years ago |  | 406 | 1,072
Prior |  | 10,385 | 10,885
Total financing receivables |  | 11,234 | 12,262
Purchased loans | Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 0 | 0
One year ago |  | 0 | 0
Two years ago |  | 0 | 0
Three years ago |  | 0 | 0
Four years ago |  | 0 | 0
Prior |  | 1,021 | 1,485
Total financing receivables |  | 1,021 | 1,485
Net investment in leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 1,087,563 | 1,057,973
Net investment in leases | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 632,120 | 652,455
Net investment in leases | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total financing receivables |  | 455,443 | 405,518
Net investment in leases | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 440,421 | 328,428
One year ago |  | 257,871 | 249,106
Two years ago |  | 139,306 | 190,125
Three years ago |  | 103,726 | 113,190
Four years ago |  | 53,604 | 77,683
Prior |  | 75,794 | 80,217
Total financing receivables |  | 1,070,722 | 1,038,749
Net investment in leases | Performing | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 193,297 | 119,538
One year ago |  | 136,285 | 154,757
Two years ago |  | 99,739 | 133,589
Three years ago |  | 80,542 | 91,691
Four years ago |  | 44,853 | 68,087
Prior |  | 72,295 | 78,283
Total financing receivables |  | 627,011 | 645,945
Net investment in leases | Performing | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 247,124 | 208,890
One year ago |  | 121,586 | 94,349
Two years ago |  | 39,567 | 56,536
Three years ago |  | 23,184 | 21,499
Four years ago |  | 8,751 | 9,596
Prior |  | 3,499 | 1,934
Total financing receivables |  | 443,711 | 392,804
Net investment in leases | Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 2,757 | 2,608
One year ago |  | 3,228 | 2,899
Two years ago |  | 1,806 | 3,474
Three years ago |  | 2,042 | 2,787
Four years ago |  | 1,720 | 2,178
Prior |  | 5,288 | 5,278
Total financing receivables |  | 16,841 | 19,224
Net investment in leases | Non-Performing | Japan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 212 | 402
One year ago |  | 660 | 605
Two years ago |  | 658 | 1,044
Three years ago |  | 798 | 1,103
Four years ago |  | 811 | 1,247
Prior |  | 1,970 | 2,109
Total financing receivables |  | 5,109 | 6,510
Net investment in leases | Non-Performing | Overseas |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 2,545 | 2,206
One year ago |  | 2,568 | 2,294
Two years ago |  | 1,148 | 2,430
Three years ago |  | 1,244 | 1,684
Four years ago |  | 909 | 931
Prior |  | 3,318 | 3,169
Total financing receivables |  | 11,732 | 12,714
Other financial assets measured at amortized cost | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 3,197 | 14,287
One year ago |  | 0 | 2,220
Two years ago |  | 2,089 | 345
Three years ago |  | 282 | 0
Four years ago |  | 0 | 817
Prior |  | 21,301 | 17,743
Total financing receivables |  | 26,869 | 35,412
Other financial assets measured at amortized cost | Non-Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current fiscal year |  | 0 | 0
One year ago |  | 298 | 0
Two years ago |  | 0 | 58
Three years ago |  | 0 | 0
Four years ago |  | 368 | 1,586
Prior |  | 0 | 0
Total financing receivables |  | ¥ 666 | ¥ 1,644
[1] | Other in loans to consumer borrowers includes claims receivable arising from payments on guarantee of consumer loans. For further information, see Note 30 “Commitments, Guarantees and Contingent Liabilities.”

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