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Segment Information (Disaggregation of Revenues for Revenues From Contracts With Customers, by Goods and Services Category and Geographical Location) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ 1,299,965 ¥ 1,303,365 ¥ 1,246,098
Other revenues [1] 1,514,396 1,360,294 1,261,945
Segment revenues /Total revenues 2,814,361 2,663,659 2,508,043
Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 266,390 299,901 340,697
Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,524 92,668 94,700
Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 244,508 239,232 244,887
Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 88,325 82,428 76,772
Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 76,087 56,231 32,163
Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 158,075 209,649 156,327
Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 99,843 98,593 100,304
Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 152,022 120,379 92,999
Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,191 104,284 107,249
Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 999,289 1,009,374 975,669
The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,807 106,836 104,747
Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 191,869 187,155 165,682
Operating Segment      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,291,605 1,301,851 1,245,988
Other revenues [1] 1,513,316 1,359,413 1,264,409
Segment revenues /Total revenues 2,804,921 2,661,264 2,510,397
Operating Segment | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 261,403 297,635 339,055
Operating Segment | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,524 92,668 94,701
Operating Segment | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 244,751 239,483 244,943
Operating Segment | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 88,322 82,425 76,755
Operating Segment | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 74,989 55,231 31,421
Operating Segment | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 159,557 211,617 158,255
Operating Segment | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 101,229 100,137 102,689
Operating Segment | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 152,108 120,614 93,265
Operating Segment | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 101,722 102,041 104,904
Operating Segment | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 114,034 111,898 128,385
Other revenues [1] 330,925 317,999 316,943
Segment revenues /Total revenues 444,959 429,897 445,328
Operating Segment | Corporate Financial Services and Maintenance Leasing | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,934 5,356 9,741
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 318 326 347
Operating Segment | Corporate Financial Services and Maintenance Leasing | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 65,942 63,414 62,897
Operating Segment | Corporate Financial Services and Maintenance Leasing | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,958 3,023 2,911
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Corporate Financial Services and Maintenance Leasing | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 40,882 39,779 52,489
Operating Segment | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 403,291 356,997 332,013
Other revenues [1] 68,401 61,739 58,675
Segment revenues /Total revenues 471,692 418,736 390,688
Operating Segment | Real Estate | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,536 3,373 2,521
Operating Segment | Real Estate | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 107,477 92,657 94,617
Operating Segment | Real Estate | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 9,662 7,807 6,107
Operating Segment | Real Estate | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Real Estate | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 74,989 55,231 31,421
Operating Segment | Real Estate | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 41 40 0
Operating Segment | Real Estate | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 101,229 100,137 102,689
Operating Segment | Real Estate | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 104,875 96,509 93,265
Operating Segment | Real Estate | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,482 1,243 1,393
Operating Segment | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 329,772 336,295 349,077
Other revenues [1] 49,396 40,027 36,496
Segment revenues /Total revenues 379,168 376,322 385,573
Operating Segment | PE Investment and Concession | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 249,085 280,361 320,104
Operating Segment | PE Investment and Concession | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 20
Operating Segment | PE Investment and Concession | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 83 84 76
Operating Segment | PE Investment and Concession | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | PE Investment and Concession | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 47,233 24,105 0
Operating Segment | PE Investment and Concession | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 33,371 31,745 28,877
Operating Segment | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 160,612 212,533 159,166
Other revenues [1] 4,986 3,237 1,066
Segment revenues /Total revenues 165,598 215,770 160,232
Operating Segment | Environment and Energy | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,771 4,200 3,861
Operating Segment | Environment and Energy | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (6) 214 93
Operating Segment | Environment and Energy | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 239 248 228
Operating Segment | Environment and Energy | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 155,838 207,037 154,081
Operating Segment | Environment and Energy | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Environment and Energy | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 770 834 903
Operating Segment | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,036 2,626 2,062
Other revenues [1] 561,833 496,861 484,642
Segment revenues /Total revenues 563,869 499,487 486,704
Operating Segment | Insurance | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Insurance | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,036 2,626 2,062
Operating Segment | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,321 7,059 6,427
Other revenues [1] 81,253 77,715 76,292
Segment revenues /Total revenues 88,574 84,774 82,719
Operating Segment | Banking and Credit | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 615 482 326
Operating Segment | Banking and Credit | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Banking and Credit | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 6,706 6,577 6,101
Operating Segment | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 9,478 11,495 7,439
Other revenues [1] 55,713 43,170 32,002
Segment revenues /Total revenues 65,191 54,665 39,441
Operating Segment | Aircraft and Ships | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 97 624 0
Operating Segment | Aircraft and Ships | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 53 66 38
Operating Segment | Aircraft and Ships | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Aircraft and Ships | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 9,328 10,805 7,401
Operating Segment | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 27,135 33,016 27,100
Other revenues [1] 146,291 152,873 126,497
Segment revenues /Total revenues 173,426 185,889 153,597
Operating Segment | ORIX USA | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 555 2,023 2,251
Operating Segment | ORIX USA | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 47 11 84
Operating Segment | ORIX USA | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 20,157 22,900 18,880
Operating Segment | ORIX USA | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 637 1,433 1,187
Operating Segment | ORIX USA | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX USA | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,739 6,649 4,698
Operating Segment | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 214,031 207,829 219,207
Other revenues [1] 13,120 (537) 1,665
Segment revenues /Total revenues 227,151 207,292 220,872
Operating Segment | ORIX Europe | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 213,908 207,679 219,132
Operating Segment | ORIX Europe | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | ORIX Europe | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 123 150 75
Operating Segment | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 23,895 22,103 15,112
Other revenues [1] 201,398 166,329 130,131
Segment revenues /Total revenues 225,293 188,432 145,243
Operating Segment | Asia and Australia | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 425 1,698 577
Operating Segment | Asia and Australia | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 44 9 0
Operating Segment | Asia and Australia | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22,141 18,763 13,630
Operating Segment | Asia and Australia | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Asia and Australia | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,285 1,633 905
Operating Segment | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 990,144 1,006,637 975,450
Operating Segment | Japan | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 114,034 111,898 127,918
Operating Segment | Japan | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 403,291 356,997 332,013
Operating Segment | Japan | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 329,772 336,295 349,077
Operating Segment | Japan | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 129,791 188,196 154,311
Operating Segment | Japan | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,036 2,626 2,062
Operating Segment | Japan | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,321 7,059 6,427
Operating Segment | Japan | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,899 3,566 3,642
Operating Segment | Japan | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Japan | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Japan | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 108,807 106,836 104,747
Operating Segment | The Americas | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | The Americas | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 27,135 33,016 27,100
Operating Segment | The Americas | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 81,672 73,820 77,647
Operating Segment | The Americas | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 192,654 188,378 165,791
Operating Segment | Other Countries | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 467
Operating Segment | Other Countries | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 30,821 24,337 4,855
Operating Segment | Other Countries | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,579 7,929 3,797
Operating Segment | Other Countries | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segment | Other Countries | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 132,359 134,009 141,560
Operating Segment | Other Countries | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 23,895 22,103 15,112
Corporate And Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 8,360 1,514 110
Other revenues [1] 1,080 881 (2,464)
Segment revenues /Total revenues 9,440 2,395 (2,354)
Corporate And Intersegment Eliminations [Member] | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,987 2,266 1,642
Corporate And Intersegment Eliminations [Member] | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 (1)
Corporate And Intersegment Eliminations [Member] | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (243) (251) (56)
Corporate And Intersegment Eliminations [Member] | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3 3 17
Corporate And Intersegment Eliminations [Member] | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,098 1,000 742
Corporate And Intersegment Eliminations [Member] | Environment and energy services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,482) (1,968) (1,928)
Corporate And Intersegment Eliminations [Member] | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,386) (1,544) (2,385)
Corporate And Intersegment Eliminations [Member] | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (86) (235) (266)
Corporate And Intersegment Eliminations [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,469 2,243 2,345
Corporate And Intersegment Eliminations [Member] | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 9,145 2,737 219
Corporate And Intersegment Eliminations [Member] | The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 0 0
Corporate And Intersegment Eliminations [Member] | Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ (785) ¥ (1,223) ¥ (109)
[1] Other revenues include revenues that are not in the scope of revenue from contracts with customers, such as life insurance premiums and related investment income, operating leases, finance revenues that include interest income, and others.