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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]      
Revenues from contracts with customers ¥ 1,303,365 ¥ 1,246,098 ¥ 1,087,555
Other revenues [1] 1,363,008 1,274,267 1,205,153
Segment revenues /Total revenues 2,666,373 2,520,365 2,292,708
Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 299,901 340,697 321,883
Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 92,668 94,700 89,070
Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 239,232 244,887 173,191
Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 82,428 76,772 72,000
Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 56,231 32,163 23,811
Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 209,649 156,327 137,011
Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 98,593 100,304 101,942
Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 120,379 92,999 80,179
Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 104,284 107,249 88,468
Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,009,374 975,669 888,237
The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 106,836 104,747 85,527
Other Countries      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 187,155 165,682 113,791
Operating Segment      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,301,851 1,245,988 1,089,637
Other revenues [1] 1,362,024 1,276,684 1,208,728
Segment revenues /Total revenues 2,663,875 2,522,672 2,298,365
Operating Segment | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 297,635 339,055 321,204
Operating Segment | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 92,668 94,701 89,070
Operating Segment | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 239,483 244,943 173,279
Operating Segment | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 82,425 76,755 72,002
Operating Segment | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 55,231 31,421 23,301
Operating Segment | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 211,617 158,255 138,444
Operating Segment | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 100,137 102,689 103,457
Operating Segment | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 120,614 93,265 80,455
Operating Segment | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 102,041 104,904 88,425
Operating Segment | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 111,898 128,385 123,213
Other revenues [1] 318,009 316,953 307,802
Segment revenues /Total revenues 429,907 445,338 431,015
Operating Segment | Corporate Financial Services and Maintenance Leasing | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 5,356 9,741 10,348
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 326 347 354
Operating Segment | Corporate Financial Services and Maintenance Leasing | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 63,414 62,897 59,903
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      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,023 2,911 3,060
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 39,779 52,489 49,548
Operating Segment | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 356,997 332,013 306,282
Other revenues [1] 61,739 58,675 53,516
Segment revenues /Total revenues 418,736 390,688 359,798
Operating Segment | Real Estate | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,373 2,521 2,836
Operating Segment | Real Estate | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 92,657 94,617 88,512
Operating Segment | Real Estate | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,807 6,107 6,216
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 55,231 31,421 23,301
Operating Segment | Real Estate | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 40 0 0
Operating Segment | Real Estate | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 100,137 102,689 103,457
Operating Segment | Real Estate | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 96,509 93,265 80,455
Operating Segment | Real Estate | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,243 1,393 1,505
Operating Segment | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 336,295 349,077 323,762
Other revenues [1] 40,110 36,662 7,460
Segment revenues /Total revenues 376,405 385,739 331,222
Operating Segment | PE Investment and Concession | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 280,361 320,104 301,732
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 20 33
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      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 84 76 0
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 24,105 0 0
Operating Segment | PE Investment and Concession | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 31,745 28,877 21,997
Operating Segment | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 212,533 159,166 140,177
Other revenues [1] 3,237 1,066 1,794
Segment revenues /Total revenues 215,770 160,232 141,971
Operating Segment | Environment and Energy | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 4,200 3,861 3,816
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 214 93 45
Operating Segment | Environment and Energy | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 248 228 225
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      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 207,037 154,081 134,424
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 834 903 1,667
Operating Segment | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,626 2,062 1,667
Other revenues [1] 496,861 484,642 490,227
Segment revenues /Total revenues 499,487 486,704 491,894
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      
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 2,626 2,062 1,667
Operating Segment | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,059 6,427 4,978
Other revenues [1] 77,227 78,394 78,746
Segment revenues /Total revenues 84,286 84,821 83,724
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 482 326 207
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      
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 6,577 6,101 4,771
Operating Segment | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 11,495 7,439 3,340
Other revenues [1] 42,514 31,200 28,277
Segment revenues /Total revenues 54,009 38,639 31,617
Operating Segment | Aircraft and Ships | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 624 0 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 66 38 23
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      
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 10,805 7,401 3,317
Operating Segment | ORIX USA      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 33,016 27,100 23,278
Other revenues [1] 156,029 134,244 114,739
Segment revenues /Total revenues 189,045 161,344 138,017
Operating Segment | ORIX USA | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,023 2,251 2,407
Operating Segment | ORIX USA | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 11 84 558
Operating Segment | ORIX USA | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22,900 18,880 16,099
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      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,433 1,187 960
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 6,649 4,698 3,254
Operating Segment | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 207,829 219,207 150,388
Other revenues [1] (1,343) 1,905 10,410
Segment revenues /Total revenues 206,486 221,112 160,798
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 207,679 219,132 150,302
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      
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 150 75 86
Operating Segment | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22,103 15,112 12,552
Other revenues [1] 167,641 132,943 115,757
Segment revenues /Total revenues 189,744 148,055 128,309
Operating Segment | Asia and Australia | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,698 577 65
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 9 0 0
Operating Segment | Asia and Australia | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 18,763 13,630 11,874
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      
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 1,633 905 613
Operating Segment | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,006,637 975,450 890,193
Operating Segment | Japan | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 111,898 127,918 122,232
Operating Segment | Japan | Real Estate      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 356,997 332,013 306,282
Operating Segment | Japan | PE Investment and Concession      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 336,295 349,077 323,762
Operating Segment | Japan | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 188,196 154,311 130,077
Operating Segment | Japan | Insurance      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,626 2,062 1,667
Operating Segment | Japan | Banking and Credit      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 7,059 6,427 4,978
Operating Segment | Japan | Aircraft and Ships      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3,566 3,642 1,194
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 1
Operating Segment | The Americas      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 106,836 104,747 85,527
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 33,016 27,100 23,278
Operating Segment | The Americas | ORIX Europe      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 73,820 77,647 62,249
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 188,378 165,791 113,917
Operating Segment | Other Countries | Corporate Financial Services and Maintenance Leasing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 467 981
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 24,337 4,855 10,100
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 7,929 3,797 2,146
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 134,009 141,560 88,139
Operating Segment | Other Countries | Asia and Australia      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 22,103 15,112 12,551
Corporate And Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,514 110 (2,082)
Other revenues [1] 984 (2,417) (3,575)
Segment revenues /Total revenues 2,498 (2,307) (5,657)
Corporate And Intersegment Eliminations [Member] | Sales of goods      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,266 1,642 679
Corporate And Intersegment Eliminations [Member] | Real estate sales      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 0 (1) 0
Corporate And Intersegment Eliminations [Member] | Asset Management and Servicing      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (251) (56) (88)
Corporate And Intersegment Eliminations [Member] | Automobile related services      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 3 17 (2)
Corporate And Intersegment Eliminations [Member] | Facilities operation      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 1,000 742 510
Corporate And Intersegment Eliminations [Member] | Environment and Energy      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,968) (1,928) (1,433)
Corporate And Intersegment Eliminations [Member] | Real estate management and brokerage      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (1,544) (2,385) (1,515)
Corporate And Intersegment Eliminations [Member] | Real estate contract work      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers (235) (266) (276)
Corporate And Intersegment Eliminations [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,243 2,345 43
Corporate And Intersegment Eliminations [Member] | Japan      
Segment Reporting Information [Line Items]      
Revenues from contracts with customers 2,737 219 (1,956)
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 ¥ (1,223) ¥ (109) ¥ (126)
[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.