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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, 2025
Mar. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables ¥ 5,296,674 ¥ 5,105,469
Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 152,141 146,652
30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 32,653 34,490
90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 119,488 112,162
Consumer borrowers    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,108,053 2,067,900
Consumer borrowers | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 11,599 12,126
Consumer borrowers | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,541 4,481
Consumer borrowers | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 9,058 7,645
Consumer borrowers | Real estate loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,001,575 1,956,816
Consumer borrowers | Real estate loans | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 7,619 7,959
Consumer borrowers | Real estate loans | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 752 2,536
Consumer borrowers | Real estate loans | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 6,867 5,423
Consumer borrowers | Card loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 65,759 67,874
Consumer borrowers | Card loans | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 395 355
Consumer borrowers | Card loans | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 395 355
Consumer borrowers | Card loans | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 0 0
Consumer borrowers | Other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 40,719 43,210
Consumer borrowers | Other | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 3,585 3,812
Consumer borrowers | Other | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 1,394 1,590
Consumer borrowers | Other | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,191 2,222
Corporate borrowers    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 1,850,367 1,738,136
Corporate borrowers | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 99,821 93,836
Corporate borrowers | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 7,676 9,896
Corporate borrowers | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 92,145 83,940
Corporate borrowers | Non-recourse Loans | Japan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 338,230 301,477
Corporate borrowers | Non-recourse Loans | Japan | Past-due financing 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   86,724
Corporate borrowers | Non-recourse Loans | The Americas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables   5,837
Corporate borrowers | Non-recourse Loans | Overseas    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 151,269  
Corporate borrowers | Non-recourse Loans | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 4,691  
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 0 0
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | The Americas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables   2,141
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 0  
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | Japan | Past-due financing 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 financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables   3,696
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 4,691  
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 447,544 415,666
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 317 229
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 155,813 131,042
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 72,318 51,310
Corporate borrowers | Other than non-recourse loans | Real estate companies | 30-89 days past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 285 200
Corporate borrowers | Other than non-recourse loans | Real estate companies | 30-89 days past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 78 36
Corporate borrowers | Other than non-recourse loans | Real estate companies | 90 days or more past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 32 29
Corporate borrowers | Other than non-recourse loans | Real estate companies | 90 days or more past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 72,240 51,274
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 215,988 225,900
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,925 2,512
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 541,523 577,327
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 19,570 33,948
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 30-89 days past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,374 1,992
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 30-89 days past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 4,939 5,527
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 90 days or more past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 551 520
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | 90 days or more past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 14,631 28,421
Loans to Equity Method Investees    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 137,585 132,053
Loans to Equity Method Investees | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 4 0
Loans to Equity Method Investees | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 0 0
Loans to Equity Method Investees | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 4 0
Net investment in leases    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 1,200,669 1,167,380
Net investment in leases | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 40,717 40,690
Net investment in leases | Japan    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 615,211 618,963
Net investment in leases | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 6,389 7,766
Net investment in leases | Overseas    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 585,458 548,417
Net investment in leases | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 34,328 32,924
Net investment in leases | 30-89 days past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 22,436 20,113
Net investment in leases | 30-89 days past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 2,452 3,851
Net investment in leases | 30-89 days past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 19,984 16,262
Net investment in leases | 90 days or more past-due | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 18,281 20,577
Net investment in leases | 90 days or more past-due | Japan | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables 3,937 3,915
Net investment in leases | 90 days or more past-due | Overseas | Past-due financing assets    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total financing receivables ¥ 14,344 ¥ 16,662