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Estimated Fair Value of Financial Instruments (Information about Carrying Amount of Financial Instruments Reported in Consolidated Balance Sheets and Related Market or Fair Value) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Assets:        
Cash and cash equivalents ¥ 915,107 ¥ 1,231,860 ¥ 925,965  
Restricted Cash 139,123 135,048    
Equity securities [1] 751,872 589,312    
Trading debt securities 2,259 2,179    
Available-for-sale debt securities 2,318,317 2,234,608    
Held-to-maturity debt securities 115,515 114,759    
Certain investment in affiliates 5,003 2,511    
Other Assets:        
Derivative assets 56,348 50,346    
Liabilities:        
Short-term debt 586,379 508,796    
Deposits 2,223,592 2,246,345    
Policy liabilities and Policy account balances (Investment contracts) 1,783,074 1,832,057   ¥ 1,912,698
Long-term debt 5,448,244 5,209,723    
Other Liabilities:        
Derivative liabilities ¥ 55,951 ¥ 49,314    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities    
Level 1        
Assets:        
Cash and cash equivalents ¥ 915,107 ¥ 1,231,860    
Restricted Cash 139,123 135,048    
Installment loans (net of allowance for credit losses) 0 0    
Equity securities 116,421 [2] 105,646 [3]    
Trading debt securities 0 0    
Available-for-sale debt securities 5,282 4,334    
Held-to-maturity debt securities 0 0    
Certain investment in affiliates 0 0    
Other Assets:        
Time deposits 0 0    
Derivative assets [4] 0 0    
Reinsurance recoverables (Investment contracts) 0 0    
Liabilities:        
Short-term debt 0 0    
Deposits 0 0    
Policy liabilities and Policy account balances (Investment contracts) 0 0    
Long-term debt 0 0    
Other Liabilities:        
Derivative liabilities [4] 0 0    
Level 2        
Assets:        
Cash and cash equivalents 0 0    
Restricted Cash 0 0    
Installment loans (net of allowance for credit losses) 136,985 128,249    
Equity securities 133,647 [2] 133,027 [3]    
Trading debt securities 2,259 2,179    
Available-for-sale debt securities 2,030,880 1,986,672    
Held-to-maturity debt securities 104,028 108,326    
Certain investment in affiliates 0 0    
Other Assets:        
Time deposits 4,600 4,374    
Derivative assets [4] 0 0    
Reinsurance recoverables (Investment contracts) 0 0    
Liabilities:        
Short-term debt 586,379 508,796    
Deposits 2,052,118 2,087,035    
Policy liabilities and Policy account balances (Investment contracts) 0 0    
Long-term debt 1,815,990 1,667,119    
Other Liabilities:        
Derivative liabilities [4] 0 0    
Level 3        
Assets:        
Cash and cash equivalents 0 0    
Restricted Cash 0 0    
Installment loans (net of allowance for credit losses) 3,740,277 3,679,738    
Equity securities 160,131 [2] 140,563 [3]    
Trading debt securities 0 0    
Available-for-sale debt securities 282,155 243,602    
Held-to-maturity debt securities 20,092 21,352    
Certain investment in affiliates 5,003 2,511    
Other Assets:        
Time deposits 0 0    
Derivative assets [4] 0 0    
Reinsurance recoverables (Investment contracts) 4,566 5,009    
Liabilities:        
Short-term debt 0 0    
Deposits 0 0    
Policy liabilities and Policy account balances (Investment contracts) 133,208 143,842    
Long-term debt 3,572,108 3,496,993    
Other Liabilities:        
Derivative liabilities [4] 0 0    
Carrying amount        
Assets:        
Cash and cash equivalents 915,107 1,231,860    
Restricted Cash 139,123 135,048    
Installment loans (net of allowance for credit losses) 3,895,424 3,829,431    
Equity securities 410,199 [2] 379,236 [3]    
Trading debt securities 2,259 2,179    
Available-for-sale debt securities 2,318,317 2,234,608    
Held-to-maturity debt securities 115,515 114,759    
Certain investment in affiliates 5,003 2,511    
Other Assets:        
Time deposits 4,600 4,374    
Derivative assets [4] 56,348 50,346    
Reinsurance recoverables (Investment contracts) 4,943 5,301    
Liabilities:        
Short-term debt 586,379 508,796    
Deposits 2,051,992 2,086,340    
Policy liabilities and Policy account balances (Investment contracts) 133,841 143,407    
Long-term debt 5,448,244 5,209,723    
Other Liabilities:        
Derivative liabilities [4] 55,951 49,314    
Estimated fair value        
Assets:        
Cash and cash equivalents 915,107 1,231,860    
Restricted Cash 139,123 135,048    
Installment loans (net of allowance for credit losses) 3,877,262 3,807,987    
Equity securities 410,199 [2] 379,236 [3]    
Trading debt securities 2,259 2,179    
Available-for-sale debt securities 2,318,317 2,234,608    
Held-to-maturity debt securities 124,120 129,678    
Certain investment in affiliates 5,003 2,511    
Other Assets:        
Time deposits 4,600 4,374    
Derivative assets [4] 56,348 50,346    
Reinsurance recoverables (Investment contracts) 4,566 5,009    
Liabilities:        
Short-term debt 586,379 508,796    
Deposits 2,052,118 2,087,035    
Policy liabilities and Policy account balances (Investment contracts) 133,208 143,842    
Long-term debt 5,388,098 5,164,112    
Other Liabilities:        
Derivative liabilities [4] ¥ 55,951 ¥ 49,314    
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥151,445 million and ¥151,281 million as of March 31, 2023 and September 30, 2023, respectively. The amount of investment funds that are accounted for under the equity method included in equity securities were ¥90,993 million and ¥196,899 million as of March 31, 2023 and September 30, 2023, respectively. The amount of investment funds elected the fair value option included in equity securities were ¥16,032 million and ¥19,401 million as of March 31, 2023 and September 30, 2023, respectively.
[2] The amount of ¥68,018 million of investment funds measured at net asset value per share is not included.
[3] The amount of ¥51,263 million of investment funds measured at net asset value per share is not included.
[4] It represents the amount after offset under counterparty netting of derivative assets and liabilities. For the information of input level before netting, see Note 3 “Fair Value Measurements.”