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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 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | --- | ---
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | ¥ 1,032,810 |  | ¥ 1,231,860 |  |
Restricted Cash |  | 152,497 |  | 135,048 |  |
Equity securities | [1] | 597,601 |  | 500,832 |  |
Trading debt securities |  | 0 |  | 2,179 |  |
Available-for-sale debt securities |  | 2,665,478 |  | 2,234,608 |  |
Held-to-maturity debt securities | [2] | 0 |  | 114,759 |  |
Other Assets: |  |  |  |  |  |
Derivative assets |  | 25,490 |  | 50,346 |  |
Liabilities: |  |  |  |  |  |
Short-term debt |  | 574,095 |  | 508,796 |  |
Deposits |  | 2,245,835 |  | 2,246,345 |  |
Policy liabilities and Policy account balances (Investment contracts) |  | 1,892,510 |  | 1,832,057 |  | ¥ 1,912,698
Long-term debt |  | 5,626,376 |  | 5,209,723 |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities |  | ¥ 48,190 |  | ¥ 49,314 |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities |  | Other Liabilities |  |
Level 1 |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | ¥ 1,032,810 |  | ¥ 1,231,860 |  |
Restricted Cash |  | 152,497 |  | 135,048 |  |
Installment loans (net of allowance for credit losses) |  | 0 |  | 0 |  |
Equity securities |  | 108,964 | [3] | 105,646 | [4] |
Trading debt securities |  |  |  | 0 |  |
Available-for-sale debt securities |  | 11,491 |  | 4,334 |  |
Held-to-maturity debt securities |  |  |  | 0 |  |
Other Assets: |  |  |  |  |  |
Time deposits |  | 0 |  | 0 |  |
Derivative assets | [5] | 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 |  |
Accounts payable (Contingent consideration) |  | 0 |  |  |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities | [5] | 0 |  | 0 |  |
Level 2 |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted Cash |  | 0 |  | 0 |  |
Installment loans (net of allowance for credit losses) |  | 163,536 |  | 131,171 |  |
Equity securities |  | 143,786 | [3] | 133,027 | [4] |
Trading debt securities |  |  |  | 2,179 |  |
Available-for-sale debt securities |  | 2,334,690 |  | 1,986,672 |  |
Held-to-maturity debt securities |  |  |  | 108,326 |  |
Other Assets: |  |  |  |  |  |
Time deposits |  | 2,033 |  | 4,374 |  |
Derivative assets | [5] | 0 |  | 0 |  |
Reinsurance recoverables (Investment contracts) |  | 0 |  | 0 |  |
Liabilities: |  |  |  |  |  |
Short-term debt |  | 574,095 |  | 508,796 |  |
Deposits |  | 2,073,845 |  | 2,087,035 |  |
Policy liabilities and Policy account balances (Investment contracts) |  | 0 |  | 0 |  |
Long-term debt |  | 1,769,943 |  | 1,667,119 |  |
Accounts payable (Contingent consideration) |  | 0 |  |  |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities | [5] | 0 |  | 0 |  |
Level 3 |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted Cash |  | 0 |  | 0 |  |
Installment loans (net of allowance for credit losses) |  | 3,736,152 |  | 3,702,156 |  |
Equity securities |  | 162,857 | [3] | 143,074 | [4] |
Trading debt securities |  |  |  | 0 |  |
Available-for-sale debt securities |  | 319,297 |  | 243,602 |  |
Held-to-maturity debt securities |  |  |  | 21,352 |  |
Other Assets: |  |  |  |  |  |
Time deposits |  | 0 |  | 0 |  |
Derivative assets | [5] | 0 |  | 0 |  |
Reinsurance recoverables (Investment contracts) |  | 4,550 |  | 5,009 |  |
Liabilities: |  |  |  |  |  |
Short-term debt |  | 0 |  | 0 |  |
Deposits |  | 0 |  | 0 |  |
Policy liabilities and Policy account balances (Investment contracts) |  | 121,966 |  | 143,842 |  |
Long-term debt |  | 3,824,945 |  | 3,496,993 |  |
Accounts payable (Contingent consideration) |  | 14,136 |  |  |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities | [5] | 0 |  | 0 |  |
Carrying amount |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 1,032,810 |  | 1,231,860 |  |
Restricted Cash |  | 152,497 |  | 135,048 |  |
Installment loans (net of allowance for credit losses) |  | 3,918,504 |  | 3,856,206 |  |
Equity securities |  | 415,607 | [3] | 381,747 | [4] |
Trading debt securities |  |  |  | 2,179 |  |
Available-for-sale debt securities |  | 2,665,478 |  | 2,234,608 |  |
Held-to-maturity debt securities |  |  |  | 114,759 |  |
Other Assets: |  |  |  |  |  |
Time deposits |  | 2,033 |  | 4,374 |  |
Derivative assets | [5] | 25,490 |  | 50,346 |  |
Reinsurance recoverables (Investment contracts) |  | 4,592 |  | 5,301 |  |
Liabilities: |  |  |  |  |  |
Short-term debt |  | 574,095 |  | 508,796 |  |
Deposits |  | 2,074,828 |  | 2,086,340 |  |
Policy liabilities and Policy account balances (Investment contracts) |  | 122,686 |  | 143,407 |  |
Long-term debt |  | 5,626,376 |  | 5,209,723 |  |
Accounts payable (Contingent consideration) |  | 14,136 |  |  |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities | [5] | 48,190 |  | 49,314 |  |
Estimated fair value |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 1,032,810 |  | 1,231,860 |  |
Restricted Cash |  | 152,497 |  | 135,048 |  |
Installment loans (net of allowance for credit losses) |  | 3,899,688 |  | 3,833,327 |  |
Equity securities |  | 415,607 | [3] | 381,747 | [4] |
Trading debt securities |  |  |  | 2,179 |  |
Available-for-sale debt securities |  | 2,665,478 |  | 2,234,608 |  |
Held-to-maturity debt securities |  |  |  | 129,678 |  |
Other Assets: |  |  |  |  |  |
Time deposits |  | 2,033 |  | 4,374 |  |
Derivative assets | [5] | 25,490 |  | 50,346 |  |
Reinsurance recoverables (Investment contracts) |  | 4,550 |  | 5,009 |  |
Liabilities: |  |  |  |  |  |
Short-term debt |  | 574,095 |  | 508,796 |  |
Deposits |  | 2,073,845 |  | 2,087,035 |  |
Policy liabilities and Policy account balances (Investment contracts) |  | 121,966 |  | 143,842 |  |
Long-term debt |  | 5,594,888 |  | 5,164,112 |  |
Accounts payable (Contingent consideration) |  | 14,136 |  |  |  |
Other Liabilities: |  |  |  |  |  |
Derivative liabilities | [5] | ¥ 48,190 |  | ¥ 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 ¥161,244 million as of March 31, 2023 and 2024, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥18,544 million and ¥26,945 million as of March 31, 2023 and 2024, respectively.
[2] | During fiscal 2024, bonds held as held-to-maturity debt securities were reclassified to available-for-sale debt securities. This is because a certain subsidiary changed its holding purposes in accordance with ASC 320 (“Investments—Debt Securities”) in order to improve profitability by building a flexible investment portfolio and improve capital stability. At the time of reclassification, the book value of held-to-maturity debt securities was ¥115,507 million and the related unrealized gain was ¥7,913 million.
[3] | The amount of ¥85,280 million of investment funds measured at net asset value per share is not included.
[4] | The amount of ¥51,263 million of investment funds measured at net asset value per share is not included.
[5] | It represents the amount after offset under counterparty netting of derivative assets and liabilities. For the information of input level before netting, see Note 2 “Fair Value Measurements.”

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