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Fair Value Measurements (Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Parenthetical) (Detail) - JPY (¥)
¥ in Millions

3 Months Ended

6 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Mar. 31, 2023

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Aggregate loan fair value

¥ 149,390

¥ 149,390

¥ 197,041

Other assets

3,670

3,670

4,676

Policy liabilities and Policy Account Balances

160,177

160,177

163,734

Reinsurance recoverables

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Other assets

3,670

3,670

4,676

Variable Annuity and Variable Life Insurance Contracts

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Policy liabilities and Policy Account Balances

160,177

160,177

163,734

Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Aggregate loan fair value

^[1]

149,390

149,390

197,041

Other assets

3,670

3,670

4,676

Policy liabilities and Policy Account Balances

160,177

160,177

163,734

Fair Value, Measurements, Recurring | Reinsurance recoverables

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Other assets

^[2]

3,670

3,670

4,676

Fair Value, Measurements, Recurring | Variable Annuity and Variable Life Insurance Contracts

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Policy liabilities and Policy Account Balances

^[3]

160,177

160,177

163,734

Fair Value, Measurements, Recurring | Fair value option

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Gains (losses) from changes in instrument-specific credit risk

0

¥ 0

0

¥ 0

Fair Value, Measurements, Recurring | Loans Held-for-Sale

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Gains (losses) from change in fair value

1,584

191

353

(3,508)

Gains (losses) from changes in instrument-specific credit risk

0

0

Aggregate unpaid loan principal balance

151,043

151,043

199,674

Aggregate loan fair value

149,390

149,390

197,041

Amount by which aggregate fair value of loan was less than aggregate unpaid loan principal balance

1,653

1,653

2,633

Fair Value, Measurements, Recurring | Japanese and foreign government bond securities

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Gains (losses) from change in fair value

(7)

(13)

(7)

(21)

Fair Value, Measurements, Recurring | Japanese and foreign government bond securities | Fair value option

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Amounts aggregate fair value elected fair value option

314

314

237

Fair Value, Measurements, Recurring | Corporate debt securities

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Gains (losses) from change in fair value

(53)

(325)

(48)

(977)

Fair Value, Measurements, Recurring | Corporate debt securities | Fair value option

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Amounts aggregate fair value elected fair value option

7,133

7,133

6,605

Fair Value, Measurements, Recurring | Equity securities

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Gains (losses) from change in fair value

367

¥ 6

819

¥ 546

Fair Value, Measurements, Recurring | Equity securities | Fair value option

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Amounts aggregate fair value elected fair value option

19,401

19,401

16,032

Amounts investment funds measured at net asset value per share are not included in above tables

68,018

68,018

51,263

Fair Value, Measurements, Recurring | Investment In Affiliates | Fair value option

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Amounts aggregate fair value elected fair value option

5,003

5,003

¥ 2,511

Fair Value, Measurements, Recurring | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Aggregate unpaid loan principal balance

6,911

6,911

Aggregate loan fair value

6,667

6,667

Amount by which aggregate fair value of loan was less than aggregate unpaid loan principal balance

¥ 244

¥ 244

[1]	A certain subsidiary elected the fair value option on certain loans held for sale. These loans are multi-family and seniors housing loans and are sold to Federal National Mortgage Association (“Fannie Mae”), Federal Home Loan Mortgage Corporation (“Freddie Mac”) and institutional investors. Included in “Other (income) and expense” in the consolidated statements of income were a loss of ¥3,508 million and a gain of ¥353 million from the change in the fair value of the loans for the six months ended September 30, 2022 and 2023, respectively. Included in “Other (income) and expense” in the consolidated statements of income were a gain of ¥191 million and a gain of ¥1,584 million from the change in the fair value of the loans for the three months ended September 30, 2022 and 2023, respectively. No gains or losses were recognized in earnings during the six months ended September 30, 2022 and 2023 attributable to changes in instrument-specific credit risk. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of March 31, 2023, were ¥199,674 million and ¥197,041 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥2,633 million. The amounts of aggregate unpaid principal balance and aggregate fair value of the loans held for sale as of September 30, 2023, were ¥151,043 million and ¥149,390 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥1,653 million. As of March 31, 2023 and September 30, 2023, there were no loans that are 90 days or more past due or, in non-accrual status.
[2]	Certain subsidiaries elected the fair value option for certain reinsurance contracts held. The fair value of the reinsurance contracts elected for the fair value option in other assets were ¥4,676 million and ¥3,670 million as of March 31, 2023 and September 30, 2023, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings during the six and three months ended September 30, 2022 and 2023, see Note 17 “Life Insurance Operations.”
[3]	Certain subsidiaries elected the fair value option for the entire variable annuity and variable life insurance contracts held. The fair value of the variable annuity and variable life insurance contracts elected for the fair value option in policy liabilities and policy account balances were ¥163,734 million and ¥160,177 million as of March 31, 2023 and September 30, 2023, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings during the six and three months ended September 30, 2022 and 2023, see Note 17 “Life Insurance Operations.”

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