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Fair Value Measurements (Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail)
¥ in Millions
Mar. 31, 2023
JPY (¥)
Mar. 31, 2022
JPY (¥)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale ¥ 197,041 ¥ 151,601
Available-for-sale debt securities 2,234,608 2,174,891
Equity securities [1] 589,312 560,643
Certain investment in affiliates 2,511 0
Derivative assets 50,346 31,033
Other assets 4,676 5,214
Derivative Liability 49,314 85,372
Policy liabilities and Policy Account Balances 163,734 198,905
Reinsurance recoverables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy liabilities and Policy Account Balances 4,676 5,214
Variable Annuity and Variable Life Insurance Contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy liabilities and Policy Account Balances 163,734 198,905
Japanese prefectural and foreign municipal bond securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 369,246 325,604
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 784,388 849,560
Other asset-backed securities and debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 236,506 138,382
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 243,602 141,060
Equity securities 140,563 [2] 112,972 [3]
Certain investment in affiliates 2,511  
Derivative assets [4] 0 0
Derivative Liability [4] 0 0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale [5] 197,041 151,601
Available-for-sale debt securities 2,234,608 2,174,891
Certain investment in affiliates [6] 2,511  
Derivative assets 50,346 31,033
Other assets 4,676 5,214
Total 2,892,649 2,770,846
Derivative Liability 49,314 85,372
Policy liabilities and Policy Account Balances 163,734 198,905
Total financial liabilities 235,100 304,610
Fair Value, Measurements, Recurring | Reinsurance recoverables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets [7] 4,676 5,214
Fair Value, Measurements, Recurring | Variable Annuity and Variable Life Insurance Contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy liabilities and Policy Account Balances [8] 163,734 198,905
Fair Value, Measurements, Recurring | Japanese prefectural and foreign municipal bond securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 369,246 325,604
Fair Value, Measurements, Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities [9] 784,388 849,560
Fair Value, Measurements, Recurring | Other asset-backed securities and debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 236,506 138,382
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale [5] 173,849 0
Available-for-sale debt securities 243,602 141,060
Certain investment in affiliates [6] 2,511  
Derivative assets 0 0
Other assets 4,676 5,214
Total 572,019 264,106
Derivative Liability 0 0
Policy liabilities and Policy Account Balances 163,734 198,905
Total financial liabilities 178,376 207,537
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain investment in affiliates 2,511  
Fair Value, Measurements, Recurring | Level 3 | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 173,849  
Fair Value, Measurements, Recurring | Level 3 | Reinsurance recoverables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets [7] 4,676 5,214
Fair Value, Measurements, Recurring | Level 3 | Reinsurance recoverables | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 4,676 5,214
Fair Value, Measurements, Recurring | Level 3 | Variable Annuity and Variable Life Insurance Contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy liabilities and Policy Account Balances [8] 163,734 198,905
Fair Value, Measurements, Recurring | Level 3 | Variable Annuity and Variable Life Insurance Contracts | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy liabilities and Policy Account Balances 163,734 198,905
Fair Value, Measurements, Recurring | Level 3 | Japanese prefectural and foreign municipal bond securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,331 3,053
Fair Value, Measurements, Recurring | Level 3 | Japanese prefectural and foreign municipal bond securities | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,331 3,053
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities [9] 4,737 697
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 280 697
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities ¥ 4,457  
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.004  
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities ¥ 235,534 137,310
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 29,165 25,666
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities ¥ 206,369 ¥ 111,644
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed securities and debt securities | Probability of default | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.019 0.019
Fair Value, Measurements, Recurring | Level 3 | Investment funds, and others | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities   ¥ 86,903
Fair Value, Measurements, Recurring | Level 3 | Investment funds, and others | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities   26,069
Fair Value, Measurements, Recurring | Level 3 | Investment funds | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities ¥ 120,744  
Fair Value, Measurements, Recurring | Level 3 | Investment funds | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 19,819  
Fair Value, Measurements, Recurring | Level 3 | Options held/written and other | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 6,818 4,792
Derivative Liability 14,603 8,600
Fair Value, Measurements, Recurring | Level 3 | Options held/written and other | Appraisals/Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   68
Derivative Liability ¥ 39 ¥ 32
Fair Value, Measurements, Recurring | Level 3 | Minimum | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Loans held for sale 0.08  
Significant unobservable inputs, Certain investment in affiliates 0.08  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets (0.004) (0.002)
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.015 0.015
Fair Value, Measurements, Recurring | Level 3 | Minimum | Reinsurance recoverables | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable Annuity and Variable Life Insurance Contracts | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances (0.004) (0.002)
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable Annuity and Variable Life Insurance Contracts | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0 0
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable Annuity and Variable Life Insurance Contracts | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.015 0.015
Fair Value, Measurements, Recurring | Level 3 | Minimum | Variable Annuity and Variable Life Insurance Contracts | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0 0
Fair Value, Measurements, Recurring | Level 3 | Minimum | Corporate debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities   0.004
Fair Value, Measurements, Recurring | Level 3 | Minimum | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.002 0.001
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds, and others | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   0.119
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds, and others | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   8.3
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds, and others | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   6.4
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds, and others | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   5.7
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds, and others | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   7.6
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 0.119  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 7.5  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 5.5  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 4.9  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Investment funds | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 7.5  
Fair Value, Measurements, Recurring | Level 3 | Minimum | Options held/written and other | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Derivative assets 0.12 0.12
Significant unobservable inputs, Derivative liabilities 0.12 0.12
Fair Value, Measurements, Recurring | Level 3 | Maximum | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Loans held for sale 0.10  
Significant unobservable inputs, Certain investment in affiliates 0.12  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.015 0.007
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 1 1
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.14 0.14
Fair Value, Measurements, Recurring | Level 3 | Maximum | Reinsurance recoverables | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 1 1
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable Annuity and Variable Life Insurance Contracts | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.015 0.007
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable Annuity and Variable Life Insurance Contracts | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 1 1
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable Annuity and Variable Life Insurance Contracts | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.30 0.30
Fair Value, Measurements, Recurring | Level 3 | Maximum | Variable Annuity and Variable Life Insurance Contracts | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 1 1
Fair Value, Measurements, Recurring | Level 3 | Maximum | Corporate debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities   0.007
Fair Value, Measurements, Recurring | Level 3 | Maximum | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.512 0.512
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds, and others | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   0.186
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds, and others | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   12
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds, and others | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   12.6
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds, and others | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   12.5
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds, and others | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   14.5
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 0.264  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 12  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 8.7  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 8.9  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Investment funds | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 14.5  
Fair Value, Measurements, Recurring | Level 3 | Maximum | Options held/written and other | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Derivative assets 0.32 0.34
Significant unobservable inputs, Derivative liabilities 0.32 0.34
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Loans held for sale 0.09  
Significant unobservable inputs, Certain investment in affiliates 0.10  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.004 0.002
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.026 0.021
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 0.05 0.055
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Reinsurance recoverables | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Other assets 1 1
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable Annuity and Variable Life Insurance Contracts | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.004 0.002
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable Annuity and Variable Life Insurance Contracts | Mortality Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.021 0.019
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable Annuity and Variable Life Insurance Contracts | Lapse Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.059 0.062
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Variable Annuity and Variable Life Insurance Contracts | Annuitization Rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Policy liabilities and Policy Account Balances 0.688 0.718
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Corporate debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.004 0.005
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Other asset-backed securities and debt securities | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.089 0.106
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Other asset-backed securities and debt securities | Probability of default | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Available-for-sale debt securities 0.019 0.019
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds, and others | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   0.163
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds, and others | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   9.9
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds, and others | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   9.5
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds, and others | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   9.4
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds, and others | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities   10.3
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | WACC | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 0.172  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Terminal EBITDA multiple | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 9.5  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 7.9  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Forward EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 7.6  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Investment funds | EV/Precedent transaction last twelve months EBITDA multiple | Market Multiples    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs. Equity securities 10  
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Options held/written and other | Discount rate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Significant unobservable inputs, Derivative assets 0.144 0.149
Significant unobservable inputs, Derivative liabilities 0.144 0.149
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥185,115 million and ¥151,445 million as of March 31, 2022 and 2023, respectively. The amount of investment funds that are accounted for under the equity method included in equity securities were ¥90,650 million and ¥ 90,993 million as of March 31, 2022 and 2023, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥11,709 million and ¥16,032 million as of March 31, 2022 and 2023, respectively.
[2] The amount of ¥51,263 million of investment funds measured at net asset value per share is not included.
[3] The amount of ¥25,999 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 2 “Fair Value Measurements.”
[5] 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 losses of ¥3,260 million, ¥2,982 million and ¥2,429 million from the change in the fair value of the loans for fiscal 2021, 2022 and 2023, respectively. No gains or losses were recognized in earnings during fiscal 2021, 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, 2022, were ¥151,672 million and ¥151,601 million, respectively, and the amount of the aggregate fair value was less than the amount of aggregate unpaid principal balance by ¥71 million. 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. As of March 31, 2022 and 2023, there were no loans that are 90 days or more past due or, in non-accrual status.
[6] A certain subsidiary elected the fair value option for certain investment in affiliates. No gains or losses were recognized in earnings from the change in the fair value of those investments for fiscal 2021, 2022 and 2023. There were no such investments elected the fair value option as of March 31, 2022. The amounts of aggregate fair value elected the fair value option were ¥2,511million as of March 31, 2023.
[7] 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 ¥5,214 million and ¥4,676 million as of March 31, 2022 and 2023, respectively. For the effect of changes in the fair value of those reinsurance contracts on earnings for fiscal 2021, 2022 and 2023, see Note 23 “Life Insurance Operations.”
[8] 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 ¥198,905 million and ¥163,734 million as of March 31, 2022 and 2023, respectively. For the effect of changes in the fair value of the variable annuity and variable life insurance contracts on earnings for fiscal 2021, 2022 and 2023, see Note 23 “Life Insurance Operations.”
[9] A certain subsidiary elected the fair value option for investments in foreign corporate debt securities included in available-for-sale debt securities. Included in “Gains on investment securities and dividends” in the consolidated statements of income were a gain of ¥1,080 million and losses of ¥365 million and ¥516 million from the change in the fair value of those investments for fiscal 2021, 2022 and 2023, respectively. The amounts of aggregate fair value elected the fair value option were ¥7,644 million and ¥6,605 million as of March 31, 2022 and 2023, respectively.