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Write-Downs of Long-Lived Assets - Breakdowns of Recognized Impairment Losses for Difference between Carrying Amounts and Fair Values Reflected as Write-Downs of Long-Lived Assets (Detail) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 JPY (¥) Property | Mar. 31, 2022 JPY (¥) Property | Mar. 31, 2021 JPY (¥) Property
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 243 | ¥ 12,749 | ¥ 1,067
Write-downs of the assets held for sale, number of properties | Property |  |  |  |
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 2,054 | ¥ 22,917 | ¥ 1,953
Write-downs due to decline in estimated future cash flows, number of properties | Property |  |  |  |
Office Buildings |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 0 |  | ¥ 0
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 1,535 |  | ¥ 331
Write-downs due to decline in estimated future cash flows, number of properties | Property |  | 2 |  | 1
Commercial facilities other than office buildings |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 0 | ¥ 858 | ¥ 1,067
Write-downs of the assets held for sale, number of properties | Property |  |  | 3 | 5
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 51 | ¥ 11 | ¥ 189
Write-downs due to decline in estimated future cash flows, number of properties | Property |  | 2 | 1 | 1
Condominiums |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount |  | ¥ 2 | ¥ 13 | ¥ 0
Write-downs of the assets held for sale, number of properties | Property |  | 1 | 2 |
Write-downs due to decline in estimated future cash flows, amount |  | ¥ 15 | ¥ 83 | ¥ 64
Write-downs due to decline in estimated future cash flows, number of properties | Property |  | 19 | 49 | 2
Land undeveloped or under construction |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount |  |  |  | ¥ 0
Write-downs due to decline in estimated future cash flows, amount |  |  |  | ¥ 98
Write-downs due to decline in estimated future cash flows, number of properties | Property |  |  |  | 2
Others |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write-downs of the assets held for sale, amount | [1] | ¥ 241 | ¥ 11,878 | ¥ 0
Write-downs due to decline in estimated future cash flows, amount | [1] | ¥ 453 | ¥ 22,823 | ¥ 1,271
[1] | For the “Others”, the numbers of properties are omitted. Write-downs of long-lived assets for fiscal 2021 include write-downs of ¥1,099 million of hotels. Write-downs of long-lived assets for fiscal 2022 include write-downs of ¥31,205 million of property under facility operations and others held by subsidiaries, of which ¥19,564 million related to write-downs of two coal-biomass co-fired power plants, and ¥2,331 million of two aircraft.

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- Definition Impairment of long lived assets to be disposed of due to decline in estimated future cash flows. + References No definition available. + Details
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- Definition Number Of Impaired Assets Impairment Due To Assets Held For Sale. + References No definition available. + Details
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- Definition Number of impaired assets impairment due to decline in estimated future cash flows. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2611-110228 + Details
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