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Acquisitions and Divestitures - Other Intangible Assets Recognized in Acquisition (Detail)
¥ in Millions
12 Months Ended
Mar. 31, 2023
JPY (¥)
License [Member]  
Business Acquisition [Line Items]  
Weighted average amortization period 15 years
DHC Corporation [Member]  
Business Acquisition [Line Items]  
Intangible assets that have indefinite useful lives ¥ 68,800
Intangibles subject to amortization 15,500
Acquired intangibles recorded at fair value 84,300
DHC Corporation [Member] | License [Member]  
Business Acquisition [Line Items]  
Intangibles subject to amortization ¥ 15,500
Weighted average amortization period 15 years
DHC Corporation [Member] | Trade Names [Member]  
Business Acquisition [Line Items]  
Intangible assets that have indefinite useful lives ¥ 68,800