v3.25.2
Equity and Other Equity Items - Disclosure of Matters Relating To Repurchase (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
March 23, 2022 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares repurchased     44,114,900
Total purchase price for repurchase of shares     ¥ 95,392
May 11, 2022 and November 1, 2022 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares repurchased     169,429,000
Total purchase price for repurchase of shares     ¥ 335,685
May 10, 2023 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares repurchased   64,590,700  
Total purchase price for repurchase of shares   ¥ 150,000  
November 1, 2023 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares repurchased 5,216,600 26,880,600  
Total purchase price for repurchase of shares ¥ 18,962 ¥ 81,037  
May 8, 2024 and september 24, 2024 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares repurchased 420,633,175    
Total purchase price for repurchase of shares ¥ 1,160,051    
May 8, 2024 [member]      
Disclosure of treasury shares [Line items]      
Number of common shares retired 520,000,000