v3.25.2
Supplemental cash flow information - Summary of Components of Cash and Cash Equivalents (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Supplementary Cash Flow Information [Abstract]        
Cash and demand deposits ¥ 1,885,112 ¥ 1,535,476 ¥ 1,227,541  
Time deposits with original maturities of three months or less 126,375 63,169 76,452  
Money market funds 709,460 219,559 116,607  
Call loans 260,009 88,909 60,300  
Total ¥ 2,980,956 ¥ 1,907,113 ¥ 1,480,900 ¥ 2,049,636