v3.25.2
Equity and Other Equity Items - Disclosure of Detailed Information About Other Comprehensive Income and the Corresponding Tax Benefits (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Net changes in revaluation of financial assets measured at fair value through other comprehensive income      
Amount incurred during the year (Before tax) ¥ 153,164 ¥ 806,365 ¥ 144,160
Amount incurred during the year (Tax effect) (51,035) (248,826) (44,936)
Amount incurred during the year (After tax) 102,129 557,539 99,223
Net changes (Before tax) 153,164 806,365 144,160
Net changes (Tax effect) (51,035) (248,826) (44,936)
Net changes (After tax) 102,129 557,539 99,223
Remeasurements of defined benefit plans      
Amount incurred during the year (Before tax) (154,517) 57,616 112,151
Amount incurred during the year (Tax effect) 44,919 (11,289) (46,998)
Amount incurred during the year (After tax) (109,598) 46,328 65,153
Net changes (Before tax) (154,517) 57,616 112,151
Net changes (Tax effect) 44,919 (11,289) (46,998)
Net changes (After tax) (109,598) 46,328 65,153
Shares of other comprehensive income of equity method investees      
Amount incurred during the year (Before tax) (63,213) 156,118 (77,148)
Amount incurred during the year (After tax) (63,213) 156,118 (77,148)
Net changes (Before tax) (63,213) 156,118 (77,148)
Net changes (After tax) (63,213) 156,118 (77,148)
Exchange differences on translating foreign operations      
Amount incurred during the year (Before tax) (40,479) 1,178,875 676,042
Amount incurred during the year (After tax) (40,479) 1,178,875 676,042
Reclassification to profit (loss) (Before tax) (787,369)    
Reclassification to profit (loss) (After tax) (787,369)    
Net changes (Before tax) (827,848) 1,178,875 676,042
Net changes (After tax) (827,848) 1,178,875 676,042
Net changes in revaluation of financial assets measured at fair value through other comprehensive income      
Amount incurred during the year (Before tax) 40,503 33,256 (165,477)
Amount incurred during the year (Tax effect) (9,485) (10,459) 49,738
Amount incurred during the year (After tax) 31,018 22,797 (115,738)
Reclassification to profit (loss) (Before tax) 189 (15,267) 0
Reclassification to profit (loss) (Tax effect) (49) 4,717 0
Reclassification to profit (loss) (After tax) 140 (10,550) 0
Net changes (Before tax) 40,693 17,989 (165,477)
Net changes (Tax effect) (9,534) (5,742) 49,738
Net changes (After tax) 31,158 12,247 (115,738)
Shares of other comprehensive income of equity method investees      
Amount incurred during the year (Before tax) 127,022 182,576 180,181
Amount incurred during the year (After tax) 127,022 182,576 180,181
Reclassification to profit (loss) (Before tax) (5,682) (16,579)  
Reclassification to profit (loss) (After tax) (5,682) (16,579)  
Net changes (Before tax) 121,340 165,996 180,181
Net changes (After tax) 121,340 165,996 180,181
Total other comprehensive income (Before tax) (730,381) 2,382,959 869,909
Total other comprehensive income (Tax effect) (15,650) (265,856) (42,196)
Total other comprehensive income, net of tax ¥ (746,031) ¥ 2,117,103 ¥ 827,713