v3.25.2
Business Segments (Financial Information by Business Segment) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Business segment information      
Net revenue: ¥ 4,810,500 ¥ 4,752,600 ¥ 4,515,800
Net interest income 3,088,197 2,624,923 2,402,614
Operating expenses 3,244,800 2,921,200 2,938,400
Operating profit (loss) 1,565,700 1,831,400 1,577,400
Fixed assets: 1,383,200 1,395,000 1,368,100
Increase in fixed assets 232,400 233,700 208,900
Depreciation 186,500 181,600 157,600
BK and TB      
Business segment information      
Net revenue: 2,152,800 2,566,000 2,150,600
Net interest income 1,756,900 1,616,900 1,854,600
Net fees 954,000 885,400 736,500
Other (558,100) 63,700 (440,500)
Other than BK and TB      
Business segment information      
Net revenue: 2,657,700 2,186,600 2,365,200
Operating Segments | Customer business      
Business segment information      
Net revenue: 5,113,300 4,412,400 4,107,500
Operating expenses 2,853,700 2,519,100 2,487,900
Operating profit (loss) 2,259,600 1,893,300 1,619,600
Fixed assets: 813,100 778,400 731,600
Increase in fixed assets 167,300 176,200 154,700
Depreciation 143,200 136,500 109,000
Operating Segments | Customer business | BK and TB      
Business segment information      
Net revenue: 2,704,000 2,448,800 2,000,300
Net interest income 1,569,600 1,380,300 1,051,000
Net fees 995,300 923,500 809,600
Other 139,100 145,000 139,700
Operating Segments | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 2,409,300 1,963,600 2,107,200
Operating Segments | Retail & Digital Business Group | Customer business      
Business segment information      
Net revenue: 944,600 845,000 817,400
Operating expenses 667,600 628,800 607,200
Operating profit (loss) 277,000 216,200 210,200
Fixed assets: 267,500 243,800 215,200
Increase in fixed assets 50,300 49,800 50,400
Depreciation 33,000 23,300 15,300
Operating Segments | Retail & Digital Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 390,800 319,400 312,700
Net interest income 307,400 248,100 242,500
Net fees 79,400 67,800 66,400
Other 4,000 3,500 3,800
Operating Segments | Retail & Digital Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 553,800 525,600 504,700
Operating Segments | Commercial Banking & Wealth Management Business Group | Customer business      
Business segment information      
Net revenue: 726,600 626,800 545,200
Operating expenses 429,700 408,000 379,100
Operating profit (loss) 296,900 218,800 166,100
Fixed assets: 187,800 171,500 160,500
Increase in fixed assets 37,200 35,800 31,100
Depreciation 21,000 19,000 14,500
Operating Segments | Commercial Banking & Wealth Management Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 499,000 420,300 369,300
Net interest income 266,400 197,800 160,200
Net fees 196,700 189,100 175,000
Other 35,900 33,400 34,100
Operating Segments | Commercial Banking & Wealth Management Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 227,600 206,500 175,900
Operating Segments | Japanese Corporate & Investment Banking Business Group | Customer business      
Business segment information      
Net revenue: 1,025,600 975,600 800,900
Operating expenses 386,600 369,200 330,700
Operating profit (loss) 639,000 606,400 470,200
Fixed assets: 171,700 169,300 163,900
Increase in fixed assets 45,000 46,100 37,700
Depreciation 42,200 42,500 37,500
Operating Segments | Japanese Corporate & Investment Banking Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 836,100 795,600 645,500
Net interest income 514,400 490,600 342,500
Net fees 255,200 234,500 228,600
Other 66,500 70,500 74,400
Operating Segments | Japanese Corporate & Investment Banking Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 189,500 180,000 155,400
Operating Segments | Global Commercial Banking Business Group | Customer business      
Business segment information      
Net revenue: 969,300 684,800 870,600
Operating expenses 531,200 382,200 580,300
Operating profit (loss) 438,100 302,600 290,300
Fixed assets: 2,100 1,600 1,300
Increase in fixed assets 600 500 600
Depreciation 300 300 200
Operating Segments | Global Commercial Banking Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 27,000 29,100 35,100
Net interest income 28,000 29,300 35,700
Net fees 0 0 0
Other (1,000) (200) (600)
Operating Segments | Global Commercial Banking Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 942,300 655,700 835,500
Operating Segments | Asset Management & Investor Services Business Group | Customer business      
Business segment information      
Net revenue: 534,200 432,300 360,800
Operating expenses 398,700 311,000 255,800
Operating profit (loss) 135,500 121,300 105,000
Fixed assets: 23,100 21,300 18,800
Increase in fixed assets 7,700 11,500 11,500
Depreciation 7,600 9,100 6,000
Operating Segments | Asset Management & Investor Services Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 139,300 118,600 105,400
Net interest income 25,800 14,700 9,400
Net fees 113,500 103,800 96,000
Other 0 100 0
Operating Segments | Asset Management & Investor Services Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 394,900 313,700 255,400
Operating Segments | Global Corporate & Investment Banking Business Group | Customer business      
Business segment information      
Net revenue: 913,000 847,900 712,600
Operating expenses 439,900 419,900 334,800
Operating profit (loss) 473,100 428,000 377,800
Fixed assets: 160,900 170,900 171,900
Increase in fixed assets 26,500 32,500 23,400
Depreciation 39,100 42,300 35,500
Operating Segments | Global Corporate & Investment Banking Business Group | Customer business | BK and TB      
Business segment information      
Net revenue: 811,800 765,800 532,300
Net interest income 427,600 399,800 260,700
Net fees 350,500 328,300 243,600
Other 33,700 37,700 28,000
Operating Segments | Global Corporate & Investment Banking Business Group | Customer business | Other than BK and TB      
Business segment information      
Net revenue: 101,200 82,100 180,300
Operating Segments | Global Markets Business Group      
Business segment information      
Net revenue: (330,600) 311,000 409,100
Operating expenses 318,100 297,400 274,000
Operating profit (loss) (648,700) 13,600 135,100
Fixed assets: 87,800 114,300 113,100
Increase in fixed assets 25,500 28,200 23,400
Depreciation 30,300 32,800 28,500
Operating Segments | Global Markets Business Group | BK and TB      
Business segment information      
Net revenue: (619,800) 14,800 130,800
Net interest income 100,500 106,300 710,600
Net fees (24,800) (13,300) (16,600)
Other (695,500) (78,200) (563,200)
Operating Segments | Global Markets Business Group | Other than BK and TB      
Business segment information      
Net revenue: 289,200 296,200 278,300
Other      
Business segment information      
Net revenue: 27,800 29,200 (800)
Operating expenses 73,000 104,700 176,500
Operating profit (loss) (45,200) (75,500) (177,300)
Fixed assets: 482,300 502,300 523,400
Increase in fixed assets 39,600 29,300 30,800
Depreciation 13,000 12,300 20,100
Other | Subsidiaries      
Business segment information      
Fixed assets: 1,732,500 1,505,400 1,210,200
Other | BK and TB      
Business segment information      
Net revenue: 68,600 102,400 19,500
Net interest income 86,800 130,300 93,000
Net fees (16,500) (24,800) (56,500)
Other (1,700) (3,100) (17,000)
Other | Other than BK and TB      
Business segment information      
Net revenue: ¥ (40,800) ¥ (73,200) ¥ (20,300)