v3.26.1
Condensed Financial Information of Registrant (SMFG) - Condensed Statement of Cash Flows (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Operating Activities:      
Profit before tax ¥ 1,555,030 ¥ 654,246 ¥ 1,207,789
Income taxes paid—net (578,988) (493,128) (200,183)
Other operating activities—net (796,114) 1,578,664 83,657
Net cash and cash equivalents provided by (used in) operating activities (6,461,096) 3,066,127 1,036,630
Investing Activities:      
Investments in associates and joint ventures (343,504) (36,164) (350,938)
Other investing activities—net   (4) (4)
Net cash and cash equivalents provided by (used in) investing activities 2,760,051 (4,530,784) (816,554)
Financing Activities:      
Proceeds from issuance of other equity instruments 468,762 409,972 698,552
Dividends paid to shareholders (540,071) (412,120) (348,010)
Coupons paid to other equity instruments holders (49,868) (31,636) (13,763)
Purchases of treasury stock and proceeds from sales of treasury stock—net (250,365) (251,448) (211,217)
Net cash and cash equivalents provided by (used in) financing activities (191,020) (612,300) 166,184
Payments for the principal portion of lease liabilities (88,758) (96,737) (94,574)
Net increase (decrease) of cash and cash equivalents (2,612,902) (2,187,682) 2,093,571
Cash and cash equivalents at beginning of period 75,250,124 77,437,806 75,344,235
Cash and cash equivalents at end of period 72,637,222 75,250,124 77,437,806
Sumitomo Mitsui Banking Corporation and Other Subsidiaries [Member]      
Investing Activities:      
Loans provided to subsidiaries (1,365,996) (490,827) (1,269,130)
SMFG [member]      
Operating Activities:      
Profit before tax 964,377 993,839 559,195
Income taxes paid—net 14,021 32,052 78,036
Other operating activities—net (17,214) (34,924) 63,260
Net cash and cash equivalents provided by (used in) operating activities 961,184 990,967 700,491
Investing Activities:      
Investments in subsidiaries (3,559) (93,679) (377,437)
Investments in associates and joint ventures   (507) (26,962)
Other investing activities—net (5,961) (4,697) (5,995)
Net cash and cash equivalents provided by (used in) investing activities (1,375,516) (589,710) (1,679,524)
Financing Activities:      
Net increase (decrease) of short-term borrowings from SMBC (4,650) (28,000) 220,000
Proceeds from issuance of long-term borrowings 3,198   1,263,169
Redemption of long-term borrowings (8,000) (13,000) (1,259,255)
Proceeds from issuance of debt securities 2,142,650 1,403,275 1,260,767
Proceeds from issuance of other equity instruments 466,383 407,939 694,862
Redemption of debt securities (1,238,587) (1,255,520) (564,970)
Redemption of other equity instruments (85,000)    
Dividends paid to shareholders (540,071) (412,120) (348,010)
Coupons paid to other equity instruments holders (49,868) (31,636) (13,763)
Purchases of treasury stock and proceeds from sales of treasury stock—net (250,365) (251,448) (211,218)
Net cash and cash equivalents provided by (used in) financing activities 435,389 (180,510) 1,041,582
Payments for the principal portion of lease liabilities (301)    
Net increase (decrease) of cash and cash equivalents 21,057 220,747 62,549
Cash and cash equivalents at beginning of period 530,273 309,526 246,977
Cash and cash equivalents at end of period ¥ 551,330 ¥ 530,273 ¥ 309,526