Basis of Financial Statements and Summary of Significant Accounting Policies - Adjustments Condensed Consolidated Statements of Cash Flows (Details) - JPY (¥)
¥ in Millions |
12 Months Ended |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
| Cash flows from operating activities: |
|
|
|
| Net income before attribution of noncontrolling interests |
¥ 1,267,638
|
¥ 1,377,569
|
¥ 414,561
|
| Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities: |
|
|
|
| Depreciation and amortization |
383,408
|
368,561
|
348,938
|
| Provision for credit losses (Note 4) |
121,790
|
258,795
|
7,285
|
| Employee benefit cost (income) for severance indemnities and pension plans |
(63,046)
|
(26,771)
|
45,710
|
| Investment securities (gains) losses—net |
832,533
|
(1,382,458)
|
256,941
|
| Amortization of premiums (discounts) on investment securities |
(94,981)
|
(44,064)
|
51,451
|
| Foreign exchange (gains) losses—net |
(730,529)
|
534,351
|
(546,496)
|
| Equity in earnings of equity method investees—net |
(669,400)
|
(464,054)
|
(398,147)
|
| Provision (benefit) for deferred income tax expense |
167,781
|
91,212
|
(407,242)
|
| Increase in trading account assets, excluding foreign exchange contracts |
(5,752,205)
|
(3,047,277)
|
(180,520)
|
| Increase in trading account liabilities, excluding foreign exchange contracts |
4,282,380
|
2,101,271
|
2,729,112
|
| Net decrease (increase) in collateral for derivative transactions |
568,191
|
(461,210)
|
696,093
|
| Other—net |
(296,704)
|
(1,262,107)
|
830,835
|
| Net cash provided by (used in) operating activities |
1,028,836
|
(1,791,585)
|
2,013,322
|
| Cash flows from investing activities: |
|
|
|
| Proceeds from sales of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
53,000,461
|
62,450,011
|
56,578,311
|
| Proceeds from maturities of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
46,068,373
|
31,969,733
|
32,854,833
|
| Purchases of Available-for-sale debt securities (including purchases of debt securities under the fair value option) |
(101,306,253)
|
(87,816,718)
|
(81,002,626)
|
| Proceeds from maturities of Held-to-maturity debt securities |
5,845,448
|
1,380,753
|
124,997
|
| Purchases of Held-to-maturity debt securities |
(4,329,574)
|
(3,889,987)
|
(16,973,690)
|
| Proceeds from sales and redemption of Equity securities (including proceeds from equity securities under the fair value option) |
4,106,446
|
3,148,971
|
2,858,308
|
| Purchases of Equity securities (including purchases of equity securities under the fair value option) |
(3,085,879)
|
(2,894,534)
|
(1,913,227)
|
| Net increase in loans |
(3,620,030)
|
(1,565,920)
|
(1,402,980)
|
| Net decrease (increase) in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions |
348,469
|
(3,758,551)
|
(1,113,515)
|
| Proceeds from sales of premises and equipment |
46,977
|
55,625
|
35,623
|
| Capital expenditures for premises and equipment |
(131,724)
|
(111,213)
|
(119,391)
|
| Purchases of intangible assets |
(306,656)
|
(317,308)
|
(273,092)
|
| Other—net |
6,608
|
73,762
|
(31,766)
|
| Net cash used in investing activities |
(3,336,616)
|
(1,252,841)
|
(11,950,290)
|
| Cash flows from financing activities: |
|
|
|
| Net increase in deposits |
2,227,431
|
4,134,276
|
6,141,360
|
| Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions |
6,796,160
|
(6,079,068)
|
11,540,490
|
| Net increase (decrease) in due to trust account and other short-term borrowings |
12,379,688
|
822,146
|
(8,467,520)
|
| Proceeds from issuance of long-term debt |
3,829,535
|
3,210,761
|
7,570,238
|
| Repayments of long-term debt |
(22,910,590)
|
(3,956,044)
|
(4,188,643)
|
| Dividends paid by subsidiaries to noncontrolling interests |
(29,138)
|
(25,767)
|
(18,789)
|
| Other—net |
51,976
|
(39,579)
|
55,089
|
| Net cash provided by (used in) financing activities |
1,405,813
|
(2,768,754)
|
11,803,571
|
| Effect of exchange rate changes on cash and cash equivalents |
81,442
|
1,980,471
|
1,042,438
|
| Net increase (decrease) in cash and cash equivalents |
(820,525)
|
(3,832,709)
|
2,909,041
|
| Cash and cash equivalents at beginning of fiscal year |
110,124,736
|
113,957,445
|
111,048,404
|
| Cash and cash equivalents: |
|
|
|
| Cash, due from banks and interest-earning deposits in other banks |
109,298,114
|
110,118,623
|
113,953,858
|
| Cash and cash equivalents at end of fiscal year |
109,304,211
|
110,124,736
|
113,957,445
|
| Cash paid during the fiscal year for: |
|
|
|
| Interest |
5,190,245
|
4,377,677
|
1,953,620
|
| Income taxes, net of refunds |
328,966
|
519,958
|
451,993
|
| Non-cash investing and financing activities: |
|
|
|
| Assets acquired under finance lease arrangements (Note 7) |
4,657
|
15,987
|
11,203
|
| Assets acquired under operating lease arrangements (Note 7) |
40,608
|
51,764
|
36,218
|
| HC Indonesia |
|
|
|
| Cash flows from investing activities: |
|
|
|
| Payments to acquire businesses, net of cash acquired |
0
|
(29,219)
|
0
|
| Acquisition of PT Home Credit Indonesia, a subsidiary of BK |
|
|
|
| Fair value of assets acquired, excluding cash and cash equivalents |
0
|
59,619
|
0
|
| As Previously Reported |
|
|
|
| Cash flows from operating activities: |
|
|
|
| Net income before attribution of noncontrolling interests |
|
1,381,027
|
407,048
|
| Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities: |
|
|
|
| Depreciation and amortization |
|
368,145
|
348,173
|
| Provision for credit losses (Note 4) |
|
237,990
|
8,148
|
| Employee benefit cost (income) for severance indemnities and pension plans |
|
(27,001)
|
47,740
|
| Investment securities (gains) losses—net |
|
(1,379,550)
|
254,178
|
| Amortization of premiums (discounts) on investment securities |
|
(43,874)
|
51,514
|
| Foreign exchange (gains) losses—net |
|
511,334
|
(508,644)
|
| Equity in earnings of equity method investees—net |
|
(463,802)
|
(398,086)
|
| Provision (benefit) for deferred income tax expense |
|
93,123
|
(410,275)
|
| Increase in trading account assets, excluding foreign exchange contracts |
|
(3,046,474)
|
(184,246)
|
| Increase in trading account liabilities, excluding foreign exchange contracts |
|
2,094,319
|
2,740,193
|
| Net decrease (increase) in collateral for derivative transactions |
|
(437,941)
|
713,541
|
| Other—net |
|
(942,166)
|
872,051
|
| Net cash provided by (used in) operating activities |
|
(1,490,273)
|
2,106,136
|
| Cash flows from investing activities: |
|
|
|
| Proceeds from sales of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
|
62,450,314
|
56,577,840
|
| Proceeds from maturities of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
|
31,987,266
|
32,907,726
|
| Purchases of Available-for-sale debt securities (including purchases of debt securities under the fair value option) |
|
(87,806,011)
|
(81,038,628)
|
| Proceeds from maturities of Held-to-maturity debt securities |
|
1,380,753
|
127,815
|
| Purchases of Held-to-maturity debt securities |
|
(3,889,987)
|
(16,975,528)
|
| Proceeds from sales and redemption of Equity securities (including proceeds from equity securities under the fair value option) |
|
3,146,236
|
2,857,748
|
| Purchases of Equity securities (including purchases of equity securities under the fair value option) |
|
(2,893,370)
|
(1,912,280)
|
| Net increase in loans |
|
(1,709,541)
|
(1,496,724)
|
| Net decrease (increase) in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions |
|
(3,646,170)
|
(1,297,909)
|
| Proceeds from sales of premises and equipment |
|
57,728
|
32,214
|
| Capital expenditures for premises and equipment |
|
(113,716)
|
(116,367)
|
| Purchases of intangible assets |
|
(315,146)
|
(272,534)
|
| Other—net |
|
60,247
|
(34,917)
|
| Net cash used in investing activities |
|
(1,268,560)
|
(12,213,619)
|
| Cash flows from financing activities: |
|
|
|
| Net increase in deposits |
|
3,659,260
|
6,207,093
|
| Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions |
|
(6,039,816)
|
11,656,491
|
| Net increase (decrease) in due to trust account and other short-term borrowings |
|
804,718
|
(8,456,081)
|
| Proceeds from issuance of long-term debt |
|
3,188,412
|
7,529,772
|
| Repayments of long-term debt |
|
(3,962,569)
|
(4,168,619)
|
| Dividends paid by subsidiaries to noncontrolling interests |
|
(25,738)
|
(18,784)
|
| Other—net |
|
(39,223)
|
55,059
|
| Net cash provided by (used in) financing activities |
|
(3,250,435)
|
11,976,277
|
| Effect of exchange rate changes on cash and cash equivalents |
|
1,994,454
|
1,063,752
|
| Net increase (decrease) in cash and cash equivalents |
|
(4,014,814)
|
2,932,546
|
| Cash and cash equivalents at beginning of fiscal year |
110,029,276
|
114,044,090
|
111,111,544
|
| Cash and cash equivalents: |
|
|
|
| Cash, due from banks and interest-earning deposits in other banks |
|
110,023,163
|
114,040,503
|
| Cash and cash equivalents at end of fiscal year |
|
110,029,276
|
114,044,090
|
| Cash paid during the fiscal year for: |
|
|
|
| Interest |
|
4,363,668
|
1,942,163
|
| Income taxes, net of refunds |
|
520,859
|
453,869
|
| Non-cash investing and financing activities: |
|
|
|
| Assets acquired under finance lease arrangements (Note 7) |
|
16,174
|
11,066
|
| Assets acquired under operating lease arrangements (Note 7) |
|
50,996
|
35,678
|
| As Previously Reported | HC Indonesia |
|
|
|
| Cash flows from investing activities: |
|
|
|
| Payments to acquire businesses, net of cash acquired |
|
(28,917)
|
0
|
| Acquisition of PT Home Credit Indonesia, a subsidiary of BK |
|
|
|
| Fair value of assets acquired, excluding cash and cash equivalents |
|
59,317
|
0
|
| Adjustments |
|
|
|
| Cash flows from operating activities: |
|
|
|
| Net income before attribution of noncontrolling interests |
|
(3,458)
|
7,513
|
| Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities: |
|
|
|
| Depreciation and amortization |
|
416
|
765
|
| Provision for credit losses (Note 4) |
|
20,805
|
(863)
|
| Employee benefit cost (income) for severance indemnities and pension plans |
|
230
|
(2,030)
|
| Investment securities (gains) losses—net |
|
(2,908)
|
2,763
|
| Amortization of premiums (discounts) on investment securities |
|
(190)
|
(63)
|
| Foreign exchange (gains) losses—net |
|
23,017
|
(37,852)
|
| Equity in earnings of equity method investees—net |
|
(252)
|
(61)
|
| Provision (benefit) for deferred income tax expense |
|
(1,911)
|
3,033
|
| Increase in trading account assets, excluding foreign exchange contracts |
|
(803)
|
3,726
|
| Increase in trading account liabilities, excluding foreign exchange contracts |
|
6,952
|
(11,081)
|
| Net decrease (increase) in collateral for derivative transactions |
|
(23,269)
|
(17,448)
|
| Other—net |
|
(319,941)
|
(41,216)
|
| Net cash provided by (used in) operating activities |
|
(301,312)
|
(92,814)
|
| Cash flows from investing activities: |
|
|
|
| Proceeds from sales of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
|
(303)
|
471
|
| Proceeds from maturities of Available-for-sale debt securities (including proceeds from debt securities under the fair value option) |
|
(17,533)
|
(52,893)
|
| Purchases of Available-for-sale debt securities (including purchases of debt securities under the fair value option) |
|
(10,707)
|
36,002
|
| Proceeds from maturities of Held-to-maturity debt securities |
|
0
|
(2,818)
|
| Purchases of Held-to-maturity debt securities |
|
0
|
1,838
|
| Proceeds from sales and redemption of Equity securities (including proceeds from equity securities under the fair value option) |
|
2,735
|
560
|
| Purchases of Equity securities (including purchases of equity securities under the fair value option) |
|
(1,164)
|
(947)
|
| Net increase in loans |
|
143,621
|
93,744
|
| Net decrease (increase) in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions |
|
(112,381)
|
184,394
|
| Proceeds from sales of premises and equipment |
|
(2,103)
|
3,409
|
| Capital expenditures for premises and equipment |
|
2,503
|
(3,024)
|
| Purchases of intangible assets |
|
(2,162)
|
(558)
|
| Other—net |
|
13,515
|
3,151
|
| Net cash used in investing activities |
|
15,719
|
263,329
|
| Cash flows from financing activities: |
|
|
|
| Net increase in deposits |
|
475,016
|
(65,733)
|
| Net increase (decrease) in call money, funds purchased, and payables under repurchase agreements and securities lending transactions |
|
(39,252)
|
(116,001)
|
| Net increase (decrease) in due to trust account and other short-term borrowings |
|
17,428
|
(11,439)
|
| Proceeds from issuance of long-term debt |
|
22,349
|
40,466
|
| Repayments of long-term debt |
|
6,525
|
(20,024)
|
| Dividends paid by subsidiaries to noncontrolling interests |
|
(29)
|
(5)
|
| Other—net |
|
(356)
|
30
|
| Net cash provided by (used in) financing activities |
|
481,681
|
(172,706)
|
| Effect of exchange rate changes on cash and cash equivalents |
|
(13,983)
|
(21,314)
|
| Net increase (decrease) in cash and cash equivalents |
|
182,105
|
(23,505)
|
| Cash and cash equivalents at beginning of fiscal year |
¥ 95,460
|
(86,645)
|
(63,140)
|
| Cash and cash equivalents: |
|
|
|
| Cash, due from banks and interest-earning deposits in other banks |
|
95,460
|
(86,645)
|
| Cash and cash equivalents at end of fiscal year |
|
95,460
|
(86,645)
|
| Cash paid during the fiscal year for: |
|
|
|
| Interest |
|
14,009
|
11,457
|
| Income taxes, net of refunds |
|
(901)
|
(1,876)
|
| Non-cash investing and financing activities: |
|
|
|
| Assets acquired under finance lease arrangements (Note 7) |
|
(187)
|
137
|
| Assets acquired under operating lease arrangements (Note 7) |
|
768
|
540
|
| Adjustments | HC Indonesia |
|
|
|
| Cash flows from investing activities: |
|
|
|
| Payments to acquire businesses, net of cash acquired |
|
(302)
|
0
|
| Acquisition of PT Home Credit Indonesia, a subsidiary of BK |
|
|
|
| Fair value of assets acquired, excluding cash and cash equivalents |
|
¥ 302
|
¥ 0
|