v3.25.2
Insurance contracts in the financial services segment - Summary of Changes in insurance contract liabilities from insurance contracts not measured under the PAA by measurement component (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Changes that relate to future service    
Effect of contracts initially recognized during the period ¥ 1,768 ¥ 2,116
Total changes that relate to future service 101,865 149,241
Changes that relate to current service    
Total changes that relate to current service (151,025) (151,841)
Insurance finance expenses (income) 30,155 57,995
Cash flows    
Other (1,334) 76
Estimates of present value of future cash flows [member]    
Changes that relate to future service    
Effect of contracts initially recognized during the period 2,391,895 2,268,072
Risk adjustment for non-financial risk [member]    
Changes that relate to future service    
Effect of contracts initially recognized during the period 44,335 40,912
CSM [member]    
Changes that relate to future service    
Effect of contracts initially recognized during the period 389,234 364,328
Insurance contracts not measured under PAA [member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, Beginning (56,975) (60,751)
Insurance contract liabilities, Beginning 12,986,833 12,411,184
Net amounts, Beginning 12,929,858 12,350,433
Changes that relate to future service    
Changes in estimates that do not adjust the CSM 12,508 2,476
Effect of contracts initially recognized during the period 1,768 2,116
Total changes that relate to future service 14,276 4,592
Changes that relate to current service    
CSM recognized in profit or loss for the services provided (151,025) (151,841)
Change in risk adjustment for non-financial risk due to release of risk (28,681) (26,899)
Experience adjustments 656 5,076
Total changes that relate to current service (179,050) (173,664)
Changes that relate to past service   253
Insurance service result (164,774) (168,819)
Insurance finance expenses (income) (633,829) 247,205
Total amounts recognized in comprehensive income (798,603) 78,386
Cash flows    
Premiums received 1,894,792 1,748,139
Insurance acquisition cash flows (151,614) (138,544)
Claims and other insurance service expenses paid (1,179,036) (1,107,850)
Total cash flows 564,142 501,745
Other 2,192 (706)
Insurance contract assets, Ending (47,715) (56,975)
Insurance contracts liabilities, Ending 12,745,304 12,986,833
Net amounts, Ending 12,697,589 12,929,858
Insurance contracts not measured under PAA [member] | Estimates of present value of future cash flows [member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, Beginning (291,878) (341,096)
Insurance contract liabilities, Beginning 10,697,166 10,217,895
Net amounts, Beginning 10,405,288 9,876,799
Changes that relate to future service    
Changes in estimates that adjust the CSM 276,707 233,415
Changes in estimates that do not adjust the CSM 11,762 6,008
Effect of contracts initially recognized during the period (431,801) (403,124)
Total changes that relate to future service (143,332) (163,701)
Changes that relate to current service    
Experience adjustments 656 5,076
Total changes that relate to current service 656 5,076
Changes that relate to past service 6 255
Insurance service result (142,670) (158,370)
Insurance finance expenses (income) (661,734) 185,948
Total amounts recognized in comprehensive income (804,404) 27,578
Cash flows    
Premiums received 1,894,792 1,748,139
Insurance acquisition cash flows (151,614) (138,544)
Claims and other insurance service expenses paid (1,179,036) (1,107,850)
Total cash flows 564,142 501,745
Other 2,883 (834)
Insurance contract assets, Ending (245,602) (291,878)
Insurance contracts liabilities, Ending 10,413,511 10,697,166
Net amounts, Ending 10,167,909 10,405,288
Insurance contracts not measured under PAA [member] | Risk adjustment for non-financial risk [member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, Beginning 27,824 39,067
Insurance contract liabilities, Beginning 388,658 381,950
Net amounts, Beginning 416,482 421,017
Changes that relate to future service    
Changes in estimates that adjust the CSM 10,662 (18,328)
Changes in estimates that do not adjust the CSM 746 (3,532)
Effect of contracts initially recognized during the period 44,335 40,912
Total changes that relate to future service 55,743 19,052
Changes that relate to current service    
Change in risk adjustment for non-financial risk due to release of risk (28,681) (26,899)
Total changes that relate to current service (28,681) (26,899)
Changes that relate to past service (6) (2)
Insurance service result 27,056 (7,849)
Insurance finance expenses (income) (2,250) 3,262
Total amounts recognized in comprehensive income 24,806 (4,587)
Cash flows    
Other 643 52
Insurance contract assets, Ending 24,501 27,824
Insurance contracts liabilities, Ending 417,430 388,658
Net amounts, Ending 441,931 416,482
Insurance contracts not measured under PAA [member] | CSM [member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, Beginning 207,079 241,278
Insurance contract liabilities, Beginning 1,901,009 1,811,339
Net amounts, Beginning 2,108,088 2,052,617
Changes that relate to future service    
Changes in estimates that adjust the CSM (287,369) (215,087)
Effect of contracts initially recognized during the period 389,234 364,328
Total changes that relate to future service 101,865 149,241
Changes that relate to current service    
CSM recognized in profit or loss for the services provided (151,025) (151,841)
Total changes that relate to current service (151,025) (151,841)
Insurance service result (49,160) (2,600)
Insurance finance expenses (income) 30,155 57,995
Total amounts recognized in comprehensive income (19,005) 55,395
Cash flows    
Other (1,334) 76
Insurance contract assets, Ending 173,386 207,079
Insurance contracts liabilities, Ending 1,914,363 1,901,009
Net amounts, Ending ¥ 2,087,749 ¥ 2,108,088