v3.26.1
Stockholders' equity - Summary of Changes in Accumulated Other Comprehensive Income by Item Explanatory (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance ¥ (566,447)    
Transactions with noncontrolling interests shareholders and other 36,286 ¥ 143,363 ¥ 109,064
Ending Balance 1,229,371 (566,447)  
Changes in equity instruments measured at fair value through other comprehensive income [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (58,315) (75,292) (9,152)
Other comprehensive income attributable to Sony Group Corporation's stockholders (21,201) (12,531) (53,814)
Transfer to retained earnings (91) 29,508 (12,326)
Transfer to held for distribution to owners 4,747    
Ending Balance (74,860) (58,315) (75,292)
Changes in debt instruments measured at fair value through other comprehensive income [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (1,346,306) (664,791) 39,845
Other comprehensive income attributable to Sony Group Corporation's stockholders (262,844) (681,515) (704,636)
Transfer to held for distribution to owners 1,609,300    
Ending Balance 150 (1,346,306) (664,791)
Cash flow hedges [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance 15,470 19,765 18,413
Other comprehensive income attributable to Sony Group Corporation's stockholders (3,384) (4,295) 1,352
Ending Balance 12,086 15,470 19,765
Remeasurement of defined benefit pension plans [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Other comprehensive income attributable to Sony Group Corporation's stockholders 38,184 10,583 25,875
Transfer to retained earnings (38,184) (10,583) (25,875)
Exchange differences on translating foreign operations [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance 873,514 952,693 513,203
Other comprehensive income attributable to Sony Group Corporation's stockholders 423,701 (79,179) 439,490
Transactions with noncontrolling interests shareholders and other 5,207    
Ending Balance 1,302,422 873,514 952,693
Insurance finance income (expenses) [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (60,685) (620,238) (1,183,634)
Other comprehensive income attributable to Sony Group Corporation's stockholders 228,593 568,291 563,396
Transfer to retained earnings   (8,738)  
Transfer to held for distribution to owners (167,908)    
Ending Balance   (60,685) (620,238)
Share of other comprehensive income of investments accounted for using the equity method [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance 10,642 11,891 6,563
Other comprehensive income attributable to Sony Group Corporation's stockholders (21,039) (1,248) 5,348
Transfer to retained earnings (30) (1) (20)
Ending Balance (10,427) 10,642 11,891
Other [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (767) (91) 192
Other comprehensive income attributable to Sony Group Corporation's stockholders (206) (676) (283)
Transfer to held for distribution to owners 973    
Ending Balance   (767) (91)
Accumulated other comprehensive income [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (566,447) (376,063) (614,570)
Other comprehensive income attributable to Sony Group Corporation's stockholders 381,804 (200,570) 276,728
Transfer to retained earnings (38,305) 10,186 (38,221)
Transactions with noncontrolling interests shareholders and other 5,207    
Transfer to held for distribution to owners 1,447,112    
Ending Balance ¥ 1,229,371 ¥ (566,447) ¥ (376,063)