v3.25.2
Stockholders' equity - Summary of Changes in Accumulated Other Comprehensive Income by Item Explanatory (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance ¥ (376,063)    
Ending Balance (566,447) ¥ (376,063)  
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 (75,292) (9,152) ¥ 27,412
Other comprehensive income attributable to Sony Group Corporation's stockholders (12,531) (53,814) (36,862)
Transfer to retained earnings 29,508 (12,326) 298
Ending Balance (58,315) (75,292) (9,152)
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 (664,791) 39,845 859,037
Other comprehensive income attributable to Sony Group Corporation's stockholders (681,515) (704,636) (819,192)
Ending Balance (1,346,306) (664,791) 39,845
Cash flow hedges [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance 19,765 18,413 6,034
Other comprehensive income attributable to Sony Group Corporation's stockholders (4,295) 1,352 12,379
Ending Balance 15,470 19,765 18,413
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 10,583 25,875 18,891
Transfer to retained earnings (10,583) (25,875) (18,891)
Exchange differences on translating foreign operations [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance 952,693 513,203 337,678
Other comprehensive income attributable to Sony Group Corporation's stockholders (79,179) 439,490 175,525
Ending Balance 873,514 952,693 513,203
Insurance finance income (expenses) [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (620,238) (1,183,634) (1,911,350)
Other comprehensive income attributable to Sony Group Corporation's stockholders 568,291 563,396 727,716
Transfer to retained earnings (8,738)    
Ending Balance (60,685) (620,238) (1,183,634)
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 11,891 6,563 2,864
Other comprehensive income attributable to Sony Group Corporation's stockholders (1,248) 5,348 3,699
Transfer to retained earnings (1) (20)  
Ending Balance 10,642 11,891 6,563
Other [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (91) 192 336
Other comprehensive income attributable to Sony Group Corporation's stockholders (676) (283) (144)
Ending Balance (767) (91) 192
Accumulated other comprehensive income [member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning Balance (376,063) (614,570) (677,989)
Other comprehensive income attributable to Sony Group Corporation's stockholders (200,570) 276,728 82,012
Transfer to retained earnings 10,186 (38,221) (18,593)
Ending Balance ¥ (566,447) ¥ (376,063) ¥ (614,570)