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Investments in Associates - Insurance and reinsurance associates and joint ventures (Details)
₨ / shares in Units, $ in Millions, ₨ in Billions
12 Months Ended
Oct. 30, 2024
USD ($)
May 23, 2024
USD ($)
May 22, 2024
Dec. 26, 2023
Dec. 25, 2023
Dec. 31, 2024
₨ / shares
Dec. 31, 2023
May 23, 2024
INR (₨)
₨ / shares
Go Digit Infoworks Services Private Limited | Go Digit Insurance Limited                
Investments in Associates                
Ownership percentage   73.60% 83.30%          
Go Digit Infoworks Services Private Limited                
Investments in Associates                
Ownership percentage           49.00%    
Insurance and reinsurance companies | Go Digit Insurance Limited                
Investments in Associates                
Ownership percentage   49.00%            
Dividend received | $ $ 112.3              
Insurance and reinsurance companies | Go Digit Infoworks Services Private Limited                
Investments in Associates                
Ownership percentage           49.00% 49.00%  
Insurance and reinsurance companies | Gulf Insurance                
Investments in Associates                
Ownership percentage       90.00% 43.70%      
Go Digit Insurance Limited                
Investments in Associates                
Fair value of investments in associates for which there are quoted market prices   $ 3,000.0           ₨ 249.5
Market price per share (associate) | ₨ / shares               ₨ 272
Pre tax gain | $   $ 106.3            
Market value (per common share) | ₨ / shares           ₨ 319.1