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Changes in Accumulated Other Comprehensive Income After Tax (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance ₨ 2,917,837.9   ₨ 2,509,453.4
Net unrealized gain/ (loss) arising during the period 78,846.4   (49,144.3)
Amounts reclassified to income 4,856.3   (1,336.9)
Long-duration insurance contract discount rate change (34,112.6)    
Transferred to undistributed policyholders earnings account 3,391.4    
Net change (15,292.2)    
Less: Other comprehensive income attributable to shareholders of noncontrolling interest 248.2    
Balance 7,886,182.8 $ 94,626.7 2,917,837.9
AFS debt Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (74,923.1)   (21,063.4)
Net unrealized gain/ (loss) arising during the period 78,036.1   (52,522.8)
Amounts reclassified to income 4,856.3   (1,336.9)
Long-duration insurance contract discount rate change 0.0    
Transferred to undistributed policyholders earnings account 0.0    
Net change 7,969.3    
Less: Other comprehensive income attributable to shareholders of noncontrolling interest 15,474.5    
Balance (7,505.2) (90.1) (74,923.1)
Foreign Currency Translation Reserve      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 6,649.4   3,270.9
Net unrealized gain/ (loss) arising during the period 810.3   3,378.5
Amounts reclassified to income 0.0   0.0
Long-duration insurance contract discount rate change 0.0    
Transferred to undistributed policyholders earnings account 0.0    
Net change 7,459.7    
Less: Other comprehensive income attributable to shareholders of noncontrolling interest 17.9    
Balance 7,441.8 89.3 6,649.4
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (68,273.7)   (17,792.5)
Balance (15,540.4) (186.5) (68,273.7)
Long-Duration Insurance Contract      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 0.0    
Net unrealized gain/ (loss) arising during the period 0.0    
Amounts reclassified to income 0.0    
Long-duration insurance contract discount rate change (34,112.6)    
Transferred to undistributed policyholders earnings account 3,391.4    
Net change (30,721.2)    
Less: Other comprehensive income attributable to shareholders of noncontrolling interest (15,244.2)    
Balance ₨ (15,477.0) $ (185.7) ₨ 0.0