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Changes in Accumulated Other Comprehensive Income After Tax (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance ₨ 2,163,404.8   ₨ 1,896,493.8
Net unrealized gain/(loss) arising during the period (34,791.1)   (1,873.4)
Amounts reclassified to income (10,187.7)   (23,271.9)
Balance 2,509,453.4 $ 33,075.7 2,163,404.8
Available for Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 25,212.9   49,225.4
Net unrealized gain/(loss) arising during the period (36,088.6)   (740.6)
Amounts reclassified to income (10,187.7)   (23,271.9)
Balance (21,063.4) (277.6) 25,212.9
Foreign Currency Translation Reserve      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 1,973.4   3,106.2
Net unrealized gain/(loss) arising during the period 1,297.5   (1,132.8)
Amounts reclassified to income 0.0   0.0
Balance 3,270.9 43.1 1,973.4
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 27,186.3   52,331.6
Balance ₨ (17,792.5) $ (234.5) ₨ 27,186.3