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Right-of-use assets - Summary of right of use assets (Detail) - 12 months ended Mar. 31, 2020
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation ₨ 5,911  
Ending balance 16,748 $ 222
Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 17,095  
Additions 4,949  
Additions through Business combinations 364  
Disposals (147)  
Translation adjustment 428  
Ending balance 22,689  
Gross carrying amount [member] | Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 2,003  
Ending balance 2,003  
Gross carrying amount [member] | Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 11,502  
Additions 3,520  
Additions through Business combinations 364  
Disposals (41)  
Translation adjustment 279  
Ending balance 15,624  
Gross carrying amount [member] | Plant and machinery [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 2,941  
Additions [1] 1,210  
Disposals [1] (47)  
Translation adjustment [1] 132  
Ending balance [1] 4,236  
Gross carrying amount [member] | Vehicles [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 649  
Additions 219  
Disposals (59)  
Translation adjustment 17  
Ending balance 826  
Accumulated depreciation and amortisation [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Disposals (75)  
Depreciation 5,911  
Translation adjustment 105  
Ending balance 5,941  
Accumulated depreciation and amortisation [member] | Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation 27  
Ending balance 27  
Accumulated depreciation and amortisation [member] | Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Disposals (18)  
Depreciation 3,884  
Translation adjustment 62  
Ending balance 3,928  
Accumulated depreciation and amortisation [member] | Plant and machinery [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Disposals [1] (47)  
Depreciation [1] 1,731  
Translation adjustment [1] 37  
Ending balance [1] 1,721  
Accumulated depreciation and amortisation [member] | Vehicles [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Disposals (10)  
Depreciation 269  
Translation adjustment 6  
Ending balance ₨ 265  
[1] Includes computer equipment.