v3.26.1
Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance ₨ 80,684    
Capital work-in-progress 4,563 [1]   ₨ 2,211
Ending balance 81,787 $ 872 80,684
Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 183,756   179,693
Additions 12,711   20,934
Additions through Business combinations (Refer to Note 7) 362   9
Disposals (17,971)   (16,959)
Translation adjustment 4,071   79
Ending balance 182,929   183,756
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 105,283   105,565
Depreciation and impairment 14,595   15,568
Disposals (17,368)   (15,863)
Translation adjustment 3,195   13
Ending balance 105,705   105,283
Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 78,473    
Ending balance 77,224   78,473
Land [member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,373   4,375
Additions 0   0
Additions through Business combinations (Refer to Note 7) 0   0
Disposals 0   (6)
Translation adjustment 31   4
Ending balance 4,404   4,373
Land [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 0   0
Depreciation and impairment 0   0
Disposals 0   0
Translation adjustment 0   0
Ending balance 0   0
Land [member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,373    
Ending balance 4,404   4,373
Buildings [member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 52,556   47,024
Additions 923   6,215
Additions through Business combinations (Refer to Note 7) 131   0
Disposals (821)   (680)
Translation adjustment 440   (3)
Ending balance 53,229   52,556
Buildings [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 12,997   11,775
Depreciation and impairment 1,848   1,662
Disposals (695)   (410)
Translation adjustment 211   (30)
Ending balance 14,361   12,997
Buildings [member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 39,559    
Ending balance 38,868   39,559
Plant and equipment [member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance [2] 99,554   102,513
Additions [2] 9,253   10,623
Additions through Business combinations (Refer to Note 7) [2] 109   9
Disposals [2] (14,979)   (13,668)
Translation adjustment [2] 3,182   77
Ending balance [2] 97,119   99,554
Plant and equipment [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance [2] 73,459   75,549
Depreciation and impairment [2] 9,669   11,050
Disposals [2] (14,730)   (13,189)
Translation adjustment [2] 2,670   49
Ending balance [2] 71,068   73,459
Plant and equipment [member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance [2] 26,095    
Ending balance [2] 26,051   26,095
Furniture and fixtures [member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 19,576   18,233
Additions 1,795   3,143
Additions through Business combinations (Refer to Note 7) 22   0
Disposals (1,449)   (1,803)
Translation adjustment 270   3
Ending balance 20,214   19,576
Furniture and fixtures [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 12,989   12,287
Depreciation and impairment 2,387   2,229
Disposals (1,245)   (1,526)
Translation adjustment 197   (1)
Ending balance 14,328   12,989
Furniture and fixtures [member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,587    
Ending balance 5,886   6,587
Office Equipment [Member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 7,663   7,514
Additions 737   943
Additions through Business combinations (Refer to Note 7) 99   0
Disposals (720)   (793)
Translation adjustment 147   (1)
Ending balance 7,926   7,663
Office Equipment [Member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,821   5,932
Depreciation and impairment 686   623
Disposals (697)   (730)
Translation adjustment 116   (4)
Ending balance 5,926   5,821
Office Equipment [Member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,842    
Ending balance 2,000   1,842
Vehicles [member] | Gross carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 34   34
Additions 3   10
Additions through Business combinations (Refer to Note 7) 1   0
Disposals (2)   (9)
Translation adjustment 1   (1)
Ending balance 37   34
Vehicles [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 17   22
Depreciation and impairment 5   4
Disposals (1)   (8)
Translation adjustment 1   (1)
Ending balance 22   17
Vehicles [member] | Net carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 17    
Ending balance ₨ 15   ₨ 17
[1] Including capital advance of ₹ 15 and Capital work-in-progress of ₹ 6 on account of additions through business combination.(Refer to Note 7)
[2] Including net carrying value of computer equipment and software amounting to ₹ 16,003 and ₹ 16,719, as at March 31, 2025 and 2026, respectively.