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Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance ₨ 64,443    
Capital work-in-progress 22,773   ₨ 15,680
Assets reclassified as held for sale     (514)
Ending balance 70,601 $ 1,021 64,443
Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 132,915   156,542
Translation adjustment 594   1,387
Additions 15,106   15,745
Acquisition through business combinations     29
Disposals (7,609)   (8,658)
Assets reclassified as held for sale     (32,130)
Ending balance 141,006   132,915
Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 83,638   95,699
Translation adjustment 331   662
Depreciation 14,999   16,869
Disposals (5,790)   (7,710)
Assets reclassified as held for sale     (21,882)
Ending balance 93,178   83,638
Land [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,637   3,814
Translation adjustment (5)   28
Additions 65   2
Assets reclassified as held for sale     (207)
Ending balance 3,697   3,637
Buildings [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 25,145   27,581
Translation adjustment (8)   265
Additions 2,684   1,197
Acquisition through business combinations     13
Disposals (331)   (190)
Assets reclassified as held for sale     (3,721)
Ending balance 27,490   25,145
Buildings [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,824   6,361
Translation adjustment 8   49
Depreciation 1,034   1,023
Disposals (151)   (70)
Assets reclassified as held for sale     (1,539)
Ending balance 6,715   5,824
Plant and machinery [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 87,222   108,967
Translation adjustment 613   904
Additions 10,402   11,767
Acquisition through business combinations     4
Disposals (5,871)   (7,302)
Assets reclassified as held for sale     (27,118)
Ending balance 92,366   87,222
Plant and machinery [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 65,325   77,005
Translation adjustment 332   509
Depreciation 12,298   14,078
Disposals (4,767)   (6,640)
Assets reclassified as held for sale     (19,627)
Ending balance 73,188   65,325
Furniture fixtures and equipment [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 15,772   15,748
Translation adjustment     188
Additions 1,951   1,776
Acquisition through business combinations     11
Disposals (1,218)   (872)
Assets reclassified as held for sale     (1,079)
Ending balance 16,505   15,772
Furniture fixtures and equipment [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,983   11,968
Translation adjustment (6)   104
Depreciation 1,363   1,381
Disposals (747)   (758)
Assets reclassified as held for sale     (712)
Ending balance 12,593   11,983
Vehicles [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,139   432
Translation adjustment (6)   2
Additions 4   1,003
Acquisition through business combinations     1
Disposals (189)   (294)
Assets reclassified as held for sale     (5)
Ending balance 948   1,139
Vehicles [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 506   365
Translation adjustment (3)    
Depreciation 304   387
Disposals (125)   (242)
Assets reclassified as held for sale     (4)
Ending balance ₨ 682   ₨ 506