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Income Taxes - Movement in Deferred Tax Assets and Liabilities (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance ₨ 2,187 ₨ 3,849 ₨ (3,516)
Credit/(charge) in the consolidated statement of income (475) (1,592) 3,944
Credit/(charge) in other comprehensive income 1,645 (616) 1,573
On account of business combination (177)   (113)
Assets held for sale     1,961
Other (if any)   546  
Ending balance 3,180 2,187 3,849
Carry forward losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 3,149 5,694 5,513
Credit/(charge) in the consolidated statement of income (1,287) (2,879) 133
Credit/(charge) in other comprehensive income 182 334 48
Ending balance 2,044 3,149 5,694
Trade payables, accrued expenses and other liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 3,713 3,107 3,151
Credit/(charge) in the consolidated statement of income 1,033 295 243
Credit/(charge) in other comprehensive income 248 (22) (246)
Assets held for sale     (41)
Other (if any)   333  
Ending balance 4,994 3,713 3,107
Allowances for lifetime expected credit loss [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 4,521 4,499 2,955
Credit/(charge) in the consolidated statement of income (591) 9 1,564
Credit/(charge) in other comprehensive income (9) 2 2
Assets held for sale     (22)
Other (if any)   11  
Ending balance 3,921 4,521 4,499
Minimum alternate tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance   74 1,520
Credit/(charge) in the consolidated statement of income 3,425 (74) (1,446)
Ending balance 3,425   74
Property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,840) (2,166) (4,153)
Credit/(charge) in the consolidated statement of income 1,150 219 912
Credit/(charge) in other comprehensive income 4 (94) (75)
Assets held for sale     1,150
Other (if any)   201  
Ending balance (686) (1,840) (2,166)
Amortizable goodwill [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,899) (1,810) (4,057)
Credit/(charge) in the consolidated statement of income (92) 16 1,522
Credit/(charge) in other comprehensive income (175) (105) (53)
Assets held for sale     778
Ending balance (2,166) (1,899) (1,810)
Intangible assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (2,295) (3,190) (4,511)
Credit/(charge) in the consolidated statement of income 1,021 1,076 1,546
Credit/(charge) in other comprehensive income (90) (181) (112)
On account of business combination (177)   (113)
Ending balance (1,541) (2,295) (3,190)
Interest income and fair value movement of investments [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,455) (1,712) (2,245)
Credit/(charge) in the consolidated statement of income 599 186 (112)
Credit/(charge) in other comprehensive income 230 71 645
Ending balance (626) (1,455) (1,712)
Cash flow hedges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (604) 29 (1,419)
Credit/(charge) in other comprehensive income 1,165 (633) 1,448
Ending balance 561 (604) 29
Contract liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (289) (273) (183)
Credit/(charge) in the consolidated statement of income 285 (1) (35)
Credit/(charge) in other comprehensive income (7) (15) (9)
Assets held for sale     (46)
Ending balance (11) (289) (273)
SEZ Re-investment Reserve [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,132)    
Credit/(charge) in the consolidated statement of income (5,482) (1,132)  
Ending balance (6,614) (1,132)  
Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 318 (403) (87)
Credit/(charge) in the consolidated statement of income (536) 693 (383)
Credit/(charge) in other comprehensive income 97 27 (75)
Assets held for sale     142
Other (if any)   1  
Ending balance ₨ (121) ₨ 318 ₨ (403)