TATACOMM2021-01-012021-03-31in-bse-fin:OneOperatingExpenses01Member TATACOMM2021-01-012021-03-31in-bse-fin:OneOperatingExpenses02Member TATACOMM2021-01-012021-03-31in-bse-fin:FourOperatingExpenses01Member TATACOMM2021-01-012021-03-31in-bse-fin:FourOperatingExpenses02Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentRevenue01Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentRevenue02Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentRevenue03Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentRevenue01Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentRevenue02Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentRevenue03Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentResults01Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentResults02Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentResults03Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentResults01Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentResults02Member TATACOMM2021-01-012021-03-31in-bse-fin:FourReportableSegmentResults03Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentAssets01Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentAssets02Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentAssets03Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentLiabilities01Member TATACOMM2021-03-31in-bse-fin:OneReportableSegmentLiabilities01Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentLiabilities02Member TATACOMM2021-03-31in-bse-fin:OneReportableSegmentLiabilities02Member TATACOMM2021-01-012021-03-31in-bse-fin:OneReportableSegmentLiabilities03Member TATACOMM2021-03-31in-bse-fin:OneReportableSegmentLiabilities03Member iso4217:INRxbrli:purexbrli:sharesiso4217:INRxbrli:shares TATACOMM 2020-04-01 2021-03-31 2021-04-21 INR Lakhs Yearly true Cash Flow Indirect Multi segment 2021-01-01 2021-03-31 Unaudited Standalone 15783400000.00 425300000.00 16208700000.00 0.00 0.00 0.00 2777300000.00 232700000.00 2690500000.00 8038600000.00 13739100000.00 2469600000.00 194400000.00 2664000000.00 325100000.00 245500000.00 570600000.00 0.00 2093400000.00 0.00 0.00 0.00 0.00 2093400000.00 39900000.00 2133300000.00 0.00 0.00 2850000000.00 10 7.34 7.34 0.00 0.00 7.34 7.34 0.00 Multi segment 2020-04-01 2021-03-31 Audited Standalone 62253200000.00 2745600000.00 64998800000.00 0.00 0.00 0.00 11046100000.00 1067300000.00 9728900000.00 31371700000.00 53214000000.00 11784800000.00 508200000.00 12293000000.00 2869200000.00 -202800000.00 2666400000.00 0.00 9626600000.00 0.00 0.00 0.00 0.00 9626600000.00 -27300000.00 9599300000.00 0.00 0.00 2850000000.00 10 85754700000.00 33.78 33.78 0.00 0.00 33.78 33.78 0.00 Network and transmission 4792700000.00 Operating and other expenses 3245900000.00 Network and transmission 19207400000.00 Operating and other expenses 12164300000.00 Data and Managed Services 15096600000.00 Real Estate 440000000.00 Voice Solutions 246800000.00 Data and Managed Services 58904300000.00 Real Estate 1688700000.00 Voice Solutions 1660200000.00 15783400000.00 62253200000.00 0.00 0.00 15783400000.00 62253200000.00 Data and Managed Services 2276400000.00 Real Estate 306600000.00 Voice Solutions -306000000.00 Data and Managed Services 11682700000.00 Real Estate 1097600000.00 Voice Solutions -2673800000.00 2277000000.00 10106500000.00 232700000.00 1067300000.00 -619700000.00 -3253800000.00 2664000000.00 12293000000.00 Data and Managed Services 60830800000.00 Real Estate 4210300000.00 Voice Solutions 1009300000.00 66050400000.00 75926500000.00 141976900000.00 Data and Managed Services 33946900000.00 Real Estate 856500000.00 Voice Solutions 1471800000.00 36275200000.00 15036400000.00 51311600000.00 1067300000.00 467500000.00 1723900000.00 0.00 338700000.00 0.00 0.00 0.00 0.00 -594600000.00 0.00 -3112900000.00 0.00 9728900000.00 0.00 -100000000.00 0.00 0.00 0.00 -102700000.00 1010900000.00 159800000.00 0.00 -392200000.00 0.00 4800000.00 0.00 -136800000.00 0.00 7721200000.00 20014200000.00 0.00 0.00 0.00 3539800000.00 0.00 16474400000.00 0.00 0.00 53216200000.00 59807100000.00 0.00 0.00 0.00 0.00 35000000.00 8707100000.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1010900000.00 127800000.00 0.00 -418600000.00 0.00 -14542900000.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6669700000.00 6220300000.00 0.00 688800000.00 1140000000.00 206600000.00 0.00 0.00 -1586000000.00 345500000.00 0.00 345500000.00 1629500000.00 1975000000.00