Tata Motors (TTM) 20-F 30 Jul 19 2019 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Mar. 31, 2019shares
Document information [line items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	TTM
Entity Registrant Name	TATA MOTORS LTD/FI
Entity Central Index Key	0000926042
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Security 12(b) Title	Ordinary Shares, par value Rs.2 per share
Security Exchange Name	NYSE
Entity Address Country	IN
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Ordinary shares [Member]
Document information [line items]
Entity Common Stock, Shares Outstanding	2,887,348,694
'A' Ordinary shares [Member]
Document information [line items]
Entity Common Stock, Shares Outstanding	508,502,371

Consolidated Balance Sheets

Consolidated Balance Sheets ₨ in Millions, $ in Millions		Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Current assets:
Cash and cash equivalents		₨ 215,598	$ 3,117.6	₨ 147,167.5
Short-term deposits		105,742.1	1,529.1	193,615.7
Finance receivables		115,515.2	1,670.4	84,016.5
Trade receivables		189,961.7	2,746.9	198,933
Investments		89,383.3	1,292.5	146,637.5
Other financial assets		49,970.7	722.6	58,443.6
Inventories		390,015.9	5,639.7	424,296.2
Other current assets		68,622.2	992.3	76,625.5
Current income tax assets		1,843.7	26.7	2,087.4
Investments in equity accounted investees (held for sale)				4,973.5
Assets classified as held for sale		1,622.4	23.5	25,851.9
Total current assets		1,228,275.2	17,761.3	1,362,648.3
Non-current assets:
Finance receivables		220,731.7	3,191.8	154,973.2
Investments		14,975.1	216.8	7,576.5
Other financial assets		32,166	465.1	50,592.8
Property, plant and equipment		762,303.3	11,023.1	850,444.1
Goodwill		7,478.7	108.1	1,164.5
Intangible assets		580,555.9	8,395	685,167.9
Investments in equity accounted investees		53,348.8	771.4	48,878.9
Non-current income tax assets		10,245.6	148.2	8,999
Deferred income taxes		51,511.1	744.9	41,064.6
Other non-current assets		25,528.5	369.1	24,001.1
Total non-current assets		1,758,844.7	25,433.5	1,872,862.6
Total assets		2,987,119.9	43,194.8	3,235,510.9
Current liabilities:
Accounts payable		759,681.7	10,985.2	804,601.6
Acceptances		31,771.2	459.5	49,013.4
Short-term borrowings and current portion of long-term debt		351,843.7	5,087.8	277,287.4
Other financial liabilities		103,669.2	1,499.1	119,118.6
Provisions		101,967.5	1,474.5	79,418.5
Other current liabilities		88,640.9	1,281.8	72,050.7
Current income tax liabilities		10,176.4	147.2	15,590.7
Liabilities directly associated with assets classified as held for sale				10,701.8
Total current liabilities		1,447,750.6	20,935.1	1,427,782.7
Non-current liabilities:
Long-term debt		708,067	10,238.8	611,419.4
Other financial liabilities		29,488.8	426.4	27,887.4
Deferred income taxes		14,910.4	215.6	61,257.8
Provisions		118,548.5	1,714.2	109,493.3
Other liabilities		110,287.2	1,594.8	84,149.3
Total non-current liabilities		981,301.9	14,189.8	894,207.2
Total liabilities		2,429,052.5	35,124.9	2,321,989.9
Equity:
Additional paid-in capital		261,387.8	3,779.7	261,303.4
Reserves	[1]	317,926.7	4,597.4	632,954.1
Other components of equity		(33,368)	(482.5)	7,113.8
Equity attributable to shareholders of Tata Motors Limited		552,738.7	7,992.8	908,163.5
Non-controlling interests		5,328.7	77.1	5,357.5
Total equity		558,067.4	8,069.9	913,521
Total liabilities and equity		2,987,119.9	43,194.8	3,235,510.9
Ordinary shares [Member]
Equity:
Ordinary shares		5,775.2	83.5	5,775.2
'A' Ordinary shares [Member]
Equity:
Ordinary shares		₨ 1,017	$ 14.7	₨ 1,017
[1]	Includes other comprehensive income relating to assets classified as held for sale amounting to Rs.Nil million and Rs. 125.9 million as at March 31, 2019 and 2018 respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Statement of financial position [abstract]
Other comprehensive income relating to assets classified as held for sale	₨ 0	₨ 125.9

Consolidated Income Statements

Consolidated Income Statements ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)₨ / shares	Mar. 31, 2019USD ($)$ / shares	Mar. 31, 2018INR (₨)₨ / shares	Mar. 31, 2017INR (₨)₨ / shares
Statement [line items]
Revenues	₨ 2,959,666.9	$ 42,797.6	₨ 2,856,910.8	₨ 2,632,176.8
Finance revenues	33,995.5	491.6	26,040.3	24,318.3
Total revenues	2,993,662.4	43,289.2	2,882,951.1	2,656,495.1
Change in inventories of finished goods and work-in-progress	20,532.8	296.9	(20,465.8)	(73,751.2)
Purchase of products for sale	132,588.3	1,917.3	159,039.9	139,245.3
Raw materials, components, and consumables	1,809,875.4	26,171.3	1,718,028	1,593,803.1
Employee cost	346,261.1	5,007	302,624.8	283,588
Defined benefit pension plan amendment cost/(credit)	1,479.3	21.4	(36,090.1)
Depreciation and amortization	230,197.8	3,328.7	209,818.2	182,405.4
Other expenses	657,298.7	9,504.7	629,755.4	608,461.6
Reversal for loss of inventory (net of insurance recoveries)			(111.9)	(13,301)
Expenditure capitalized	(196,595.6)	(2,842.8)	(185,882)	(168,768.8)
Assets written off / loss on sale of assets and others (net)	13,186.7	190.7	29,148.6	11,418.6
Other (income)/loss (net)	(35,438.7)	(512.5)	(47,873.3)	(39,590.1)
Foreign exchange (gain)/loss (net)	5,824.2	84.2	4,332.9	16,590.4
Interest income	(7,864.6)	(113.7)	(7,122.4)	(5,640.7)
Interest expense (net)	57,586	832.7	46,791.3	42,365.7
Share of (profit)/loss of equity accounted investees (net)	(2,095)	(30.3)	(22,782.6)	(14,930)
Net income/(loss) before tax	(317,553.1)	(4,591.8)	103,740.1	94,598.8
Income tax (expense)/credit	25,425	367.7	(37,678.2)	(35,035.6)
Net income/(loss)	(292,128.1)	(4,224.1)	66,061.9	59,563.2
Attributable to:
Shareholders of Tata Motors Limited	(293,142.7)	(4,238.8)	65,040.7	58,539.3
Non-controlling interests	1,014.6	14.7	₨ 1,021.2	₨ 1,023.9
Jaguar Land Rover Limited [Member]
Statement [line items]
Provision for impairment in Jaguar Land Rover	₨ 278,379.1	$ 4,025.4
Ordinary shares [Member]
Earnings per share:
Basic | (per share)	₨ (86.3)	$ (1.2)	₨ 19.1	₨ 17.2
Diluted | (per share)	(86.3)	(1.2)	19.1	17.2
'A' Ordinary shares [Member]
Earnings per share:
Basic | (per share)	(86.3)	(1.2)	19.2	17.3
Diluted | (per share)	₨ (86.3)	$ (1.2)	₨ 19.2	₨ 17.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Statement of comprehensive income [abstract]
Net income/(loss)	₨ (292,128.1)	$ (4,224.1)	₨ 66,061.9	₨ 59,563.2
(i) Items that will not be reclassified subsequently to profit and loss :
Remeasurement gains and (losses) on defined benefit obligations (net)	(25,612.6)	(370.4)	46,751	(78,045)
Share of remeasurement gains and (losses) on defined benefit obligations (net) of equity accounted investees	33.8	0.5	(47.5)	(40)
Unrealized gains / (losses) on investments (net)	355.4	5.1
Share of unrealized gains / (losses) on investments (net) of equity accounted investees	77.7	1.1
Gains and (losses) in cash flow hedges of forecast inventory purchases (refer note 2(x))	18,134.5	262.2
Income tax relating to items that will not be reclassified subsequently (refer note 2(x))	756.9	10.9	(7,613.9)	12,407.4
Items that will not be reclassified subsequently to profit and loss	(6,254.3)	(90.6)	39,089.6	(65,677.6)
(ii) Items that may be reclassified subsequently to profit and loss :
Currency translation	(20,413.2)	(295.2)	96,484.5	(94,148)
Gain/(loss) on cash flow hedges (net)	(28,142.8)	(407)	208,629.8	(154,141.7)
Available-for-sale investments			399.6	752.6
Share of other comprehensive income of equity accounted investees (net)	(586.1)	(8.5)	4,044.2	(3,047)
Income tax relating to items that may be reclassified subsequently	5,319.9	76.9	(39,450)	28,664.5
Items that may be reclassified subsequently to profit and loss	(43,822.2)	(633.8)	270,108.1	(221,919.6)
Other comprehensive income/(loss) for the year, net of tax (i+ii)	(50,076.5)	(724.4)	309,197.7	(287,597.2)
Total comprehensive income/(loss) for the year	(342,204.6)	(4,948.5)	375,259.6	(228,034)
Attributable to:
Shareholders of Tata Motors Limited	(343,213.4)	(4,963.1)	373,966.5	(228,715.6)
Non-controlling interests	₨ 1,008.8	$ 14.6	₨ 1,293.1	₨ 681.6

Consolidated Statements of Cash

Consolidated Statements of Cash Flows ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Cash flows from operating activities:
Net income/(loss)	₨ (292,128.1)	$ (4,224.1)	₨ 66,061.9	₨ 59,563.2
Adjustments for:
Depreciation and amortization expense	230,197.8	3,328.7	209,818.2	182,405.4
Inventory write-down/(reversals)	6,086.3	88	6,074.2	(4,579.1)
Allowances for finance receivables	3,202.4	46.3	255.2	5,653.5
Defined benefit pension plan amendment cost/(credit)	1,479.3	21.4	(36,090.1)
Provision for employee separation cost	13,672.2	197.7
Allowances for trade and other receivables	2,141.9	31	145.7	1,706
Impairment of Goodwill	81.1	1.2		142.5
Share of (profit)/loss of equity accounted investees (net)	(2,095)	(30.3)	(22,782.6)	(14,930)
Loss on sale of assets/assets written off and others (net)	13,186.7	190.7	23,825.5	11,418.6
(Gain) on sale/loss on fair valuation of available-for-sale investments (net)			(1,561.7)	(1,826)
Marked-to-market on investments measured at fair value through profit or loss	(2,385.4)	(34.5)
Profit on sale of investments (net)	(1,286.1)	(18.6)
Profit on sale of investment in a subsidiary company	(3,769.8)	(54.5)
(Gain)/Loss on change in fair value of commodity derivatives	3,120	45.1	170.9	(12,973.4)
Fair value gain on disposal of joint venture			(190.6)
Foreign exchange (gain)/loss (net)	5,046.7	73	4,247.6	(9,534.9)
Income tax expense/(credit)	(25,425)	(367.7)	37,678.2	35,035.6
Interest expense	57,586	832.7	46,791.3	42,365.7
Interest income	(7,864.6)	(113.7)	(7,122.4)	(5,640.7)
Dividend income and income on mutual funds	(172.8)	(2.5)	(157.7)	(105.1)
Gain on fair value of below market interest loans	(133.7)	(1.9)	(60.2)	(465.2)
Cash flows from operating activities before changes in following assets and liabilities	278,837.9	4,032.2	327,103.4	288,236.1
Trade receivables	9,547	138.1	(43,265.8)	(23,677.8)
Finance receivables	(100,637.9)	(1,455.3)	(63,612.2)	(17,916.3)
Other financial assets	2,301.3	33.3	(33,730.5)	(1,193.2)
Other current assets	6,905.2	99.9	1,820	(7,700.4)
Inventories	20,686.4	299.1	(35,604.3)	(66,309.4)
Other non-current assets	(3,956.4)	(57.2)	(307.6)	(4,292)
Accounts payable	(26,810.7)	(387.7)	72,565.7	84,935.1
Acceptances	(17,244.5)	(249.4)	631	8,527.3
Other current liabilities	19,807	286.4	5,631.7	7,854
Other financial liabilities	(300.1)	(4.3)	15,419.8	7,651.3
Other non-current liabilities	29,848.8	431.6	(46,878.3)	16,348.7
Provisions	(3,482.1)	(50.4)	69,012.9	29,594.9
Cash generated from operations	215,501.8	3,116.3	268,785.8	322,058.3
Income tax paid (net)	(26,594.3)	(384.6)	(30,211.6)	(18,951)
Net cash provided by operating activities	188,907.5	2,731.7	238,574.2	303,107.3
Cash flows from investing activities:
Deposits with banks/financial institutions	(235,663.6)	(3,407.8)	(478,682.9)	(447,429.4)
Realization of deposits with banks / financial institutions	328,523.9	4,750.5	523,438	334,465.5
(Purchase)/sale of mutual funds, money market funds and equity shares (net)	56,390.2	815.4	23,610.9	19,143.8
Proceeds from sale of investment in a subsidiary company	5,329.6	77.1
Purchases of available-for-sale investments			(3,287.8)	(63.6)
Investments in others	(1,300.1)	(18.8)
Proceeds from sale of available-for-sale investments			194.3	506.1
Proceeds from sale of investments in other companies	51.8	0.7
Excess of cash acquired on acquisition of subsidiary company			144.5
Deposits of margin money and other restricted deposits	(7,647.1)	(110.6)	(3,917.6)	(4,192.5)
Realization of margin money and other restricted deposits	4,902	70.9	2,134	7,862.2
Deposits with financial institution	(5,000.3)	(72.3)
(Increase)/decrease in short term inter-corporate deposits	(19.8)	(0.3)		300
Loan to joint venture	(37.5)	(0.5)
Loan to others	(34.2)	(0.5)		(97.8)
Repayment of loan by others				7.5
Repayments of loan by joint operation				1,325
Investments in equity accounted investees	(93.1)	(1.3)	(42.1)	(1,069.5)
Dividends received from equity accounted investees	2,149.8	31.1	17,816.4	6,091.9
Interest received	7,605.2	110	6,904.7	6,381.8
Dividend received	172.8	2.5	157.7	105.1
Payments for property, plant and equipment	(174,195.5)	(2,518.9)	(198,654.3)	(162,798.7)
Proceeds from sale of property, plant and equipment	672.3	9.7	303	533.9
Payments for intangible assets	(178,839.7)	(2,586.1)	(152,134.9)	(143,798.9)
Payments for purchase of minority stake in a subsidiary company	(77.6)	(1.1)
Net cash used in investing activities	(197,110.9)	(2,850.3)	(262,016.1)	(382,727.6)
Cash flows from financing activities:
Proceeds from issuance of shares				45.5
Proceeds from issuance of shares to non-controlling interests shareholders				6.2
Dividends paid (including dividend distribution tax)				(730)
Dividends paid to non-controlling interests shareholders of subsidiaries (including dividend distribution tax)	(947.4)	(13.7)	(959.6)	(482.2)
Interest paid	(68,404)	(989.2)	(54,106.4)	(52,223.8)
Proceeds from issuance of short-term debt	201,191.4	2,909.3	150,087.3	150,052.6
Repayment of short-term debt	(218,521.3)	(3,159.9)	(193,766.2)	(117,537.1)
Net change in other short-term debt (with maturity up to three months)	49,139	710.6	73,282.4	(7,662.5)
Proceeds from issuance of long-term debt	261,013.1	3,774.3	152,108.8	183,845.2
Repayments of long-term debt	(133,458.9)	(1,929.9)	(105,872.5)	(92,121.3)
Debt issuance cost	(1,708.2)	(24.7)	(656.7)	(1,139.6)
Net cash provided by financing activities	88,303.7	1,276.8	20,117.1	62,053
Net change in cash and cash equivalents	80,100.3	1,158.2	(3,324.8)	(17,567.3)
Reversal of / (classified as) held for sale	2,439.4	35.3	(2,439.4)
Effect of foreign exchange on cash and cash equivalents	(14,109.2)	(204)	13,064.1	(14,101.2)
Cash and cash equivalents, beginning of the year	147,167.5	2,128.1	139,867.6	171,536.1
Cash and cash equivalents, end of the year	215,598	3,117.6	147,167.5	139,867.6
Non-cash transactions:
Liability towards property, plant and equipment and intangible assets purchased on credit/deferred credit	72,863.2	1,053.6	83,465.4	₨ 33,463.5
Increase/(decrease) in liabilities arising from financing activities on account of non-cash transactions:
Exchange differences	11,201.5	162	27,680.3
Classified as held for sale			(1,425.5)
Amortization of prepaid discounting charges	1,581.9	22.9	₨ 2,027
Jaguar Land Rover Limited [Member]
Adjustments for:
Provision for impairment in Jaguar Land Rover	₨ 278,379.1	$ 4,025.4

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical)	12 Months Ended
	Mar. 31, 2018INR (₨)
Top of range [member]
Statement [line items]
Proceeds from issuance of shares	₨ 50,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity ₨ in Millions, $ in Millions		INR (₨)	USD ($)	IFRS9 [member]INR (₨)	IFRS 15 [member]INR (₨)	Share capital [Member]INR (₨)	Share capital [Member]USD ($)	Additional paid-in capital [Member]INR (₨)	Additional paid-in capital [Member]USD ($)	Share Based Payment Reserve [member]INR (₨)	Share Based Payment Reserve [member]USD ($)	Currency translation reserve [Member]INR (₨)	Currency translation reserve [Member]USD ($)	Available-for-sale investments [Member]INR (₨)	Available-for-sale investments [Member]USD ($)	Available-for-sale investments [Member]IFRS9 [member]INR (₨)	Equity Instruments Through Other Comprehensive Income [member]INR (₨)	Equity Instruments Through Other Comprehensive Income [member]USD ($)	Equity Instruments Through Other Comprehensive Income [member]IFRS9 [member]INR (₨)	Share Based Payment Other Reserve [member]INR (₨)	Share Based Payment Other Reserve [member]USD ($)	Hedging reserve [Member]INR (₨)	Hedging reserve [Member]USD ($)	Hedging reserve [Member]IFRS9 [member]INR (₨)	Cost Of Hedging Reserve [member]INR (₨)	Cost Of Hedging Reserve [member]USD ($)	Cost Of Hedging Reserve [member]IFRS9 [member]INR (₨)	Other components of equity [Member]INR (₨)	Other components of equity [Member]USD ($)	Capital redemption reserve [Member]INR (₨)	Capital redemption reserve [Member]USD ($)	Debenture redemption reserve [Member]INR (₨)	Debenture redemption reserve [Member]USD ($)	Reserve for research and human resource development [Member]INR (₨)	Reserve for research and human resource development [Member]USD ($)	Special reserve [Member]INR (₨)	Special reserve [Member]USD ($)	Earned surplus reserve [Member]INR (₨)	Earned surplus reserve [Member]USD ($)	Retained earnings [Member]INR (₨)	Retained earnings [Member]USD ($)	Retained earnings [Member]IFRS9 [member]INR (₨)	Retained earnings [Member]IFRS 15 [member]INR (₨)	Reserves [Member]INR (₨)	Reserves [Member]USD ($)	Equity attributable to shareholders of Tata Motors Limited [Member]INR (₨)	Equity attributable to shareholders of Tata Motors Limited [Member]USD ($)	Equity attributable to shareholders of Tata Motors Limited [Member]IFRS9 [member]INR (₨)	Equity attributable to shareholders of Tata Motors Limited [Member]IFRS 15 [member]INR (₨)	Non-controlling interests [Member]INR (₨)	Non-controlling interests [Member]USD ($)
Balance at the beginning (Previously stated [member]) at Mar. 31, 2016		₨ 768,036.7				₨ 6,791.8		₨ 261,258.3				₨ 45,936.6		₨ 274.6								₨ (84,860)								₨ 22.8		₨ 10,421.6		₨ 1,644.3		₨ 2,924.5		₨ 235.3		₨ 518,947.3						₨ 763,597.1				₨ 4,439.6
Balance at the beginning (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Mar. 31, 2016																								₨ 659.5			₨ (3,140.5)															₨ 2,481
Balance at the beginning (Adjusted Balance [member]) at Mar. 31, 2016		768,036.7				6,791.8		261,258.3				45,936.6		274.6								(84,200.5)			₨ (3,140.5)					22.8		10,421.6		1,644.3		2,924.5		235.3		521,428.3						763,597.1				4,439.6
Balance at the beginning at Mar. 31, 2016												45,936.6		274.6								(84,860)
Income (loss) for the year		59,563.2																																						58,539.3						58,539.3				1,023.9
Other comprehensive income /(loss) for the year		(287,597.2)										(96,869.8)		788.2								(121,942.8)			(3,564.1)															(65,666.4)						(287,254.9)				(342.3)
Total comprehensive income for the year		(228,034)										(96,869.8)		788.2								(121,942.8)			(3,564.1)															(7,127.1)						(228,715.6)				681.6
Issue of shares held in abeyance		45.5				0.4		45.1																																						45.5
Shares issued to non-controlling interests		6.2																																																6.2
Dividend paid (including dividend tax)		(1,212.2)																																						(730)						(730)				(482.2)
Transfer to debenture redemption reserve																																437.9								(437.9)
Transfer to earned surplus reserve																																						81.8		(81.8)
Balance at the end at Mar. 31, 2017		538,842.2				6,792.2		261,303.4				(50,933.2)		1,062.8								(206,143.3)			(6,704.6)			₨ (262,718.3)		22.8		10,859.5		1,644.3		2,924.5		317.1		513,051.5				₨ 528,819.7		534,197				4,645.2
Income (loss) for the year		66,061.9																																						65,040.7						65,040.7				1,021.2
Other comprehensive income /(loss) for the year		309,197.7										100,322		359.3								166,919.3			2,231.5															39,093.7						308,925.8				271.9
Total comprehensive income for the year		375,259.6										100,322		359.3								166,919.3			2,231.5															104,134.4						373,966.5				1,293.1
Issue of shares held in abeyance	[1]	0				0																																								0
Non-controlling interest on Acquisitions during the period		986.2																																																986.2
Distribution to non-controlling interest		(399.9)																																																(399.9)
Changes to non-controlling interest		(607.4)																																																(607.4)
Dividend paid (including dividend tax)		(559.7)																																																(559.7)
Transfer (from)/to retained earnings																																		349.6		869.7		118.8		(1,338.1)
Balance at the end (Previously stated [member]) at Mar. 31, 2018		913,521				6,792.2		261,303.4				49,388.8		1,422.1								(39,224)			(4,473.1)					22.8		10,859.5		1,993.9		3,794.2		435.9		615,847.8						908,163.5				5,357.5
Balance at the end (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Mar. 31, 2018				₨ (2,792.8)	₨ (418)											₨ (1,422.1)			₨ 1,392.8					₨ (2,819.8)			₨ 204.8															₨ (148.5)	₨ (418)					₨ (2,792.8)	₨ (418)
Balance at the end (Adjusted Balance [member]) at Mar. 31, 2018		910,310.2				6,792.2		261,303.4				49,388.8					₨ 1,392.8					(42,043.8)			(4,268.3)					22.8		10,859.5		1,993.9		3,794.2		435.9		615,281.3						904,952.7				5,357.5
Balance at the end at Mar. 31, 2018		913,521				6,792.2		261,303.4				49,388.8	$ 714.2	₨ 1,422.1	$ 20.6							(39,224)	$ (567.2)		(4,473.1)					22.8		10,859.5		1,993.9		3,794.2		435.9		615,847.8						908,163.5				5,357.5
Income (loss) for the year		(292,128.1)	$ (4,224.1)																																					(293,142.7)						(293,142.7)				1,014.6
Other comprehensive income /(loss) for the year		(50,076.5)	(724.4)									(21,000.2)					442					(8,127.3)			(5.1)															(21,380.1)						(50,070.7)				(5.8)
Total comprehensive income for the year		(342,204.6)	(4,948.5)									(21,000.2)					442					(8,127.3)			(5.1)															(314,522.8)						(343,213.4)				1,008.8
Amounts recognized in inventory		(9,097.6)																				(10,497.1)			1,399.5																					(9,097.6)
Non-controlling interest on Acquisitions during the period		(77.6)																																						12.6						12.6				(90.2)
Realized gain on investments held at fair value through Other comprehensive income																	(49.3)																							49.3
Dividend paid (including dividend tax)		(947.4)																																																(947.4)
Share based payments		84.4								₨ 84.4																																				84.4
Transfer (from)/to retained earnings																																				614		15.9		(629.9)
Balance at the end at Mar. 31, 2019		₨ 558,067.4	$ 8,069.9			₨ 6,792.2	$ 98.2	₨ 261,303.4	$ 3,778.5	₨ 84.4	$ 1.2	₨ 28,388.6	$ 410.5				₨ 1,785.5	$ 25.8		₨ 261,387.8	$ 3,779.7	₨ (60,668.2)	$ (877.2)		₨ (2,873.9)	$ (41.6)		₨ (33,368)	$ (482.5)	₨ 22.8	$ 0.3	₨ 10,859.5	$ 157	₨ 1,993.9	$ 28.8	₨ 4,408.2	$ 64	₨ 451.8	$ 6.5	₨ 300,190.5	$ 4,340.8			₨ 317,926.7	$ 4,597.4	₨ 552,738.7	$ 7,992.8			₨ 5,328.7	$ 77.1
[1]	Less than Rs. 50,000

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Parenthetical) - INR (₨)	12 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Issue of shares held in abeyance	₨ 0	[1]	₨ 45,500,000
Top of range [member]
Issue of shares held in abeyance	₨ 50,000
[1]	Less than Rs. 50,000

Background and operations

Background and operations	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Background and operations	1. Background and operations Tata Motors Limited and its subsidiaries and joint operations, (collectively referred to as “the Company” or “Tata Motors”), designs, manufactures and sells a wide range of automotive vehicles. The Company provides financing for the vehicles sold by dealers of the Company in certain markets. The Company also manufactures engines for industrial and marine applications, aggregates such as axles and transmissions for commercial vehicles and factory automation equipment, and provides information technology services. Tata Motors Limited is a public limited company incorporated and domiciled in India and has its registered office at Mumbai, Maharashtra, India. The Company’s subsidiaries include the Jaguar Land Rover business (referred to as JLR or Jaguar Land Rover). As on March 31, 2019, Tata Sons Private Limited (or Tata Sons), together with its subsidiaries, owns 38.52% of the Ordinary shares and 0.09% of ‘A’ Ordinary shares of Tata Motors Limited, and has the ability to significantly influence the Company’s operations (refer note 27 for voting rights relating to Ordinary shares and ‘A’ Ordinary shares). The consolidated financial statements were approved by the Board of Directors and authorized for issue on July 30, 2019.

Significant accounting policies

Significant accounting policies	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Significant accounting policies	Significant accounting policies a. Statement of compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (referred to as “IFRS”) as issued by the International Accounting Standards Board (referred to as “IASB”). b. Basis of preparation The consolidated financial statements have been prepared on historical cost basis except for certain financial instruments measured at fair value at the end of each reporting period as explained in the accounting policies below. c. Basis of consolidation Subsidiaries The consolidated financial statements include Tata Motors Limited and its subsidiaries. Subsidiaries are entities controlled by the Company. Control exists when the Company (a) has power over the investee, (b) it is exposed, or has rights, to variable returns from its involvement with the investee and (c) has the ability to affect those returns through its power over the investee. The Company reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements listed above. In assessing control, potential voting rights that currently are exercisable are taken into account. The results of subsidiaries acquired or disposed of during the year are included in the consolidated financial statements from the effective date of acquisition and up to the effective date of disposal, as appropriate. Inter-company transactions and balances including unrealized profits are eliminated on consolidation. Non-controlling non-controlling non-controlling acquisition-by-acquisition non-controlling non-controlling non-controlling non-controlling Changes in the Company’s interests in subsidiaries that do not result in a loss of control are accounted for as equity transactions. The carrying amount of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, the profit or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling Financial Instruments Recognition and Measurement Interests in joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint operations Certain of the Company’s activities, are conducted through joint operations, which are joint arrangements whereby the parties that have joint control of the arrangement have rights to the assets, and obligations for the liabilities, relating to the arrangement. The Company recognizes, in the consolidated financial statements, its share of the assets, liabilities, income and expenses of these joint operations incurred jointly with the other partners, along with its share of income from the sale of the output and any assets, liabilities and expenses that it has incurred in relation to the joint operation. Joint ventures A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement have rights to the net assets of the arrangement. The results, assets and liabilities of a joint venture are incorporated in these financial statements using the equity method of accounting as described below. Associates Associates are those entities in which the Company has significant influence. Significant influence is the power to participate in the financial and operating policy decisions of the investee but not control or joint control of those policies. Significant influence is presumed to exist when the Company holds between 20 and 50 percent of the voting power of another entity. The results, assets and liabilities of associates are incorporated in these financial statements using the equity method of accounting as described below. Equity method of accounting (equity accounted investees) An interest in an associate or joint venture is accounted for using the equity method from the date in which the investee becomes an associate or a joint venture and are recognized initially at cost. The Company’s investment includes goodwill identified on acquisition, net of any accumulated impairment losses. The consolidated financial statements include the Company’s share of profits or losses and equity movements of equity accounted investees, from the date that significant influence or joint control commences until the date that significant influence or joint control ceases. When the Company’s share of losses exceeds its interest in an equity accounted investee, the carrying amount of that interest (including any long-term investments in the nature of net investments) is reduced to nil and the recognition of further losses is discontinued except to the extent that the Company has an obligation or has made payments on behalf of the investee. When the Company transacts with an associate or joint venture of the Company, unrealized profits and losses are eliminated to the extent of the Company’s interest in its associate or joint venture. d. Business Combinations Acquisitions of subsidiaries and businesses are accounted for using the acquisition method. Acquisition related costs are recognized in profit or loss as incurred. The acquiree’s identifiable assets, liabilities and contingent liabilities that meet the conditions for recognition are recognized at their fair value at the acquisition date, except certain assets and liabilities required to be measured as per the applicable standard. Purchase consideration in excess of the Company’s interest in the acquiree’s net fair value of identifiable assets, liabilities and contingent liabilities is recognized as goodwill. Excess of the Company’s interest in the net fair value of the acquiree’s identifiable assets, liabilities and contingent liabilities over the purchase consideration is recognized, after reassessment of fair value of net assets acquired, in the income statement. e. Use of estimates and judgments The preparation of financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income, expenses and disclosures of contingent assets and liabilities at the date of these financial statements and the reported amounts of revenues and expenses for the years presented. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed at each balance sheet date. Revisions to accounting estimates are recognized in the period in which the estimate is revised and future periods affected. In particular, information about significant areas of estimation, uncertainty and critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the financial statements are included in the following notes: i) Note 13, 16 and 17 – Property, plant and equipment and intangible assets - useful lives and impairment, capitalization of product development costs ii) Note 15 – Impairment of goodwill iii) Note 17 – Impairment of indefinite life intangible assets iv) Note 19 – Recoverability/recognition of deferred tax assets v) Note 24 – Provision for product warranty vi) Note 35 – Measurement of assets and obligations relating to employee benefits vii) Note 4 – Allowances for credit losses for finance receivables viii) Estimated discounts / incentives required to be paid to dealers on retail of vehicles previously wholesaled f. Revenue recognition The Company generates revenue principally from – a) Sale of products - (i) The Company recognizes revenues on the sale of products, net of discounts, sales incentives, customer bonuses and rebates granted, when products are delivered to dealers or when delivered to a carrier for export sales, which is when control including risks and rewards and title of ownership pass to the customer. Sale of products is presented net of excise duty where applicable and other indirect taxes. The consideration received in respect of transport arrangements for delivering of vehicles to the customers are recognized net of their costs within revenues in the income statement. Revenues are recognized when collectability of the resulting receivable is reasonably assured. b) Sale of services - maintenance service and extended warranties for commercial and passenger vehicles, software support services and insurance broking services. Income from sale of maintenance services and extended warranties, including software services are recognized as income over the relevant period of service or extended warranty. When the Company sells products that are bundled with maintenance service or extended period of warranty, such services are treated as a separate performance obligation only if the service or warranty is optional to the customer or includes an additional service component. In such cases, the transaction price allocated towards such maintenance service or extended period of warranty is recognized as a contract liability until the service obligation has been met. The Company operates certain customer loyalty programs under which customer is entitled to reward points on the spend towards Company’s products. The reward points earned by customers can be redeemed to claim discounts on future purchase of certain products or services. Transaction price allocated towards reward points granted to customers is recognized as a deferred income liability and transferred to income when customers redeem their reward points. For certain sale of services wherein performance obligation is satisfied over a period of time, any amount received in advance is recorded as contract liability and recognized as revenue when service is rendered to customers. Any amount of income accrued but not billed to customers in respect of such contracts is recorded as a contract asset. Such contract assets are transferred to trade receivables on actual billing to customers. Refund liabilities comprise of obligation to customers to pay for discounts and sales incentives. Proceeds from sale of vehicles for which the Company or any of its subsidiaries have retained buy back obligation in future is recorded as a liabilities – (i) Proceeds received in excess of agreed buy back price is recognized as Deferred income liability and (ii) the agreed buy back price is recognized as Buy back liability. Deferred income liability is recognized on a straight line basis over the term of the agreement. c) Financing revenues - Interest income from financing transactions and income from leasing of vehicles to customers. Finance and service charges are accrued on the unpaid principal balance of finance receivables using the effective interest method. d) Refer annual report for the fiscal year ended March 31, 2018 for accounting policies applied by the Company with respect to revenue recognition for fiscal years ended March 31, 2018 and 2017. g. Government grants and incentives Other income includes export and other recurring and non-recurring These are recognized in the consolidated statement of profit and loss, either on a systematic basis when the Company recognises, as expenses, the related costs that the grants are intended to compensate or, immediately if the costs have already been incurred. Government grants related to assets are netted off from the carrying value of related assets. Government grants related to income are presented as an offset against the related expenditure, and government grants that are awarded as incentives with no ongoing performance obligations to the Company are recognized as income in the period in which the grant is received. h. Cost recognition Costs and expenses are recognized when incurred and are classified according to their nature. Expenditure capitalized represents employee costs, stores and other manufacturing supplies, and other expenses incurred for construction including product development undertaken by the Company. i. Provisions A provision is recognized if, as a result of a past event, the Company has a present legal or constructive obligation that can be estimated reliably, and it is probable that an outflow of economic benefits will be required to settle the obligation. Provisions are determined by discounting the expected future cash flows at a pre-tax i) Product warranty expenses The estimated liability for product warranties is recorded when products are sold. These estimates are established using historical information on the nature, frequency and average cost of warranty claims and management estimates regarding possible future incidences based on actions on product failures. The timing of outflows will vary as and when warranty claim will arise, being typically up to six years. The Company also has back-to-back ii) Residual risk In certain markets, the Company is responsible for the residual risk arising on vehicles sold by dealers under leasing arrangements. The provision is based on the latest available market expectations of future residual value trends. The timing of the outflows will be at the end of the lease arrangements – being typically up to three years. iii) Legal and product liability Legal and product liability provision is recorded in respect of compliance with regulations and known litigations which impact the Company. The product liability claim primarily relates to motor accident claims, consumer complaints, dealer/supplier terminations, personal injury claims and compliance with regulations. iv) Environmental liability Environmental liability relates to various environmental remediation cost such as asbestos removal and land clean up. The timing of when these costs will be incurred is not known with certainty. j. Foreign currency These consolidated financial statements are presented in Indian rupees, which is the functional currency of Tata Motors Limited. Transactions in foreign currencies are recorded at the exchange rate prevailing on the date of transaction. Foreign currency denominated monetary assets and liabilities are re-measured For the purpose of consolidation, the assets and liabilities of the Company’s foreign operations are translated to Indian rupees at the exchange rate prevailing on the balance sheet date, and the income and expenses at the average rate of exchange for the respective months. Exchange differences arising are recognized as currency translation reserve under equity. Exchange differences arising from the translation of foreign operations previously recognized in currency translation reserve in equity are not reclassified from equity to the income statement until the disposal of such operation. k. Income taxes Income tax expense comprises current and deferred taxes. Income tax expense is recognized in the income statement except when they relate to items that are recognized outside profit or loss (whether in other comprehensive income or directly in equity), in which case tax is also recognized outside profit or loss, or where they arise from the initial accounting for business combination. In the case of a business combination the tax effect is included in accounting for the business combination. Current income taxes are determined based on respective taxable income of each taxable entity and tax rules applicable for respective tax jurisdictions. Deferred tax assets and liabilities are recognized for the future tax consequences of temporary differences between the carrying values of assets and liabilities and their respective tax bases, and unutilized business loss and depreciation carry-forwards and tax credits. Such deferred tax assets and liabilities are computed separately for each taxable entity and for each taxable jurisdiction. Deferred tax assets are recognized to the extent that it is probable that future taxable income will be available against which the deductible temporary differences, unused tax losses, depreciation carry-forwards and unused tax credits could be utilized. Deferred tax assets and liabilities are measured based on the tax rates that are expected to apply in the period when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted by the balance sheet date. Current and Deferred tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax liabilities and when they relate to income taxes levied by the same taxation authority and the Company intends to settle its current tax assets and liabilities on a net basis. l. Earnings per share Basic earnings per share has been computed by dividing net income by the weighted average number of shares outstanding during the year. Partly paid up shares are included as fully paid equivalents according to the fraction paid up. Diluted earnings per share has been computed using the weighted average number of shares and dilutive potential shares, except where the result would be anti-dilutive. m. Inventories Inventories (other than those recognized consequent to the sale of vehicles subject to repurchase arrangements) are valued at the lower of cost and net realizable value. Cost of raw materials, components and consumables are ascertained on a first in first out basis. Cost, including fixed and variable production overheads, are allocated to work-in-progress Inventories include vehicles sold subject to repurchase arrangements. These vehicles are carried at cost to the Company and are amortized in changes in inventories of finished goods to their residual values (i.e., estimated second hand sale value) over the term of the arrangement. n. Property, plant and equipment Property, plant and equipment are stated at cost of acquisition or construction less accumulated depreciation less accumulated impairment, if any. Freehold land is measured at cost and is not depreciated. Heritage assets, comprising antique vehicles purchased by the Company, are not depreciated as they are considered to have a residual value in excess of cost. Residual values are re-assessed Cost includes purchase price, taxes and duties, labor cost and direct overheads for self-constructed assets and other direct costs incurred up to the date the asset is ready for its intended use. Interest cost incurred for constructed assets is capitalized up to the date the asset is ready for its intended use, based on borrowings incurred specifically for financing the asset or the weighted average rate of all other borrowings, if no specific borrowings have been incurred for the asset. Depreciation is provided on a straight-line basis over estimated useful lives of the assets. Estimated useful lives of the assets are as follows: Type of Asset Estimated useful life Buildings 20 to 60 years Plant and equipment 3 to 30 years Computers 3 to 6 years Vehicles 3 to 11 years Furniture and fixtures 3 to 21 years Assets held under finance leases are depreciated over their expected useful lives on the same basis as owned assets or, where shorter, the term of the relevant lease. The depreciation period is reviewed at least at each year–end. Changes in expected useful lives are treated as changes in accounting estimates. Depreciation is not recorded on capital work-in-progress Capital-work-in-progress o. Intangible assets Intangible assets purchased, including those acquired in business combinations, are measured at cost or fair value as of the date of acquisition where applicable less accumulated amortization and accumulated impairment, if any. Intangible assets with indefinite lives are reviewed annually to determine whether indefinite-life assessment continues to be supportable. If not, the change in the useful-life assessment from indefinite to finite is made on a prospective basis. Amortization is provided on a straight-line basis over estimated useful lives of the intangible assets as per details below: Type of Asset Estimated Patents and technological know-how 2 to 12 years Customer related intangibles–Dealer network 20 years Intellectual property rights 3 to 10 years Software 1 to 8 years The amortization period for intangible assets with finite useful lives is reviewed at least at each year-end. Capital work-in-progress Internally generated intangible asset Research costs are charged to the income statement in the year in which they are incurred. Product development costs incurred on new vehicle platform, engines, transmission and new products are recognized as intangible assets, when feasibility has been established, the Company has committed technical, financial and other resources to complete the development and it is probable that asset will generate probable future economic benefits. The costs capitalized include the cost of materials, direct labor and directly attributable overhead expenditure incurred up to the date the asset is available for use. Interest cost incurred is capitalized up to the date the asset is ready for its intended use, based on borrowings incurred specifically for financing the asset or the weighted average rate of all other borrowings if no specific borrowings have been incurred for the asset. Product development cost is amortized over a period of 24 months to 120 months. Capitalized development expenditure is measured at cost less accumulated amortization and accumulated impairment, if any. In Fiscal 2018, assets written off/loss on sale of assets and other (net) amounting to Rs.29,148.6 million has been presented as a separate line in the income statement. Previously, these were included and presented in the income statement within the line item “Other (income)/loss (net). The change in presentation has been retrospectively applied for full periods presented. The change in presentation does not affect Net income, Total comprehensive income and earnings per share in any of the periods presented. p. Leases At the inception of a lease, the lease arrangement is classified as either a finance lease or an operating lease, based on the substance of the lease arrangement. Assets taken on finance lease A finance lease is recognized as an asset and a liability at the commencement of the lease, at the lower of the fair value of the asset and the present value of the minimum lease payments. Initial direct costs, if any, are also capitalized and, subsequent to initial recognition, the asset is accounted for in accordance with the accounting policy applicable to that asset. Minimum lease payments made under finance leases are apportioned between the finance expense and the reduction of the outstanding liability. The finance expense is allocated to each period during the lease term so as to produce a constant periodic rate of interest on the remaining balance of the liability. Assets taken on operating lease Leases other than finance leases are operating leases which are not recognized on the Company’s balance sheet. Payments made under operating leases are recognized in the income statement on a straight-line basis over the term of the lease. q. Impairment i) Goodwill Cash generating units to which goodwill is allocated are tested for impairment annually at each balance sheet date, or more frequently when there is an indication that the unit may be impaired. If the recoverable amount of the cash generating unit is less than the carrying amount of the unit, the impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to that unit and then to the other assets of the unit pro rata on the basis of carrying amount of each asset in the unit. Goodwill impairment loss recognized is not reversed in subsequent period. ii) Property, plant and equipment and other intangible assets At each balance sheet date, the Company assesses whether there is any indication that any property, plant and equipment and intangible assets with finite lives may be impaired. If any such impairment exists the recoverable amount of an asset is estimated to determine the extent of impairment, if any. Where it is not possible to estimate the recoverable amount of an individual asset, the Company estimates the recoverable amount of the cash-generating unit to which the asset belongs. Intangible assets with indefinite useful lives and intangible assets not yet available for use, are tested for impairment annually at each balance sheet date, or earlier, if there is an indication that the asset may be impaired. Recoverable amount is the higher of fair value less costs to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax If the recoverable amount of an asset (or cash-generating unit) is estimated to be less than its carrying amount, the carrying amount of the asset (or cash-generating unit) is reduced to its recoverable amount. An impairment loss is recognized immediately in the income statement. r. Employee benefits i) Pension plans The Jaguar Land Rover subsidiaries operate several defined benefit pension plans, which are contracted out of the second state pension scheme until April 5, 2016. The assets of the plan are held in separate trustee administered funds. The plans provide for monthly pension after retirement as per salary drawn and service period as set out in rules of each fund. Contributions to the plans by the subsidiary group take into consideration the results of actuarial valuations. The plans with a surplus position at the year-end A separate defined contribution plan is available to employees of Jaguar Land Rover. Costs in respect of this plan are charged to the income statement as incurred. ii) Gratuity Tata Motors Limited and its subsidiaries and joint operations in India have an obligation towards gratuity, a defined benefit retirement plan covering eligible employees. The plan provides for a lump-sum Tata Motors Limited and its subsidiaries and joint operations in India account for the liability for gratuity benefits payable in the future based on an actuarial valuation. iii) Superannuation Tata Motors Limited and some of its subsidiaries in India have two superannuation plans, a defined benefit plan and a defined contribution plan. An eligible employee on April 1, 1996 could elect to be a member of either plan. Employees who are members of the defined benefit superannuation plan are entitled to benefits depending on the years of service and salary drawn. The monthly pension benefits after retirement range from 0.75% to 2% of the annual basic salary for each year of service. Tata Motors Limited and such subsidiaries account for superannuation benefits payable in future under the plan based on an actuarial valuation. With effect from April 1, 2003, this plan was amended and benefits earned by covered employees have been protected as at March 31, 2003. Employees covered by this plan are prospectively entitled to benefits computed on a basis that ensures that the annual cost of providing the pension benefits would not exceed 15% of salary. During the year ended March 31, 2015, the employees covered by this plan were given a one-time one- Separate irrevocable trusts are maintained for employees covered and entitled to benefits. Tata Motors Limited and its subsidiaries contribute up to 15% or Rs.150,000, whichever is lower, of the eligible employees’ salary to the trust every year. Such contributions are recognized as an expense when incurred. Tata Motors Limited and such subsidiaries have no further obligation beyond this contribution. iv) Bhavishya Kalyan Yojana (BKY) Bhavishya Kalyan Yojana is an unfunded defined benefit plan for employees of Tata Motors Limited and some of its subsidiaries. The benefits of the plan include pension in certain cases, payable up to the date of normal superannuation had the employee been in service, to an eligible employee at the time of death or permanent disablement, while in service, either as a result of an injury or as certified by the appropriate authority. The monthly payment to dependents of the deceased/disabled employee under the plan equals 50% of the salary drawn at the time of death or accident or a specified amount, whichever is greater. Tata Motors Limited and these subsidiaries account for the liability for BKY benefits payable in the future based on an actuarial valuation. v) Provident fund and family pension In accordance with Indian law, eligible employees of Tata Motors Limited and some of its subsidiaries and joint operations are entitled to receive benefits in respect of provident fund, a defined contribution plan, in which both employees and the Company make monthly contributions at a specified percentage of the covered employees’ salary (currently 12% of employees’ salary). The contributions, as specified under the law, are made to the provident fund and pension fund set up as an irrevocable trust by Tata Motors Limited and its subsidiaries or to respective Regional Provident Fund Commissioner and the Central Provident Fund under the State Pension scheme. The interest rate payable to the members of the trust shall not be lower than the statutory rate of interest declared by the Central Government under the Employees Provident Funds and Miscellaneous Provisions Act, 1952 and shortfall, if any, shall be made good by the Company. The liability in respect of the shortfall of interest earnings of the Fund is determined on the basis of an actuarial valuation. The interest guarantee is considered to be defined benefit. There is no shortfall as at March 31, 2019. vi) Severance indemnity Tata Daewoo Commercial Vehicle Company Limited, or TDCV, a subsidiary company incorporated in Korea; has an obligation towards severance indemnity, a defined benefit retirement plan, covering eligible employees. The plan provides for a lump sum payment to all employees with more than one year of employment equivalent to 30 days’ salary payable for each completed year of service. vii) Post-retirement medicare scheme Under this unfunded scheme, employees of Tata Motors Limited and some of its subsidiaries receive medical benefits subject to certain limits on amounts of benefits, periods after retirement and types of benefits, depending on their grade and location at the time of retirement. Employees separated from the Company as part of an Early Separation Scheme, on medical grounds or due to permanent disablement are also covered under the scheme. Tata Motors Limited and such subsidiaries account for the liability for post-retirement medical scheme based on an actuarial valuation. viii) Compensated absences Tata Motors Limited and some of its subsidiaries and joint operations provide for the encashment of leave or leave with pay subject to certain rules. The employees are entitled to accumulate leave subject to certain limits, for future encashment. The liability is provided based on the number of days of unutilized leave at each balance sheet date on the basis of an actuarial valuation. ix) Remeasurement gains and losses Remeasurement comprising actuarial gains and losses, the effect of the asset ceiling and the return on assets (excluding interest) relating to retirement benefit plans, are recognized directly in other comprehensive income in the period in which they arise. Remeasurement recorded in other comprehensive income is not reclassified to income statement. Actuarial gains and losses relating to long-term employee benefits are recognized in the income statement in the period in which they arise. x) Measurement date The measurement date of retirement plans is March 31. xi) The Present value of the defined benefit liability and the related current service cost and past service cost are measured using Projected Unit Credit Method. s. Dividends Any dividend declared or paid by Tata Motors Limited for any financial year is based on the profits available for distribution as reported in the unconsolidated statutory financial statements of Tata Motors Limited (Standalone) prepared in accordance with Generally Accepted Accounting Principles in India. Indian law permits the declaration and payment of dividend out of profits for the year or previous financial year(s) as stated in the statutory financial statements of Tata Motors Limited (Standalone) prepared in accordance with Generally Accepted Accounting Principles in India after providing for depreciation in accordance with the provisions of Schedule II to t

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Cash and cash equivalents	3. Cash and cash equivalents Cash and cash equivalents consist of the following: As at March 31, 2019 2019 2018 (In millions) Cash balances US$ 4.2 Rs. 292.1 Rs. 314.2 Balances with banks (including deposits with original maturity of up to three months) 3,113.4 215,305.9 146,853.3 Total US$ 3,117.6 Rs.215,598.0 Rs.147,167.5

Finance receivables

Finance receivables	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Finance receivables	4. Finance receivables Finance receivables consist of vehicle loans, the details of which are as follows: As at March 31, 2019 2019 2018 (In millions) Finance receivables US$ 4,982.7 Rs.344,577.4 Rs.250,707.6 Less: allowance for credit losses 120.5 8,330.5 11,717.9 Total US$ 4,862.2 Rs.336,246.9 Rs.238,989.7 Current portion 1,670.4 115,515.2 84,016.5 Non-current 3,191.8 220,731.7 154,973.2 Total US$ 4,862.2 Rs.336,246.9 Rs.238,989.7 Changes in the allowance for credit losses in finance receivables are as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 169.4 Rs.11,717.9 Rs.35,975.1 Rs.44,131.9 Effect of IFRS 9 transition 2.6 177.8 — — Allowances made during the year 46.3 3,202.4 255.2 5,653.5 Written off (97.8 ) (6,767.6 ) (24,512.4 ) (13,810.3 ) Balance at the end US$ 120.5 Rs. 8,330.5 Rs.11,717.9 Rs.35,975.1

Allowance for trade and other r

Allowance for trade and other receivables	12 Months Ended
	Mar. 31, 2019
Trades and other receivables [Member]
Statement [line items]
Allowance for trade and other receivables	5. Allowance for trade and other receivables Change in the allowances for trade and other receivables are as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 213.7 Rs.14,776.2 Rs.15,170.3 Rs.14,460.4 Allowances made during the year 31.0 2,141.9 145.7 1,706.0 Written off (57.5 ) (3,974.4 ) (454.9 ) (1,340.3 ) Currency translation (5.1 ) (353.3 ) 45.6 344.2 Reversal of/(classified as) held for sale 1.9 130.5 (130.5 ) — Balance at the end US$ 184.0 Rs.12,720.9 Rs.14,776.2 Rs.15,170.3

Other Investments - non-current

Other Investments - non-current	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Other Investments - non-current	6. Other Investments - non-current As at March 31, As at March 31, 2019 2019 2018 (In millions) Available Loans and IAS 39 Category Unquoted Total (a) Investments - measured at Fair value through Other Comprehensive Income Equity shares (quoted) (refer note 1 below) US$ 43.9 Rs. 3,033.9 Rs. 369.5 Rs. — Rs. — Rs. — Rs. 369.5 Equity shares (unquoted) 63.3 4,379.0 — — 2,036.9 1,607.9 3,644.8 Total US$ 107.2 Rs. 7,412.9 Rs. 369.5 Rs. — Rs. 2,036.9 Rs. 1,607.9 Rs. 4,014.3 (b) Investments - measured at Fair value through profit or loss Equity shares (quoted) (refer note 2 below) US$ 61.2 Rs. 4,231.4 Rs. — Rs. — Rs. — Rs. — Rs. — Mutual funds 4.2 288.4 — — — — — Non-cumulative 0.8 54.0 — 4.0 — — 4.0 Cumulative redeemable preference shares 0.4 25.0 — 25.0 — — 25.0 Equity shares (unquoted) 18.0 1,242.8 — — — 2,468.2 2,468.2 Convertible debentures 21.6 1,490.8 — 854.0 — — 854.0 Others 2.8 191.0 — 176.0 — — 176.0 Total US$ 109.0 Rs. 7,523.4 Rs. — Rs. 1,059.0 Rs. — Rs. 2,468.2 Rs. 3,527.2 (c) Investments - measured at amortized cost Non-convertible US$ 0.6 Rs. 38.8 Rs. — Rs. 35.0 Rs. — Rs. — Rs. 35.0 Total US$ 0.6 Rs. 38.8 Rs. — Rs. 35.0 Rs. — Rs. — Rs. 35.0 Total (a+b+c) US$ 216.8 Rs. 14,975.1 Rs. 369.5 Rs. 1,094.0 Rs. 2,036.9 Rs. 4,076.1 Rs. 7,576.5 Note: 1 During the year ended March 31, 2019, the Company reassessed its holdings in Tata Steel Limited classified as held for sale at March 31, 2018 as no longer held for sale due to delays experienced in their disposal. Accordingly, these investments are transferred from current to non-current 2 During the year ended March 31, 2019, the Company’s investments in Lyft Incorporated got listed in NASDAQ stock exchange. The carrying value of these equity shares are Rs.4,231.4 million and Rs.2,047.0 million as at March 31, 2019 and 2018, respectively.

Other Investments - current

Other Investments - current	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Other Investments - current	7. Other Investments - current As at March 31, As at March 31, 2019 2019 2018 (In millions) IAS 39 Category Available Loans and Unquoted Unquoted Total (a) Investments - measured at Fair value through Other Comprehensive Income Equity Shares (quoted) (refer note 6(1)) US$ 0.1 Rs. 9.2 Rs. 3,035.3 Rs. — Rs. — Rs. — Rs. 3,035.3 Total US$ 0.1 Rs. 9.2 Rs. 3,035.3 Rs. — Rs. — Rs. — Rs. 3,035.3 (b) Investments - measured at Fair value through profit and loss Mutual funds US$ 172.4 Rs. 11,919.0 Rs. 16,007.5 Rs. — Rs. — Rs. — Rs. 16,007.5 Total US$ 172.4 Rs. 11,919.0 Rs. 16,007.5 Rs. — Rs. — Rs. — Rs. 16,007.5 (c) Investments - measured at amortized cost Unquoted: Money market funds US$ 1,120.0 Rs. 77,455.1 Rs. 127,594.7 Rs. — Rs. — Rs. — Rs. 127,594.7 Total US$ 1,120.0 Rs. 77,455.1 Rs. 127,594.7 Rs. — Rs. — Rs. — Rs. 127,594.7 Total (a+b+c) US$ 1,292.5 Rs. 89,383.3 Rs. 146,637.5 Rs. — Rs. — Rs. — Rs. 146,637.5

Other financial assets

Other financial assets	12 Months Ended
	Mar. 31, 2019
Statement [line items]
Other financial assets	8. Other financial assets - current Other financial assets - current consist of the following: As at March 31, 2019 2019 2018 (In millions) Derivative financial instruments US$ 178.7 Rs. 12,355.4 Rs. 24,761.3 Loans to channel partners 12.8 885.2 188.4 Advances and other receivables recoverable in cash 383.8 26,543.0 24,020.8 Inter corporate deposits 0.3 23.1 3.2 Margin money with banks 21.6 1,495.8 417.1 Government grant receivables 72.3 5,003.1 4,114.0 Restricted bank deposits 52.9 3,652.3 4,938.8 Others 0.2 12.8 — Total US$ 722.6 Rs. 49,970.7 Rs. 58,443.6 Margin money with banks is restricted cash deposits and consists of collateral provided for transfer of finance receivables. Restricted bank deposits include Rs.2,509.3 million and Rs. 3,030.8 million as at March 31, 2019 and 2018, respectively, held as security in relation to interest and repayment of borrowings. Out of these deposits, Rs. 942.7 million and Rs. 850.9 million as at March 31, 2019 and 2018, respectively, are pledged till the maturity of the respective borrowings.
Other financial assets - noncurrent [Member]
Statement [line items]
Other financial assets	9. Other financial assets (non-current) Other financial assets - non-current As at March 31, 2019 2019 2018 (In millions) Derivative financial instruments US$ 131.8 Rs. 9,111.4 Rs. 28,469.0 Loans to channel partners 26.1 1,804.9 2,787.2 Advance and other receivables recoverable in cash 140.0 9,682.3 10,728.4 Margin money with banks 47.6 3,290.7 1,048.0 Government grants receivables 73.5 5,080.8 4,671.4 Loans to employees 3.8 262.9 280.6 Restricted deposits 10.9 751.1 690.6 Loans to joint arrangements 0.5 37.5 — Others 30.9 2,144.4 1,917.6 Total US$ 465.1 Rs. 32,166.0 Rs. 50,592.8 Margin money with banks is restricted cash deposits and consists of collateral provided for transfer of finance receivables. Restricted deposits as at March 31, 2019 and 2018, include Rs. 452.6 million and Rs. 507.6 million, respectively held as a financial deposit in relation to ongoing legal cases.

Inventories

Inventories	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Inventories	10. Inventories Inventories consist of the following: As at March 31, 2019 2019 2018 (In millions) Raw materials, components and consumables US$ 520.9 Rs. 36,026.0 Rs. 45,175.0 Work-in-progress 562.8 38,917.6 40,431.7 Finished goods 4,556.0 315,072.3 338,689.5 Total US$ 5,639.7 Rs. 390,015.9 Rs. 424,296.2 Inventories of finished goods include Rs. 43,807.1 million and Rs. 40,236.1 million as at March 31, 2019 and 2018, respectively, relating to vehicles sold subject to repurchase arrangements. Cost of inventories (including cost of purchased products) recognized as expense during the years ended March 31, 2019, 2018 and 2017, amounted to Rs. 2,283,424.2 million, Rs. 2,172,364.1 million and Rs. 1,975,324.2 million, respectively. During the years ended March 31, 2019, 2018 and 2017, the Company recorded inventory write-down expenses of Rs. 6,086.3 million, Rs.6,074.2 million and Rs. 3,725.1 million (excluding provision for loss of inventory at port of Tianjin in China mentioned below), respectively. A provision of Rs. 16,383.9 million (GBP 157 million)(net of insurance recoveries of Rs. 5,342.4 million (GBP 55 million)) has been recognized against the carrying value of inventory during the year ended March 31, 2016, for the damage due to explosion at the port of Tianjin in China in August 2015. During the year ended March 31, 2018 and 2017, the Company has reversed initial provision amounting to Rs. 111.9 million (GBP 1.4 million) and Rs. 13,301.0 million (GBP 151 million), respectively relating to insurance recoveries, recovery of import duties and taxes and an updated assessment of the condition of the remaining vehicles.

Other current assets

Other current assets	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Other current assets	11. Other current assets Other current assets consist of the following: As at March 31, 2019 2019 2018 (In millions) Advances to suppliers and contractors US$ 62.8 Rs. 4,340.7 Rs. 3,640.2 Taxes recoverable, statutory deposits and dues from government 733.4 50,719.5 56,749.8 Prepaid expenses 175.1 12,106.8 14,403.5 Others 21.0 1,455.2 1,832.0 Total US$ 992.3 Rs. 68,622.2 Rs. 76,625.5

Other non-current assets

Other non-current assets	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Other non-current assets	12. Other non-current Other non-current As at March 31, 2019 2019 2018 (In millions) Taxes recoverable, statutory deposits and dues from government US$ 156.4 Rs. 10,819.0 Rs. 10,496.3 Prepaid rentals on operating leases 52.4 3,625.7 3,817.2 Prepaid expenses 111.1 7,684.2 7,660.0 Others 49.2 3,399.6 2,027.6 Total US$ 369.1 Rs. 25,528.5 Rs. 24,001.1 Others include Rs. 16.4 million and Rs. 15.7 million towards pension assets as at March 31, 2019 and 2018, respectively.

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Property, plant and equipment	13. Property, plant and equipment Property, plant and equipment consists of the following: Land and Plant and Vehicles Computers Furniture Heritage Total (In millions) Cost as at April 1, 2018 Rs. 196,031.4 Rs. 992,423.7 Rs. 3,841.5 Rs. 21,300.9 Rs. 14,293.8 Rs. 3,546.9 Rs. 1,231,438.2 Additions 68,356.7 162,366.3 1,095.1 5,374.5 2,255.1 243.8 239,691.5 Currency translation (5,218.1 ) (16,339.3 ) (6.4 ) (299.4 ) (199.0 ) (49.2 ) (22,111.4 ) Reversal of assets classified as held for sale 638.9 461.8 38.8 1,568.2 368.9 — 3,076.6 Disposal (426.3 ) (55,547.1 ) (470.4 ) (2,723.8 ) (463.7 ) (13.7 ) (59,645.0 ) Cost as at March 31, 2019 259,382.6 1,083,365.4 4,498.6 25,220.4 16,255.1 3,727.8 1,392,449.9 Accumulated Depreciation as at April 1, 2018 (33,149.1 ) (490,346.0 ) (1,859.2 ) (12,332.2 ) (7,199.3 ) — (544,885.8 ) Depreciation for the year (9,199.8 ) (107,143.4 ) (675.9 ) (2,544.8 ) (1,263.6 ) — (120,827.5 ) Reversal of assets classified as held for sale (260.4 ) (137.3 ) (21.8 ) (1,015.0 ) (167.0 ) — (1,601.5 ) Currency translation 488.1 4,451.2 (0.1 ) 67.9 70.1 — 5,077.2 Write off/impairment of assets — (105,718.0 ) (60.5 ) (2,348.2 ) (1,443.4 ) (1,616.9 ) (111,187.0 ) Disposal 251.2 51,925.2 392.8 2,322.0 390.5 — 55,281.7 Accumulated Depreciation as at March 31, 2019 (41,870.0 ) (646,968.3 ) (2,224.7 ) (15,850.3 ) (9,612.7 ) (1,616.9 ) (718,142.9 ) Net carrying amount as at March 31, 2019 Rs. 217,512.6 Rs. 436,397.1 Rs. 2,273.9 Rs. 9,370.1 Rs. 6,642.4 Rs. 2,110.9 Rs. 674,307.0 Capital work-in-progress 87,996.3 Total Rs. 762,303.3 US$ 11,023.1 Cost as at April 1, 2017 Rs. 146,419.0 Rs. 791,127.5 Rs. 2,989.0 Rs. 19,466.4 Rs. 12,223.1 Rs. 4,233.6 Rs. 976,458.6 Additions 34,576.8 156,105.9 1,340.2 2,708.2 1,464.3 — 196,195.4 Asset acquired in business combination 21.6 2.2 — 131.2 427.3 — 582.3 Assets classified as held for sale (1,273.1 ) (3,675.3 ) (38.8 ) (1,606.9 ) (407.3 ) — (7,001.4 ) Write down of assets — (5,368.2 ) — — — (1,100.6 ) (6,468.8 ) Currency translation 16,380.8 83,892.9 114.6 1,436.4 1,218.2 500.0 103,542.9 Disposal (93.7 ) (29,661.3 ) (563.5 ) (834.4 ) (631.8 ) (86.1 ) (31,870.8 ) Cost as at March 31, 2018 196,031.4 992,423.7 3,841.5 21,300.9 14,293.8 3,546.9 1,231,438.2 Accumulated Depreciation as at April 1, 2017 (24,775.8 ) (388,261.8 ) (1,832.6 ) (11,673.6 ) (6,016.6 ) — (432,560.4 ) Depreciation for the year (6,560.6 ) (97,363.3 ) (483.8 ) (1,869.4 ) (1,343.8 ) — (107,620.9 ) Assets classified as held for sale 340.5 1,160.3 25.8 955.6 133.6 — 2,615.8 Write down of assets — 3,890.8 — — — — 3,890.8 Currency translation (2,181.0 ) (37,328.0 ) (62.1 ) (519.1 ) (543.4 ) — (40,633.6 ) Disposal 27.8 27,556.0 493.5 774.3 570.9 — 29,422.5 Accumulated Depreciation as at March 31, 2018 (33,149.1 ) (490,346.0 ) (1,859.2 ) (12,332.2 ) (7,199.3 ) — (544,885.8 ) Net carrying amount as at March 31, 2018 Rs. 162,882.3 Rs. 502,077.7 Rs. 1,982.3 Rs. 8,968.7 Rs. 7,094.5 Rs. 3,546.9 Rs. 686,552.4 Capital work-in-progress 163,891.7 Total Rs. 850,444.1 Notes: 1. Net carrying amounts of property, plant and equipment under finance lease arrangements were as follows: As at March 31, 2019 2019 2018 (In millions) Buildings US$ 8.0 Rs. 553.2 Rs. 378.5 Plant and equipment 4.3 298.2 693.2 Computers 0.8 56.0 121.0 Total US$ 13.1 Rs. 907.4 Rs. 1,192.7 2. Land and buildings includes freehold land of Rs. 29,582.7 million and Rs. 30,097.9 million as at March 31, 2019 and 2018, respectively.

Leases

Leases	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Leases	14. Leases The Company has taken land, buildings, plant and equipment, computers and furniture and fixtures under operating and finance leases. The following is the summary of future minimum lease rental payments under non-cancellable As at March 31, 2019 2018 Operating Finance Operating Finance Minimum Lease Payments Minimum Lease Payments Present value of minimum lease payments Minimum Minimum Present (In millions) Not later than one year Rs. 10,994.1 Rs. 330.0 Rs. 295.9 Rs. 8,808.0 Rs. 253.9 Rs. 222.3 Later than one year but not later than five years 26,261.2 970.9 791.2 21,527.8 282.5 221.9 Later than five years 24,968.3 2,492.5 647.6 23,342.9 380.6 245.6 Total minimum lease commitments Rs. 62,223.6 Rs. 3,793.4 Rs. 1,734.7 Rs. 53,678.7 Rs. 917.0 Rs. 689.8 US$ 899.8 US$ 54.9 US$ 25.1 Less: future finance charges Rs. (2,058.7 ) Rs. (227.2 ) Present value of minimum lease payments Rs. 1,734.7 Rs. 689.8 Included in the financial statements as: Other financial liabilities — current (refer note 22) Rs. 173.0 Rs. 222.3 Other financial liabilities — non-current 1,561.7 467.5 Rs. 1,734.7 Rs. 689.8 US$ 25.1 Total operating lease rent expenses were Rs. 10,774.2 million, Rs. 10,223.9 million and Rs. 8,224.8 million for the years ended March 31, 2019, 2018 and 2017, respectively.

Goodwill

Goodwill	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Goodwill	Goodwill As at March 31, 2019 2019 2018 (In millions) Balance at the beginning US$ 16.8 Rs. 1,164.5 Rs. 6,733.2 Impairment (1.2 ) (81.1 ) Reversal of/(classified as) held for sale 92.6 6,399.2 (5,579.1 ) Currency translation (0.1 ) (3.9 ) 10.4 Balance at the end US$ 108.1 Rs. 7,478.7 Rs. 1,164.5 As at March 31, 2019, goodwill of Rs. 1,079.5 million and Rs. 6,399.2 million relates to the “ passenger vehicles - automotive and related activity segment (Tata and other brand vehicles)” and “others” segment, respectively. As at March 31, 2018, goodwill of Rs. 1,081.0 million and Rs. 83.5 million relates to the passenger vehicles - automotive and related activity segment (Tata and other brand vehicles) and Jaguar Land Rover Segment, respectively. As at March 31, 2019, goodwill of Rs. 6,399.2 million has been allocated to software consultancy and service cash generating unit. The recoverable amount of the cash generating unit has been determined based on value in use. Value in use has been determined based on future cash flows, after considering current economic conditions and trends, estimated future operating results, growth rates and anticipated future economic conditions. As at March 31, 2019, the estimated cash flows for a period of 5 years were developed using internal forecasts, and a pre-tax

Intangible assets

Intangible assets	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Intangible assets	16(a). Intangible assets Intangible assets consist of the following: Software Patents and Customer Intellectual Product Indefinite life trademarks Total (In millions) Cost as at April 1, 2018 Rs. 63,015.3 Rs. 15,221.2 Rs. 5,612.7 Rs. 3,268.3 Rs. 681,420.6 Rs. 57,063.1 Rs. 825,601.2 Additions 8,446.9 21.8 — 445.9 114,174.4 — 123,089.0 Reversal of assets classified as held for sale 2,488.3 17.5 486.9 — — — 2,992.7 Currency translation (1,923.6 ) (283.5 ) (119.6 ) (84.5 ) (12,321.8 ) (1,097.0 ) (15,830.0 ) Fully amortized not in use (4,345.1 ) (382.0 ) — (82.8 ) (85,732.2 ) — (90,542.1 ) Cost as at March 31, 2019 67,681.8 14,595.0 5,980.0 3,546.9 697,541.0 55,966.1 845,310.8 Accumulated amortization at April 1, 2018 (32,351.4 ) (13,956.4 ) (2,731.2 ) (882.3 ) (317,707.6 ) — (367,628.9 ) Amortization for the year (10,434.8 ) (768.3 ) (293.5 ) (395.7 ) (97,478.0 ) — (109,370.3 ) Reversal of assets classified as held for sale (1,706.3 ) (4.8 ) (110.0 ) — — — (1,821.1 ) Write down/impairment of assets (6,694.0 ) — (617.3 ) (474.0 ) (80,928.6 ) (13,168.8 ) (101,882.7 ) Currency translation 540.6 375.4 52.3 (95.9 ) 4,961.1 (141.1 ) 5,692.4 Fully amortized not in use 4,345.1 382.0 — 82.8 85,732.2 — 90,542.1 Accumulated amortization at March 31, 2019 (46,300.8 ) (13,972.1 ) (3,699.7 ) (1,765.1 ) (405,420.9 ) (13,309.9 ) (484,468.5 ) Net carrying amount as at March 31, 2019 Rs. 21,381.0 Rs. 622.9 Rs. 2,280.3 Rs. 1,781.8 Rs. 292,120.1 Rs. 42,656.2 Rs. 360,842.3 Capital work-in-progress 219,713.6 Total Rs. 580,555.9 US$ 8,395.0 Cost as at April 1, 2017 Rs. 52,128.4 Rs. 13,136.9 Rs. 5,166.0 Rs. 1,950.0 Rs. 468,329.6 Rs. 50,035.0 Rs. 590,745.9 Additions 8,472.0 427.5 223.1 615.3 155,417.4 — 165,155.3 Asset acquired in Business Combination 126.2 — — 335.9 — — 462.1 Assets classified as held for sale (2,488.3 ) (16.8 ) (486.9 ) — — — (2,992.0 ) Currency translation 6,943.2 1,673.6 710.5 367.1 69,602.0 7,028.1 86,324.5 Fully amortized not in use (2,166.2 ) — — — (11,928.4 ) — (14,094.6 ) Cost as at March 31, 2018 63,015.3 15,221.2 5,612.7 3,268.3 681,420.6 57,063.1 825,601.2 Accumulated amortization at April 1, 2017 (22,148.2 ) (10,960.5 ) (2,254.4 ) (396.2 ) (207,832.3 ) — (243,591.6 ) Amortization for the year (9,972.6 ) (1,350.7 ) (260.9 ) (536.7 ) (90,076.4 ) — (102,197.3 ) Assets Held for Sale 1,700.5 6.4 109.6 — — — 1,816.5 Write down of assets (1,127.1 ) — — — — — (1,127.1 ) Currency translation (2,970.2 ) (1,651.6 ) (325.5 ) 50.6 (31,727.3 ) — (36,624.0 ) Fully amortized not in use 2,166.2 — — — 11,928.4 — 14,094.6 Accumulated amortization at March 31, 2018 (32,351.4 ) (13,956.4 ) (2,731.2 ) (882.3 ) (317,707.6 ) — (367,628.9 ) Net carrying amount as at March 31, 2018 Rs. 30,663.9 Rs. 1,264.8 Rs. 2,881.5 Rs. 2,386.0 Rs. 363,713.0 Rs. 57,063.1 Rs. 457,972.3 Capital work-in-progress 227,195.6 Total Rs. 685,167.9 1. The useful life of trademarks and brands in respect of the acquired Jaguar Land Rover businesses have been determined to be indefinite as the Company expects to generate future economic benefits indefinitely from these assets. The indefinite life intangible assets have been allocated to the Jaguar Land Rover businesses. The recoverable amount of the cash generating unit has been determined based on value in use. Value in use has been determined based on future cash flows after considering current economic conditions and trends, estimated future operating results, growth rates and anticipated future economic conditions. 2. During the year ended March 31, 2014, legislation was enacted that allows United Kingdom (UK) companies to elect for the Research and Development Expenditure Credit (RDEC) on qualifying expenditures incurred since April 1, 2013, instead of the existing super-deduction rules. As a result of this election by the Company’s subsidiary in the UK, Rs. 8,350.6 million, Rs. 8,717.5 million and Rs. 7,626.7 million of the RDEC, for the years ended March 31, 2019, 2018 and 2017, respectively, the proportion relating to capitalized product development expenditure, have been offset against these assets. The remaining Rs. 1,601.5 million, Rs. 3,845.9 million and Rs.3,331.1 million for the years ended March 31, 2019, 2018 and 2017 respectively, have been recognized as incentives, a component of other income/(loss) (net). 16(b). Intangible assets under development Year ended March 31, 2019 2018 Cost as at April 1, US$ 3,285.3 Rs. 227,195.6 Rs. 224,359.5 Additions 2,511.7 173,698.8 161,196.8 Transferred to other intangible assets (1,773.1 ) (122,621.4 ) (164,960.7 ) Transferred to Held for Sale — — (1,901.0 ) Reversal of assets classified as Held for Sale 1.8 125.4 — Provision for impairment/Write off (778.9 ) (53,864.8 ) (15,766.4 ) Currency translation (69.7 ) (4,820.0 ) 24,267.4 Balance at the end US$ 3,177.1 Rs. 219,713.6 Rs. 227,195.6

Impairment of Jaguar Land Rover

Impairment of Jaguar Land Rover Business	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Impairment of Jaguar Land Rover Business	17. Impairment of Jaguar Land Rover Business The Company is of the view that the operations of its subsidiary Jaguar Land Rover (JLR) represent a single cash-generating unit (‘CGU’). Management performed an impairment assessment during the year ended March 31, 2019 due to change in market conditions especially in China, technology disruptions and rising cost of debt. The recoverable value of Rs. 722,907.6 million was determined by Value in Use (‘VIU’), which was marginally higher than the Fair Value less Cost of Disposal (‘FVLCD’) of the relevant assets of the CGU. The recoverable amount was lower than the carrying value of the CGU and this resulted in an impairment charge of Rs. 278,379.1 million recognized during the year ended March 31, 2019. The approach and key (unobservable) assumptions used to determine the CGU’s VIU were as follows: As at March 31, 2019 2018 Growth rate applied beyond approved forecast period 1.9 % 2.0 % Pre-tax 11.8 % 8.7 % The Company has considered it appropriate to undertake the impairment assessment with reference to the latest business plan which includes a 5 year cash flow forecast. The growth rates used in the value in use calculation reflect those inherent within the JLR’s business plan, which is primarily a function of the JLR’s cycle plan assumptions, past performance and management’s expectation of future market developments through to 2023/24. The future cash flows consider potential risks given the current economic environment and key assumptions, such as volume forecasts and margins. The Company has assessed the potential impacts of changes, if any, in tax and treaty arrangements globally, including proposed exit of the United Kingdom from European Union (Brexit) and the US Tariffs. The potential impact of reasonably possible outcomes of these events has been included in the VIU calculations. The cash flows for the year 2023/24 are extrapolated into perpetuity assuming a growth rate as stated above which is set with reference to weighted-average GDP growth of the countries in which JLR operates. The impairment loss of Rs. 278,379.1 million has been allocated initially against goodwill of Rs. 81.1 million and thereafter the residual amount has been allocated on a pro-rated As at March 31, (in millions) Property, plant and equipment 108,570.1 Capital work-in-progress 16,560.8 Goodwill 81.1 Other intangible assets 101,873.4 Intangible assets under development 51,293.7 Total 278,379.1 Sensitivity to key assumptions The change in the following table to assumptions used in the impairment review would, in isolation, lead to an increase to the aggregate impairment loss recognized as at March 31, 2019 (although it should be noted that these sensitivities do not take account of potential mitigating actions): As at March 31, In millions Increase in discount rate by 1% 100,828.7 Decrease in long-term growth rate applied beyond approved forecast period by 0.5% 43,716.6 Decrease in projected volume by 5% 388,923.7 Decrease in projected gross margin by 1% 188,986.0

Investments in equity accounted

Investments in equity accounted investees	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Investments in equity accounted investees	Investments in equity accounted investees: (a) Associates: The Company has no material associates as at March 31, 2019. The aggregate summarized financial information in respect of the Company’s immaterial associates that are accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Carrying amount of the Company’s interest in associates US$ 150.3 Rs. 10,393.4 Rs. 9,333.4 Year ended March 31, 2019 2019 2018 2017 (In millions) Company’s share of profit/(loss) in associates * US$ 16.1 Rs. 1,110.6 Rs. 1,183.0 Rs. 1,109.3 Company’s share of other comprehensive income in associates 1.2 83.2 (19.0 ) (155.1 ) Company’s share of total comprehensive income in associates US$ 17.3 Rs. 1,193.8 Rs. 1,164.0 Rs. 954.2 (i) Fair value of investment in an equity accounted associate for which published price quotation is available, which is a level 1 input, was Rs. 1,696.9 million and Rs. 3,380.4 million as at March 31, 2019 and 2018, respectively. The carrying amount as at March 31, 2019 and 2018, was Rs. 1,387.0 million and Rs. 1,414.8 million, respectively. (ii) During the year ended March 31, 2019, the Company purchased 26% of the share capital of Loginomic Tech Solutions Pvt. Limited for Rs. 26.6 million. The investment is accounted for as equity accounted investments as the Company has significant influence. (b) Joint ventures: (i) Details of the Company’s material joint venture as at March 31, 2019 are as follows: Principal activity Principal % holding Name of joint venture 2019 2018 Chery Jaguar Land Rover Automotive Co. Limited (Chery) Manufacture and China 50 % 50 % Chery is a limited liability company, whose legal form confers separation between the parties to the joint arrangement. There is no contractual arrangement or any other facts and circumstances that indicate that the parties to the joint venture have rights to the assets and obligations for the liabilities of the joint arrangement. Accordingly, Chery is classified as a joint venture. The summarized financial information in respect of Chery that is accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Current assets US$ 979.0 Rs. 67,701.9 Rs. 82,317.9 Non-current 1,883.4 130,244.7 122,184.9 Current liabilities (1,444.9 ) (99,923.6 ) (99,298.3 ) Non-current (159.7 ) (11,042.4 ) (14,184.1 ) The above amounts of assets and liabilities include the following: Cash and cash equivalents 413.6 28,601.3 40,466.8 Current financial liabilities (excluding trade and other payables and provisions) (363.8 ) (25,161.9 ) (3,885.2 ) Non-current (159.7 ) (11,042.3 ) (13,999.6 ) Share of net assets of material joint venture 628.9 43,490.3 45,510.2 Other consolidation adjustments (7.8 ) (534.9 ) (1,016.2 ) Carrying amount of the Company’s interest in joint venture US$ 621.1 Rs. 42,955.4 Rs. 44,494.0 Year ended March 31, 2019 2019 2018 2017 (In millions) Revenue US$ 2,251.7 Rs. 155,715.0 Rs. 237,876.1 Rs. 189,601.3 Net income/(loss) 16.2 1,119.5 43,381.3 27,320.6 Other comprehensive income — — — — Total comprehensive income for the year 16.2 1,119.5 43,381.3 27,320.6 The above net income includes the following: Depreciation and amortization 272.7 18,857.6 11,947.8 9,201.1 Interest income (15.8 ) (1,092.0 ) (2,298.7 ) (993.2 ) Interest expense (net) 18.3 1,266.3 609.0 706.6 Income tax expense/(credit) US$ 8.4 Rs. 578.1 Rs. 11,630.5 Rs. 9,014.4 Reconciliation of above summarized financial information to the carrying amount of the interest in the joint venture recognized in the consolidated financial statements: As at March 31, 2019 2019 2018 (In millions) Net assets of the joint venture US$ 1,257.8 Rs. 86,980.6 Rs. 91,020.4 Proportion of the Company’s interest in joint venture 628.9 43,490.3 45,510.2 Other consolidation adjustments (7.8 ) (534.9 ) (1,016.2 ) Carrying amount of the Company’s interest in joint venture US$ 621.1 Rs. 42,955.4 Rs. 44,494.0 During the year ended March 31, 2019, a dividend of Rs. 1,990.3 million was received by a subsidiary in UK from Chery Jaguar Land Rover Automotive Co. Ltd. (2018: Rs. 17,644.9 million, 2017: Rs. 5,928.8 million) (ii) The aggregate summarized financial information in respect of the Company’s immaterial joint ventures that are accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Carrying amount of the Company’s interest in joint ventures US$ — Rs. — Rs. 25.0 Year ended March 31, 2019 2019 2018 2017 (In millions) Company’s share of profit/(loss) in immaterial joint ventures* US$ (0.4 ) Rs. (25.0 ) Rs. 162.5 Rs. 276.5 Company’s share of other comprehensive income in immaterial joint ventures — — — (130.3 ) Company’s share of total comprehensive income in immaterial joint ventures US$ (0.4 ) Rs. (25.0 ) Rs. 162.5 Rs. 146.2 (c) Summary of carrying amount of the Company’s interest in equity accounted investees: As at March 31, 2019 2019 2018 (In millions) Carrying amount in immaterial associates US$ 150.3 Rs. 10,393.4 Rs. 4,359.9 Carrying amount in immaterial associates (held for sale)# — — 4,973.5 Carrying amount in material joint venture 621.1 42,955.4 44,494.0 Carrying amount in immaterial joint ventures — — 25.0 Total US$ 771.4 Rs. 53,348.8 Rs. 53,852.4 Current (held for sale)# US$ — Rs. — Rs. 4,973.5 Non current 771.4 53,348.8 48,878.9 Total US$ 771.4 Rs. 53,348.8 Rs. 53,852.4 # Carrying amount of investments in Tata Hitachi Construction Machinery Co. Pvt Ltd. Subsequent to the year ended March 31, 2019, the Company reassessed its holdings in Tata Hitachi Construction Machinery Co. Pvt Ltd. classified as held for sale at March 31, 2018 as no longer held for sale due to delays experienced in the disposal. Accordingly, the investments are transferred from current to non-current investments. (d) Summary of Company’s share of profit/(loss) in equity accounted investees: Year ended March 31, 2019 2019 2018 2017 (In millions) Share of profit/(loss) in immaterial associates US$ 16.1 Rs. 1,110.6 Rs. 1,183.0 Rs. 1,109.3 Share of profit/(loss) in material joint venture 8.1 559.8 21,690.7 13,660.3 Share of profit/(loss) on other adjustments in material joint venture 6.5 449.6 (253.6 ) (116.1 ) Share of profit/(loss) in immaterial joint ventures (0.4 ) (25.0 ) 162.5 276.5 US$ 30.3 Rs. 2,095.0 Rs. 22,782.6 Rs. 14,930.0 (e) Summary of Company’s share of other comprehensive income in equity accounted investees: Year ended March 31, 2019 2019 2018 2017 (In millions) Share of other comprehensive income in immaterial associates US$ 1.6 Rs. 111.5 Rs. (113.8 ) Rs. (40.0 ) Currency translation - immaterial associates (0.4 ) (28.3 ) 94.8 (115.1 ) Currency translation -material joint venture (8.1 ) (557.8 ) 4,015.7 (2,801.6 ) Currency translation -immaterial joint ventures — — — (130.3 ) US$ (6.9 ) Rs. (474.6 ) Rs. 3,996.7 Rs. (3,087.0 ) * Company’s share of profit/(loss) of the equity accounted investees has been determined after giving effect for the subsequent amortization/depreciation and other adjustments arising on account of fair value adjustments made to the identifiable net assets of the equity accounted investee as at the date of acquisition and other adjustment arising under the equity method of accounting.

Income taxes

Income taxes	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Income taxes	19. Income taxes The domestic and foreign components of net income before income tax: Year ended March 31, 2019 2019 2018 2017 (In millions) Net income/(loss) before income taxes India US$ 396.6 Rs. 27,429.8 Rs. (8,867.9 ) Rs. (46,507.6 ) Other than India (4,988.4 ) (344,982.9 ) 112,608.0 141,106.4 Total US$ (4,591.8 ) Rs. (317,553.1 ) Rs. 103,740.1 Rs. 94,598.8 The domestic and foreign components of income tax expense: Year ended March 31, 2019 2019 2018 2017 (In millions) Current taxes India US$ 72.8 Rs. 5,034.3 Rs. 2,420.0 Rs. 1,842.8 Other than India 249.0 17,217.9 30,608.5 29,531.1 Deferred taxes India (46.9 ) (3,241.9 ) 494.6 3,111.6 Other than India (642.6 ) (44,435.3 ) 4,155.1 550.1 Total income tax expense/(credit) US$ (367.7 ) Rs. (25,425.0 ) Rs. 37,678.2 Rs. 35,035.6 The reconciliation of estimated income tax to income tax expense/(credit) reported in the income statement is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Income/(loss) before income taxes US$ (4,591.8 ) Rs. (317,553.1 ) Rs. 103,740.1 Rs. 94,598.8 Income tax expense at tax rates applicable to individual entities (791.2 ) (54,712.2 ) 20,746.7 13,625.8 Additional deduction for patent, research and product development cost (27.3 ) (1,891.2 ) (4,099.8 ) (7,455.8 ) Items (net) not deductible for tax /not liable to tax : - foreign currency (gain)/loss relating to loans and deposits (net) (1.2 ) (82.8 ) 1,336.2 (739.8 ) - interest, loss on conversion option and other expenses relating to borrowings for investment 9.0 621.6 337.8 531.0 - Dividend from subsidiaries, joint operations, equity accounted investees and available-for-sale (0.2 ) (15.5 ) (50.1 ) 27.1 Undistributed earnings of subsidiaries, joint operations and equity accounted investees 18.5 1,277.8 9,170.1 4,134.3 Deferred tax assets not recognized because realization is not probable 68.5 4,738.7 9,902.3 29,372.1 Utilization/credit of unrecognized tax losses, unabsorbed depreciation and other tax benefits (101.5 ) (7,016.4 ) (3,583.3 ) (2,950.5 ) Previously recognized deferred tax assets written down on account of provision for impairment in Jaguar Land Rover 390.2 26,981.5 — — Profit on sale of business by a subsidiary to another subsidiary — — — 4,078.9 Profit on sale of investments in subsidiaries and Others (13.5 ) (932.0 ) — — Tax on share of (profit)/loss of equity accounted investees (net) (7.7 ) (532.7 ) (4,601.4 ) (3,146.7 ) Impact of change in statutory tax rates (refer note below) 65.7 4,540.4 5,392.6 (5,684.6 ) Others 23.0 1,597.8 3,127.1 3,243.8 Income tax expense/(credit) reported US$ (367.7 ) Rs. (25,425.0 ) Rs. 37,678.2 Rs. 35,035.6 Note: The UK Finance Act 2016 was enacted during the year ended March 31, 2017, which included provisions for a reduction in UK Corporation tax rate to 17% with effect from April 1, 2020. Accordingly, UK deferred tax has been provided at rates applicable when the temporary difference is expected to reverse. Included within ‘Impact of change in statutory tax rates’ is a charge of Rs. 4,648.4 million for the impact of change in the US federal rates from 35% to 21% on deferred tax assets for the year ended March 31, 2018. Significant components of deferred tax assets and liabilities for the year ended March 31, 2019 are as follows: Opening balance Adjustment of IFRS 15 Adjusted Balance Recognized in Recognized in/reclassified MAT Credit Reversal of classified as in earlier year Divestment of a Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 21,955.1 Rs. Rs. 21,955.1 Rs. (161.20 ) Rs. (0.1 ) Rs. — Rs. 24.3 Rs. 124.4 Rs. 21,942.5 Business loss carry forwards 42,737.4 84.5 42,821.9 (19,255.9 ) (723.9 ) — — — 22,842.1 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 30,213.9 — 30,213.9 3,911.1 2.2 — 21.2 24.5 34,172.9 Compensated absences and retirement benefits 8,426.3 — 8,426.3 32.7 3,858.5 — 132.4 13.0 12,462.9 Minimum alternate tax carry-forward 381.9 — 381.9 817.8 (15.8 ) 37.8 (155.5 ) 1,066.2 Property, plant and equipment 926.5 — 926.5 48,258.9 108.2 — — — 49,293.6 Derivative financial instruments 7,552.4 — 7,552.4 1,022.1 3,674.7 — 3.9 — 12,253.1 Unrealized profit on inventory 15,079.2 — 15,079.2 (3,811.5 ) 151.0 — — — 11,418.7 Others 10,927.9 — 10,927.9 1,687.1 (49.7 ) — 15.2 8.2 12,588.7 Total deferred tax assets Rs. 138,200.6 Rs. 84.5 Rs. 138,285.1 Rs. 32,501.1 Rs. 7,020.9 Rs. (15.8 ) Rs. 234.8 Rs. 14.6 Rs. 178,040.7 Deferred tax liabilities: Property, plant and equipment 16,852.0 — 16,852.00 (1,142.6 ) (119.7 ) — 56.0 72.1 15,717.8 Intangible assets 121,838.5 — 121,838.50 (12,420.5 ) (1,881.1 ) — (27.4 ) — 107,509.5 Undistributed earnings in subsidiaries, joint operations and equity accounted investees 19,397.2 — 19,397.20 (2,330.4 ) * (174.6 ) — — — 16,892.2 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — 169.50 — — — — — 169.5 Others 136.6 — 136.60 717.4 176.1 — 120.9 — 1,151.0 Total deferred tax liabilities Rs. 158,393.8 Rs. — Rs. 158,393.8 Rs. (15,176.1 ) Rs. (1,999.3 ) Rs. — Rs. 149.5 Rs. 72.1 Rs. 141,440.0 Net assets/(liabilities) Rs. (20,193.2 ) Rs. 84.5 Rs. (20,108.7 ) Rs. 47,677.2 Rs. 9,020.2 Rs. (15.8 ) Rs. 85.3 Rs. (57.5 ) Rs. 36,600.7 US$ (292.0 ) US$ 1.2 US$ (290.8 ) US$ 689.5 US$ 130.4 US$ (0.2 ) US$ 1.2 US$ (0.8 ) US$ 529.3 Deferred tax assets Rs. 51,511.1 Deferred tax liabilities Rs. (14,910.4 ) Deferred tax assets US$ 744.9 Deferred tax liabilities US$ (215.6 ) * Net of Rs. 3,608.2 million reversed on dividend distribution by subsidiaries. As at March 31, 2019, unrecognized deferred tax assets amount to Rs. 57,631.5 million and Rs. 62,928.4 million, which can be carried forward indefinitely and up to a specified period, respectively. These relate primarily to business and capital losses and other deductible temporary differences. The deferred tax asset has not been recognized on the basis that its recovery is not considered probable in the foreseeable future. Unrecognized deferred tax assets expire unutilized based on the year of origination as follows: March 31, In millions 2020 US$ 7.6 Rs. 525.0 2021 57.8 3,995.5 2022 59.9 4,142.4 2023 128.1 8,859.5 2024 103.6 7,161.4 Thereafter US$ 553.0 Rs. 38,244.6 Total US$ 910.0 Rs. 62,928.4 The Company has not recognized deferred tax liability on undistributed profits of certain subsidiaries amounting to Rs.445,510.6 million and Rs. 745,891.7 million as at March 31, 2019 and 2018, respectively, because it is able to control the timing of the reversal of temporary differences associated with such undistributed profits and it is probable that such differences will not reverse in the foreseeable future. Significant components of deferred tax assets and liabilities for the year ended March 31, 2018 are as follows: Opening Recognized in profit or loss Recognized in /reclassified Classified as Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 19,921.0 Rs. 2,150.3 Rs. 15.8 Rs. (132.1 ) Rs. 21,955.1 Business loss carry forwards 27,509.3 11,944.0 3,284.1 — 42,737.4 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 26,824.2 2,191.5 1,233.1 (34.9 ) 30,213.9 Compensated absences and retirement benefits 21,729.6 (7,224.7 ) (5,941.6 ) (137.0 ) 8,426.3 Minimum alternate tax carry-forward 749.2 (329.5 ) — (37.8 ) 381.9 Property, plant and equipment 1,119.0 (308.3 ) 115.8 — 926.5 Derivative financial instruments 44,289.4 (465.4 ) (36,267.6 ) (3.9 ) 7,552.4 Unrealized profit on inventory 15,696.4 (3,038.2 ) 2,421.0 — 15,079.2 Others 7,985.3 2,346.5 689.5 (93.4 ) 10,927.9 Total deferred tax assets Rs. 165,823.4 Rs. 7,266.2 Rs. (34,449.9 ) (439.1 ) Rs. 138,200.6 Deferred tax liabilities: Property, plant and equipment 14,335.3 2,221.9 453.5 (158.7 ) 16,852.0 Intangible assets 104,848.9 5,305.1 11,657.1 27.4 121,838.5 Undistributed earnings of subsidiaries joint operations and equity accounted investees 13,376.3 5,081.6 * 939.3 — 19,397.2 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — — — 169.5 Derivative financial instruments 231.2 (611.5 ) 380.3 — — Others 446.9 (81.2 ) (132.9 ) (96.2 ) 136.6 Total deferred tax liabilities Rs. 133,408.1 Rs. 11,915.9 Rs. 13,297.3 (227.5 ) Rs. 158,393.8 Net assets/(liabilities) Rs. 32,415.3 Rs. (4,649.7 ) Rs. (47,747.2 ) (211.6 ) Rs. (20,193.2 ) Deferred tax assets Rs. 41,064.6 Deferred tax liabilities Rs. (61,257.8 ) * Net of Rs. 4,088.5 million reversed on dividend distribution by subsidiaries. Significant components of deferred tax assets and liabilities for the year ended March 31, 2017 are as follows: Opening Recognized in Recognized in /reclassified Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 19,432.6 Rs. 489.0 Rs. (0.6 ) Rs. 19,921.0 Business loss carry forwards 34,321.9 (4,177.0 ) (2,635.6 ) 27,509.3 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 33,149.5 (5,127.0 ) (1,198.3 ) 26,824.2 Compensated absences and retirement benefits 11,859.0 (6.2 ) 9,876.8 21,729.6 Minimum alternate tax carry-forward 582.6 166.6 — 749.2 Property, plant and equipment 2,109.3 (738.1 ) (252.2 ) 1,119.0 Derivative financial instruments 22,966.4 (1,283.3 ) 22,606.3 44,289.4 Unrealized profit on inventory 12,233.4 5,519.4 (2,056.4 ) 15,696.4 Others 5,745.0 3,044.4 (804.1 ) 7,985.3 Total deferred tax assets Rs. 142,399.7 Rs. (2,112.2 ) Rs. 25,535.9 Rs. 165,823.4 Deferred tax liabilities: Property, plant and equipment 16,117.2 (1,787.8 ) 5.9 14,335.3 Intangible assets 115,877.7 2,879.2 (13,908.0 ) 104,848.9 Undistributed earnings in subsidiaries, joint operations and equity accounted investees 13,436.3 480.7 * (540.7 ) 13,376.3 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — — 169.5 Derivative financial instruments 40.4 200.2 (9.4 ) 231.2 Others 624.1 (222.8 ) 45.6 446.9 Total deferred tax liabilities Rs. 146,265.2 Rs. 1,549.5 Rs. (14,406.6 ) Rs. 133,408.1 Net assets/(liabilities) Rs. (3,865.5 ) Rs. (3,661.7 ) Rs. 39,942.5 Rs. 32,415.3 Deferred tax assets Rs. 44,221.7 Deferred tax liabilities Rs. (11,806.4 ) * Net of Rs. 3,653.6 million reversed on dividend distribution by subsidiaries.

Debt

Debt	12 Months Ended
	Mar. 31, 2019
Short-term borrowings and current portion of long-term debt [Member]
Statement [line items]
Debt	Short-term borrowings and current portion of long-term debt Short-term borrowings and current portion of long-term debt consist of the following: As at March 31, 2019 2019 2018 (In millions) Commercial paper US$ 1,583.8 Rs. 109,525.6 Rs. 105,815.5 Loans from banks/financial institutions 1,319.5 91,247.0 61,273.0 Inter-corporate deposits 10.5 730.0 860.0 Current portion of long-term debt (refer note 21) 2,174.0 150,341.1 109,338.9 Total US$ 5,087.8 Rs. 351,843.7 Rs. 277,287.4
Long-term debt [Member]
Statement [line items]
Debt	Long-term debt Long-term debt consists of the following: As at March 31, 2019 2019 2018 (In millions) Non-convertible US$ 1,847.9 Rs. 127,793.8 Rs. 148,107.9 Collateralized debt obligations 440.7 30,473.3 13,205.8 Buyers credit from banks at floating interest rate 361.5 25,000.0 15,000.0 Loan from banks/financial institutions 4,039.8 279,380.1 137,181.5 Senior notes 5,536.1 382,845.6 396,301.9 Others 186.8 12,915.3 10,961.2 Total 12,412.8 858,408.1 720,758.3 Less: current portion (refer note 20) 2,174.0 150,341.1 109,338.9 Long-term debt US$ 10,238.8 Rs. 708,067.0 Rs. 611,419.4 Inventory, trade receivables, finance receivables, other financial assets, property, plant and equipment with a carrying amount of Rs. 308,850.5 million and Rs. 181,969.1 million are pledged as collateral/security against the borrowing as at March 31, 2019 and 2018, respectively. Collateralized debt obligations These represent amount received against finance receivables securitized/assigned, which do not qualify for derecognition. Non-convertible The interest rate on non-convertible Buyers credit The buyers line of credit from banks is repayable within four years from drawdown dates. Loan from banks / financial institutions Certain of the Company’s loans set limits on and/or require prior lender consent for, among other things, undertaking new projects, issuing new securities, changes in management, mergers, sales of undertakings and investment in subsidiaries. In addition, certain negative covenants may limit Company’s ability to borrow additional funds or to incur additional liens, and/or provide for increased costs in case of breach. Certain of the financing arrangements also include financial covenants to maintain certain debt-to-equity debt-to-earnings Long term loans from banks / financial institutions maturity is ranging from April 2019 to July 2023. Interest rate is based on marginal cost of funds lending rate (MCLR) for loans amounting to Rs. 220,311.8 million. Interest rate is based on LIBOR for loans amounting to Rs. 59,068.3 million. Commercial Paper Commercial paper are unsecured short term papers, issued at discount bearing no coupon interest. The yield on commercial paper issued by the company ranges from 7.21 % to 9.10 %. Senior notes (Euro MTF listed debt) The senior notes of Jaguar Land Rover Automotive Plc (JLR) are listed on the Euro MTF market, which is a listed market regulated by the Luxembourg Stock Exchange. Details of the tranches of the senior notes outstanding at March 31, 2019 are as follows: Issued on Currency Initial (in millions) Outstanding (in millions) Outstanding (In millions) Interest Redeemable on As at March 31, 2019 2018 January 2013 USD 500 500 Rs. 34,464.0 Rs. 32,485.2 5.625 % February 2023 February 2015 GBP 400 400 36,005.8 36,664.8 3.875 % March 2023 January 2014 GBP 400 400 35,969.8 36,598.4 5.000 % February 2022 March 2015 USD 500 500 34,686.5 32,713.6 3.500 % March 2020 December 2013 USD 700 — — 45,844.7 4.125 % December 2018 October 2014 USD 500 500 34,713.0 32,738.4 4.250 % November 2019 January 2017 GBP 300 300 27,036.8 27,504.6 2.750 % January 2021 January 2017 EUR 650 650 50,367.0 52,112.4 2.200 % January 2024 October 2017 USD 500 500 34,585.5 31,569.2 4.500 % March 2027 October 2018 USD 500 500 38,989.5 — 4.500 % January 2026 Total Rs. 326,817.9 Rs. 328,231.3 These senior notes are subject to customary covenants and events of defult, which include, among other things, restrictions or limitations on the amount of cash which can be transferred outside the Jaguar Land Rover group of companies in the form of dividends, loans or investments. Senior notes (SGX-ST The senior notes of Tata Motors Limited and TML Holdings Pte Ltd are listed on the SGX-ST Details of the tranches of the senior notes outstanding at March 31, 2019 are as follows: Issued on Currency Initial (in millions) Outstanding (in millions) Outstanding (In millions) Interest Redeemable on As at March 31, 2019 2018 October 2014 USD 250 250 Rs. 17,187.3 Rs. 16,194.3 5.750 % October 2024 May 2014 USD 300 300 20,791.6 19,487.7 5.750 % May 2021 October 2014 USD 500 262.532 18,048.8 32,388.6 4.625 % April 2020 Total Rs. 56,027.7 Rs. 68,070.6 For details of carrying amount of assets pledged as security for secured borrowings refer note 20

Other financial liabilities

Other financial liabilities	12 Months Ended
	Mar. 31, 2019
Other financial liabilities - current [Member]
Statement [line items]
Other financial liabilities	Other financial liabilities – current Other current financial liabilities consist of the following: As at March 31, 2019 2019 2018 (In millions) Liability towards vehicles sold under repurchase arrangements US$ 613.6 Rs. 42,436.5 Rs. 44,235.8 Interest accrued but not due 153.2 10,595.8 10,957.2 Lease liabilities 2.5 173.0 222.3 Derivative financial instruments 685.8 47,425.3 62,076.6 Unclaimed matured fixed deposits 1.1 73.4 107.7 Others 42.9 2,965.2 1,519.0 Total US$ 1,499.1 Rs. 103,669.2 Rs. 119,118.6
Other financial liabilities - non-current [Member]
Statement [line items]
Other financial liabilities	23. Other financial liabilities – non-current Other financial liabilities non-current As at March 31, 2019 2019 2018 (In millions) Lease liabilities US$ 22.6 Rs. 1,561.7 Rs. 467.5 Derivative financial instruments 385.0 26,624.4 24,502.0 Liability towards employee separation scheme 11.4 791.0 852.2 Retention money, security deposits and others 7.4 511.7 2,065.7 Total US$ 426.4 Rs. 29,488.8 Rs. 27,887.4

Provisions

Provisions	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Provisions	24. Provisions Provisions consist of the following: As at March 31, 2019 2019 2018 (In millions) Current Product warranty US$ 1,070.7 Rs. 74,042.5 Rs. 64,815.0 Legal and product liability 201.7 13,951.2 10,999.2 Provision for residual risk 12.3 851.2 622.0 Provision for environmental liability 18.1 1,254.7 978.8 Employee related and other provisions 171.7 11,867.9 * 2,003.5 Total-Current US$ 1,474.5 Rs. 101,967.5 Rs. 79,418.5 Non-current Product warranty US$ 1,460.1 Rs. 100,970.1 Rs. 94,521.6 Legal and product liability 56.6 3,913.1 2,199.5 Provision for residual risk 40.1 2,776.2 2,547.6 Provision for environmental liability 20.0 1,381.2 1,500.5 Employee benefits obligations 119.5 8,263.5 7,380.0 Other provisions 17.9 1,244.4 1,344.1 Total-Non-current US$ 1,714.2 Rs. 118,548.5 Rs. 109,493.3 *  Includes employee separation cost provision.    Year ended March 31, 2019 2019 2019 2019 Product Warranty Legal and product Liability (In millions) Balance at the beginning US$ 2,304.1 Rs. 159,336.6 US$ 190.9 Rs. 13,198.7 Adjustment on initial application of IFRS 15 (refer note 2(x)) (19.9 ) (1,376.5 ) — — Provision made during the year 1,507.3 104,237.0 * 211.9 14,654.8 Provision used during the year (1,244.9 ) (86,087.7 ) (142.5 ) (9,857.3 ) Impact of discounting 27.7 1,912.5 — — Currency translation (43.5 ) (3,009.3 ) (2.0 ) (131.9 ) Balance at the end US$ 2,530.8 Rs. 175,012.6 US$ 258.3 Rs. 17,864.3 Current US$ 1,070.7 Rs. 74,042.5 US$ 201.7 Rs. 13,951.2 Non-current US$ 1,460.1 Rs. 100,970.1 US$ 56.6 Rs. 3,913.1 *  Provision includes estimated recovery from suppliers Rs. (29.6) million.    Year ended March 31, 2019 2019 2019 2019 Provision for residual risk Provision for environmental liability (In millions) Balance at the beginning US$ 45.8 Rs. 3,169.6 US$ 35.9 Rs. 2,479.3 Provision made during the year 10.5 724.9 14.6 1,009.4 Provision used during the year (3.5 ) (239.5 ) (11.6 ) (799.3 ) Currency translation (0.4 ) (27.6 ) (0.8 ) (53.5 ) Balance at the end US$ 52.4 Rs. 3,627.4 US$ 38.1 Rs. 2,635.9 Current US$ 12.3 Rs. 851.2 US$ 18.1 Rs. 1,254.7 Non-current US$ 40.1 Rs. 2,776.2 US$ 20.0 Rs. 1,381.2

Other current liabilities

Other current liabilities	12 Months Ended
	Mar. 31, 2019
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Other current liabilities	Other current liabilities Other current liabilities consist of the following: As at March 31, 2019 2019 2018 (In millions) Contract liabilities (refer note 26 below) US$ 661.9 Rs. 45,773.8 Rs. 37,562.7 Statutory dues 566.0 39,139.0 31,768.3 Others 53.9 3,728.1 2,719.7 Total US$ 1,281.8 Rs. 88,640.9 Rs. 72,050.7 Statutory dues include goods and service tax, sales tax, excise duty and other taxes payable.

Other liabilities - non-current

Other liabilities - non-current	12 Months Ended
	Mar. 31, 2019
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Other liabilities - non-current	26. Other liabilities - non-current Other liabilities non-current As at March 31, 2019 2019 2018 (In millions) Employee benefit obligations US$ 883.5 Rs. 61,101.2 Rs. 41,007.6 Contract liabilities (refer note below) 675.7 46,730.9 41,116.2 Others 35.6 2,455.1 2,025.5 Total US$ 1,594.8 Rs. 110,287.2 Rs. 84,149.3 Note: (a) Statement showing movement of contract liabilities during the year Year ended March 31, 2019 (In millions) Opening contract liabilities (regrouped on transition to IFRS 15) 78,678.9 Transition impact of IFRS 15 2,766.9 Amount recognized in revenue during the year (35,783.9 ) Amount received in advance during the year 49,580.5 Amount refunded to customers during the year (2,175.5 ) Reversal of liabilities directly associated with assets held-for-sale 717.7 Currency translation (1,279.9 ) Balance at the end 92,504.7 Performance obligations in respect of amount received for future maintenance service and extended warranty will be fulfilled over a period of 6 years from year ending March 31, 2020 till March 31, 2025. (b) Contract liabilities comprise of the following: As at March 31, (In millions) Advances received from customers - current 17,396.1 Deferred revenue - current 28,377.7 Deferred revenue -Non-current 46,730.9 Total contract liabilities 92,504.7 Until the previous year, Advances received from customers and Deferred revenue were separately presented which currently as per IFRS 15 are presented as Contract liabilities.

Equity

Equity	12 Months Ended
	Mar. 31, 2019
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Equity	27. Equity Ordinary shares and ‘A’ Ordinary shares The movement of number of shares and share capital is as follows: Year ended March 31, Year ended March 31, 2019 2018 2017 Ordinary shares ‘A’ Ordinary shares Ordinary shares ‘A’ Ordinary shares Ordinary shares ‘A’ Ordinary shares No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) Shares at the beginning 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,428 Rs. 5,775.2 508,502,291 Rs. 1,017.0 2,887,203,602 Rs. 5,774.8 508,476,704 Rs. 1,017.0 Shares issued # — — — — 266 0.0 * 80 0.0 * 144,826 0.4 25,587 0.0 * Shares at the end 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,428 Rs. 5,775.2 508,502,291 Rs. 1,017.0 US$ 83.5 US$ 14.7 # Out of shares held in abeyance - Rights issue of 2001, 2008 and 2015. * Amounts less than Rs. 50,000 Authorized share capital Authorized share capital includes 4,000,000,000 Ordinary shares of Rs. 2 each as at March 31, 2019 (3,500,000,000 Ordinary shares of Rs. 2 each as at March 31, 2018 and 2017 ), 1,000,000,000 ‘A’ Ordinary shares of Rs. 2 each as at March 31, 2019 (1,000,000,000 ‘A’ Ordinary shares of Rs. 2 each as at March 31, 2018 and 2017) and 300,000,000 convertible cumulative preference shares of Rs. 100 each as at March 31, 2019 (300,000,000 convertible cumulative preference shares of Rs. 100 each as at March 31, 2018 and 2017). Issued and subscribed share capital Share issued includes partly paid up shares of 570 Ordinary shares of Rs. 2 each as at March 31,2019, 2018 and 2017, respectively. Ordinary shares and ‘A’ Ordinary shares: • The Company has two classes of shares – the Ordinary shares and the ‘A’ Ordinary shares both of Rs.2 each (together referred to as shares). In respect of every Ordinary share (whether fully or partly paid), voting rights shall be in the same proportion as the capital paid up on such Ordinary share bears to the total paid up Ordinary share capital of the Company. In case of every ‘A’ Ordinary share, if any resolution is put to vote on a poll or by postal ballot at any general meeting of shareholders, the holder shall be entitled to one vote for every ten ‘A’ Ordinary shares held as per the terms of its issue and if a resolution is put to vote on a show of hands, the holders of ‘A’ Ordinary shares shall be entitled to the same number of votes as available to holders of Ordinary shares. • Under the provisions of the revised Indian Listing Agreement with domestic Indian Stock Exchanges, every listed company is required to provide its shareholders with the facility to exercise their right to vote, by electronic means, either at a general meeting of the Company or by means of a postal ballot. • The dividend proposed by Tata Motors Limited’s Board of Directors is subject to the approval of the shareholders in the ensuing Annual General Meeting. Further, the Board of Directors may also announce an interim dividend which would need to be confirmed by the shareholders at the forthcoming Annual General Meeting. The holders of ‘A’ Ordinary shares shall be entitled to receive dividend for each financial year at five percentage point more than the aggregate rate of dividend declared on Ordinary shares for that financial year. • In the event of liquidation, the shareholders are eligible to receive the remaining assets of the Company after distribution of all preferential amounts, in proportion to their shareholdings.

Other components of equity

Other components of equity	12 Months Ended
	Mar. 31, 2019
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Other components of equity	28. Other components of equity (a) The movement of Currency translation reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 714.2 Rs. 49,388.8 Rs. (50,933.2 ) Rs. 45,936.6 Exchange differences arising on translating the net assets of foreign operations (net) (295.2 ) (20,414.1 ) 96,211.5 (93,822.8 ) Net change in translation reserve – equity accounted investees (net) (8.5 ) (586.1 ) 4,110.5 (3,047.0 ) Balance at the end US$ 410.5 Rs. 28,388.6 Rs. 49,388.8 Rs. (50,933.2 ) (b) The movement of Equity instruments held as fair value through other comprehensive income(FVTOCI) is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ — Rs. — Rs. Rs. Effect of transition to IFRS 9 (refer note 2(x)) 20.1 1,392.8 Other Comprehensive income for the year 6.3 438.1 — — Income tax relating to gain/(loss) recognized on equity investments, where applicable 0.1 3.9 — — Profit on sale of equity investments reclassified to retained earnings (0.7 ) (49.3 ) — — Balance at the end US$ 25.8 Rs. 1,785.5 Rs. — Rs. — (c) The movement of Available-for-sale Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 20.6 Rs. 1,422.1 Rs. 1,062.8 Rs. 274.6 Effect of transition to IFRS 9 (refer note 2(x)) (20.6 ) (1,422.1 ) Gain/(loss) arising on revaluation of available-for-sale — — 565.8 905.6 Income tax relating to gain/loss arising on revaluation of available-for-sale — — (16.2 ) (16.0 ) Cumulative (gain)/loss reclassified to profit or loss on available-for-sale — — (169.2 ) (143.9 ) Income tax relating to cumulative gain/loss reclassified to profit or loss on available-for-sale — — 45.2 42.5 Net change in share of available-for-sale — — (66.3 ) — Balance at the end US$ — Rs. — Rs. 1,422.1 Rs. 1,062.8 (d) The movement of Hedging reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ (567.2 ) Rs. (39,224.0 ) Rs. (206,143.3 ) Rs. (84,860.0 ) Effect of transition to IFRS 9 (refer note 2(x)) (40.8 ) (2,819.8 ) — 659.5 Gain/(loss) recognized on cash flow hedges (1,298.9 ) (89,824.6 ) 104,219.6 (258,874.4 ) Income tax relating to gain/loss recognized on cash flow hedges 245.5 16,974.8 (19,598.8 ) 49,566.0 (Gain)/loss reclassified to profit or loss 1,155.4 79,903.6 101,603.1 109,106.8 Income tax relating to gain/loss reclassified to profit or loss (219.5 ) (15,181.1 ) (19,304.6 ) (21,741.2 ) Amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges (187.4 ) (12,959.4 ) — — Tax on amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges 35.7 2,462.3 — — Balance at the end US$ (877.2 ) Rs. (60,668.2 ) Rs. (39,224.0 ) Rs. (206,143.3 ) (e) The movement of Cost of Hedging reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ (64.7 ) Rs. (4,473.1 ) Rs. (6,704.6 ) Rs. — Effect of transition to IFRS 9 (refer note 2(x)) 3.0 204.8 — (3,140.5 ) Gain/(loss) recognized on cash flow hedges (10.8 ) (746.6 ) 1,873.5 (4,084.8 ) Income tax relating to gain/loss recognized on cash flow hedges 3.0 207.5 (398.2 ) 752.1 (Gain)/loss reclassified to profit or loss 9.5 659.3 933.6 (289.3 ) Income tax relating to gain/loss reclassified to profit or loss (1.8 ) (125.3 ) (177.4 ) 57.9 Amounts removed from hedge reserve and recognized in inventory 25.0 1,727.8 — — Income tax related to amounts removed from hedge reserve and recognized in inventory (4.7 ) (328.3 ) — — Balance at the end US$ (41.5 ) Rs. (2,873.9 ) Rs. (4,473.1 ) Rs. (6,704.6 ) (f) Summary of Other components of equity: Year ended March 31, 2019 2019 2018 2017 (In millions) Currency translation reserve US$ 410.5 Rs. 28,388.6 Rs. 49,388.8 Rs. (50,933.2 ) Available-for-sale — — 1,422.1 1,062.8 Investments reserve 25.8 1,785.5 — — Hedging reserve (877.2 ) (60,668.2 ) (39,224.0 ) (206,143.3 ) Cost of hedge reserve (41.6 ) (2,873.9 ) (4,473.1 ) (6,704.6 ) Total US$ (482.5 ) Rs. (33,368.0 ) Rs. 7,113.8 Rs. (262,718.3 )

Notes to reserves and dividends

Notes to reserves and dividends	12 Months Ended
	Mar. 31, 2019
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Notes to reserves and dividends	Notes to reserves and dividends Additional paid-in The amount received in excess of face value of the equity shares is recognized in additional paid-in Retained earnings Retained earnings are the profits that the Company has earned till date. Capital redemption reserve The Companies Act requires that where a company purchases its own shares out of free reserves or securities premium account, a sum equal to the nominal value of the shares so purchased shall be transferred to a capital redemption reserve account and details of such transfer shall be disclosed in the balance sheet. The capital redemption reserve account may be applied by the company, in paying up unissued shares of the company to be issued to shareholders of the company as fully paid bonus shares. Tata Motors Limited established this reserve pursuant to the redemption of preference shares issued in earlier years. Debenture redemption reserve The Companies Act requires that where a company issues debentures, it shall create a debenture redemption reserve out of profits of the Company available for payment of dividend. The Company is required to maintain a Debenture Redemption Reserve of 25% of the value of debentures issued, either by a public issue or on a private placement basis. The amounts credited to the debenture redemption reserve may not be utilized by the Company except to redeem debentures. Reserve for research and human resource development In terms of Article 9 of the Act on Special Taxation Restriction in Korea, Tata Daewoo Commercial Vehicle Company Limited (TDCV, a subsidiary of Tata Motors Limited) is entitled for deferment of tax in respect of expenditures incurred on product development cost subject to fulfillment of certain conditions, by way of deduction from the taxable income, provided that TDCV appropriates an equivalent amount from “Retained Earnings” to “Reserve for Research and Human Resource Development”. The deferment is for a period of three years and from the fourth year onwards one-third Special reserve The special reserve represents the reserve created by two subsidiaries of Tata Motors Limited pursuant to the Reserve Bank of India Act, 1934 (the “RBI Act”) and related regulations applicable to those companies. Under the RBI Act, a non-banking Earned surplus reserve Under the Korean commercial code, TDCV is required to appropriate at least 10% of cash dividend declared each year to a legal reserve until such reserves equal to 50% of capital stock. This reserve may not be utilized for cash dividends, but may only be used to offset against future deficits, if any, or may be transferred to capital stock. Hedge Reserve Effective portion of fair value gain/(loss) on all financial insturments designated in cash flow hedge relationship are accumulated in hedge reserve. Cost of hedge reserve Fair value gain/(loss) attributable to cost of hedge on all financial instruments designated in cash flow hedge relationship are accumulated in cost of hedge reserve. Dividends The final dividend is recommended by the Board of Directors and is recorded in the books of account upon its approval by the shareholders. For the year ended March 31, 2019, 2018 and 2017, considering the accumulated losses in the Tata Motors Limited standalone financial statements, no dividend was permitted to be paid to the members, as per the Companies Act, 2013 and the rules framed thereunder. Share-based payments reserve Share-based payments reserve represents amount of fair value, as on the date of grant, of unvested options and vested options not exercised till date, that have been recognized as expense in the income statement till date . Reserve for equity investments through other comprehensive income Fair value gain / (loss) arising on equity investments that are designated as held at fair value through other comprehensive income is included here.

Revenue

Revenue	12 Months Ended
	Mar. 31, 2019
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Revenue	30. Revenue Revenue for fiscal 2019 consists of the following: Year ended March 31, 2019 2019 (In millions) Sale of products - Sale of vehicles US$ 37,260.1 Rs. 2,576,720.5 - Sale of spare parts 3,476.3 240,405.0 - Sale of miscellaneous products 1,655.0 114,449.7 Sale of Services 406.2 28,091.7 Others (Incentives) (refer note 2(x)) — — Total US$ 42,797.6 Rs. 2,959,666.9

Employee cost

Employee cost	12 Months Ended
	Mar. 31, 2019
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Employee cost	31. Employee cost Employee cost consists of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Salaries, wages and welfare expenses US$ 4,589.8 Rs. 317,406.0 Rs. 270,441.8 Rs. 255,325.7 Contribution to provident fund and other funds 417.2 28,855.1 32,183.0 28,262.3 Total US$ 5,007.0 Rs. 346,261.1 Rs. 302,624.8 Rs. 283,588.0 Share based payments Long Term Incentive Plan A subsidiary of the Company operates a Long Term Incentive Plan (LTIP) arrangement for certain employees. The scheme provides a cash payment to the employee based on a specific number of phantom shares at grant and the share price of Tata Motors Limited at the vesting date. The cash payment is dependent on the performance of the underlying shares of Tata Motors Limited over the 3 year vesting period and continued employment at the end of the vesting period. The fair value of the awards is calculated using a Black-Scholes model at the grant date. The fair value is updated at each reporting date as the awards are accounted for as cash-settled plan. The inputs into the model are based on the Tata Motors Limited historic data, the risk-free rate and the weighted average fair value of shares, in the scheme at the reporting date. During the year ended March 31, 2016, the subsidiary company issued its final LTIP based on the share price of Tata Motors Limited. The amount recognized in relation to the LTIP was Rs. 91.8 million, Rs. 85.5 million and Rs. 701.3 million for the years ended March 31, 2019, 2018 and 2017, respectively. The Company considers these amounts as insignificant and accordingly has not provided further disclosures as required by IFRS 2 “Share-based Payment”. Employee Stock Options The Company has alloted stock options to certain employees during the year ended March 31, 2019, under Tata Motors Limited Employee Stock Options Scheme 2018 approved by the Nomination and Remuneration Committee (NRC). As per the scheme, the number of shares that will vest is conditional upon certain performance measures determined by NRC. The performance is measured over vesting period of the options granted which ranges from 3 to 5 years. Service period ranges from 3 to 5 years and the options would not vest with the employees if employment is discontinued with the Company or any Tata Company before vesting. The performance measures under this scheme include growth in sales, earnings and Free Cash Flow. The options granted under this scheme are exercisable by employees till one year from date of its vesting. The Company has granted 78,12,427 number of options during the year ended March 31, 2019 at an exercise price of ₹ Year ended Options outstanding at the beginning of the year — Granted during the year 7,812,427 Forfeited/Expired during the year — Exercised during the year — Outstanding at the end of the year 7,812,427 Maximum/Minimum number of shares to be issued for outstanding options (conditional on performance measures) 11,718,641/3,906,214 The Company has estimated fair value of options using Black Scholes model and recognized an amount of Rs. 84.4 million in employee cost. The following assumptions were used for calculation of fair value of options granted during the year ended March 31, 2019. Assumption factor Estimate Risk free rate 7%-8% Expected life of option 4-6 Expected volatility 33%-37%

Other expenses

Other expenses	12 Months Ended
	Mar. 31, 2019
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Other expenses	32. Other expenses Other expenses consist of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Stores, spare parts and tools consumed US$ 353.4 Rs.24,441.5 Rs.22,105.6 Rs.24,191.1 Freight and transportation expenses (refer note 2(x)) 1,128.5 78,044.7 114,840.9 103,534.4 Research and product development cost 610.9 42,245.7 35,318.7 34,135.7 Warranty and product liability expenses 1,719.6 118,921.4 69,978.9 85,866.4 Allowance for trade and other receivables, and finance receivables 77.3 5,344.3 400.9 7,359.5 Works operation and other expenses 3,747.1 259,133.9 261,407.3 232,674.8 Repairs to building and plant and machinery 88.4 6,115.7 6,189.7 6,273.2 Processing charges 236.3 16,343.6 13,390.8 11,720.3 Power and fuel 229.3 15,859.3 13,080.8 11,598.2 Insurance 51.4 3,552.3 3,355.9 4,121.2 Publicity 1,262.5 87,296.3 89,685.9 86,986.8 Total US$ 9,504.7 Rs.657,298.7 Rs.629,755.4 Rs.608,461.6

Other income_(loss) (net)

Other income/(loss) (net)	12 Months Ended
	Mar. 31, 2019
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Other income/(loss) (net)	Other income/(loss) (net) Other income/(loss) (net) consist of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Miscellaneous income US$ 245.0 Rs.16,941.8 Rs.32,508.0 Rs.25,143.9 Incentives 145.1 10,035.3 11,499.6 3,331.1 Gain / (Loss) on change in fair value of commodity derivatives 12.3 847.5 2,146.3 9,184.0 Dividend income and income on mutual funds 2.5 172.8 157.7 105.1 Gain/(loss) on sale, change in fair value of available-for-sale — — 1,561.7 1,826.0 Profit on sale of investments measured at FVTPL 18.6 1,286.1 — — Profit on sale of investment in a subsidiary company (note below) 54.5 3,769.8 — — MTM on investments measured at FVTPL 34.5 2,385.4 — — Total US$ 512.5 Rs.35,438.7 Rs.47,873.3 Rs.39,590.1 Note: During the year ended March 31, 2019, the Company has sold investment in TAL Manufacturing Solutions Limited to Tata Advanced Systems Ltd.

Interest expense (net)

Interest expense (net)	12 Months Ended
	Mar. 31, 2019
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Interest expense (net)	Interest expense (net) Interest expense (net) consists of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Gross interest expense US$ 1,051.5 Rs.72,714.5 Rs.59,734.5 Rs.55,306.7 Less: Interest capitalized * (218.8 ) (15,128.5 ) (12,943.2 ) (12,941.0 ) Total US$ 832.7 Rs.57,586.0 Rs.46,791.3 Rs.42,365.7 * Represents borrowing costs capitalized during the year on qualifying assets (property plant and equipment and product development). The weighted average rate for capitalization of interest relating to general borrowings was approximately 5.4%, 4.3% and 4.4% for the years ended March 31, 2019, 2018 and 2017, respectively.

Employee benefits

Employee benefits	12 Months Ended
	Mar. 31, 2019
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Employee benefits	35. Employee benefits Defined Benefit Plan Pension and post retirement medical plans The following table sets out the funded and unfunded status and the amounts recognized in the financial statements for the pension and the post retirement medical plans in respect of Tata Motors, its Indian subsidiaries and joint operations: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Change in defined benefit obligations : Defined benefit obligation, beginning of the year US$ 148.2 Rs. 10,247.9 Rs. 9,807.6 US$ 22.3 Rs. 1,540.5 Rs. 1,838.6 Current service cost 10.8 746.3 722.5 1.2 80.4 102.0 Interest cost 10.9 757.0 687.6 1.7 115.1 130.6 Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions (0.2 ) (11.9 ) (160.3 ) — — (114.0 ) Actuarial (gains) / losses arising from changes in financial assumptions 2.1 141.9 228.8 1.2 81.1 (27.0 ) Actuarial (gains) / losses arising from changes in experience adjustments 8.6 592.7 105.0 (2.2 ) (150.3 ) (289.6 ) Benefits paid from plan assets (10.3 ) (713.1 ) (1,168.5 ) — — — Benefits paid directly by employer (0.8 ) (58.2 ) (59.8 ) (1.4 ) (94.2 ) (100.1 ) Past service cost plan amendment 0.1 3.9 85.0 (0.3 ) (19.9 ) — Acquisition/(Divestment) (0.3 ) (23.9 ) — (0.3 ) (18.7 ) — Defined benefit obligation, end of the year US$ 169.1 Rs. 11,682.6 Rs. 10,247.9 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5 Change in plan assets: Fair value of plan assets, beginning of the year US$ 131.1 Rs. 9,060.4 Rs. 8,417.8 US$ — Rs. — Rs. — Interest income 10.4 716.0 633.3 — — — Remeasurements gains / (losses) Return on plan assets, (excluding amount included in net Interest cost) 0.4 27.0 (26.9 ) — — — Employer’s contributions 17.0 1,172.6 1,204.7 — — — Benefits paid (10.3 ) (713.1 ) (1,168.5 ) — — — Acquisition/(Divestment) (0.2 ) (12.5 ) — Fair value of plan assets, end of the year US$ 148.4 Rs. 10,250.4 Rs. 9,060.4 US$ — Rs. — Rs. — As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Amount recognized in the balance sheet consists of: Present value of defined benefit obligation US$ 169.1 Rs. 11,682.6 Rs. 10,247.9 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5 Fair value of plan assets 148.4 10,250.4 9,060.4 — — — Net liability US$ (20.7 ) Rs. (1,432.2 ) Rs. (1,187.5 ) US$ (22.2 ) Rs. (1,534.0 ) Rs. (1,540.5 ) Amounts in the balance sheet: Non–current assets US$ 0.2 Rs. 16.4 15.7 US$ — Rs. — Rs. — Non–current liabilities (20.9 ) (1,448.6 ) (1,069.8 ) (22.2 ) (1,534.0 ) (1,420.1 ) Liabilities for assets classified as held for sale — — (133.4 ) — — (120.4 ) Net liability US$ (20.7 ) Rs. (1,432.2 ) Rs. (1,187.5 ) US$ (22.2 ) Rs. (1,534.0 ) Rs. (1,540.5 ) Total amount recognized in other comprehensive income consists of: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ 44.4 Rs. 3,068.2 Rs. 2,372.5 Rs. 2,172.1 US$ (1.7 ) Rs. (120.9 ) Rs. (51.7 ) Rs. 378.9 US$ 44.4 Rs. 3,068.2 Rs. 2,372.5 Rs. 2,172.1 US$ (1.7 ) Rs. (120.9 ) Rs. (51.7 ) Rs. 378.9 Information for funded plans with a defined benefit obligation in excess of plan assets: As at March 31, Pension benefits 2019 2019 2018 (In millions) Defined benefit obligation US$ 142.2 Rs. 9,837.0 Rs. 1,410.8 Fair value of plan assets US$ 139.0 Rs. 9,612.3 Rs. 1,262.9 Information for funded plans with a defined benefit obligation less than plan assets: As at March 31, Pension benefits 2019 2019 2018 (In millions) Defined benefit obligation US$ 9.0 Rs. 621.7 Rs. 7,781.8 Fair value of plan assets US$ 9.2 Rs. 638.1 Rs. 7,797.5 Information for unfunded plans: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Defined benefit obligation US$ 17.7 Rs. 1,223.9 Rs. 1,055.3 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5 Net pension and post retirement medical cost consist of the following components: Year ended March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Service cost US$ 10.8 Rs. 746.3 Rs. 722.5 Rs. 657.1 US$ 1.2 80.4 Rs. 102.0 Rs. 81.9 Past Service cost— Plan amendment 0.1 3.9 85.0 — (0.3 ) (19.9 ) — — Net interest cost / (income) 0.5 41.0 54.3 94.6 1.6 115.1 130.6 123.3 Net periodic cost US$ 11.4 Rs. 791.2 Rs. 861.8 Rs. 751.7 US$ 2.5 Rs. 175.6 Rs. 232.6 Rs. 205.2 Other changes in plan assets and benefit obligation recognized in other comprehensive income. Year ended March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Return on plan assets, (excluding amount included in net Interest expense) US$ (0.4 ) Rs. (27.0 ) Rs. 26.9 Rs. (264.1 ) US$ — Rs. — Rs. — Rs. — Actuarial (gains) / losses arising from changes in demographic assumptions (0.2 ) (11.9 ) (160.3 ) (9.6 ) — — (114.0 ) 21.7 Actuarial (gains) / losses arising from changes in financial assumptions 2.1 141.9 228.8 160.1 1.2 81.1 (27.0 ) 218.2 Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 8.6 592.7 105.0 (65.0 ) (2.2 ) (150.3 ) (289.6 ) (104.6 ) Total recognized in other comprehensive income US$ 10.1 Rs. 695.7 Rs. 200.4 Rs. (178.6 ) US$ (1.0 ) Rs. (69.2 ) Rs. (430.6 ) Rs. 135.3 Total recognized in income statement and statement of other comprehensive income US$ 21.5 Rs. 1,486.9 Rs. 1,062.2 Rs. 573.1 US$ 1.5 Rs. 106.4 Rs. (198.0 ) Rs. 340.5 The assumptions used in accounting for the pension and post retirement medical plans are set out below: As at March 31, Pension benefits Post retirement medical benefits 2019 2018 2017 2019 2018 2017 Discount rate 6.75% - 7.70% 7.50% - 8.00% 6.75% - 7.50% 7.60% 8.00% 7.30% Rate of increase in compensation level of covered employees 5.75% - 12.0% 5.00% - 12.00% 4.00% - 11.00% NA NA NA Increase in health care cost NA NA NA 6.00% 6.00% 6.00% Plan Assets The fair value of Company’s pension plan asset as of March 31, 2019 and 2018 by category are as follows: Pension benefits Plan assets as of March 31 2019 2018 Asset category: Cash and cash equivalents 6.5 % 6.0 % Debt instruments (quoted) 66.9 % 68.4 % Debt instruments (unquoted) 0.9 % 0.3 % Equity instruments (quoted) 2.6 % 1.7 % Deposits with Insurance companies 23.1 % 23.6 % 100.0 % 100.0 % The Company’s policy is driven by considerations of maximizing returns while ensuring credit quality of the debt instruments. The asset allocation for plan assets is determined based on investment criteria prescribed under the Indian Income Tax Act, 1961, and is also subject to other exposure limitations. The Company evaluates the risks, transaction costs and liquidity for potential investments. To measure plan asset performance, the Company compares actual returns for each asset category with published bench marks. The weighted average duration of the defined benefit obligation as at March 31, 2019 is 14.41 years (2018 : 14.51 years) The Company expects to contribute Rs. 966.7 million to the funded pension plans in Fiscal 2020. The table below outlines the effect on the service cost, the interest cost and the defined benefit obligation in the event of a decrease/increase of 1% in the assumed rate of discount rate, salary escalation and health care cost: Assumption Change in assumption Impact on defined benefit Impact on service cost and Discount rate Increase by 1% Decrease by 1% Decrease by Rs. 845.5 million Increase by Rs. 951.2 million Decrease by Rs. 193.4 million Increase by Rs. 206.2 million Salary escalation rate Increase by 1% Decrease by 1% Increase by Rs. 913.1 million Decrease by Rs. 810.2 million Increase by Rs. 216.6 million Decrease by Rs. 190.3 million Health care cost Increase by 1% Decrease by 1% Increase by Rs. 193.4 million Decrease by Rs.162.6 million Increase by Rs. 42.7 million Decrease by Rs. 39.7 million Severance indemnity plan Severance indemnity is a funded plan of Tata Daewoo Commercial Vehicles Limited (TDCV), a subsidiary of Tata Motors Limited. The following table sets out, the amounts recognized in the financial statements for the severance indemnity plan. As at March 31, 2019 2019 2018 (In millions) Change in defined benefit obligation: Defined benefit obligation, beginning of the year US$ 61.5 Rs. 4,256.3 Rs. 3,482.6 Service cost 7.6 525.2 452.6 Interest cost 1.6 111.3 79.0 Remeasurements (gains) / losses - Actuarial (gains) / losses arising from changes in financial assumptions 5.3 368.3 (1.4 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities (3.1 ) (213.4 ) 147.0 Benefits paid from plan assets (10.7 ) (738.9 ) (70.8 ) Benefits paid directly by employer (1.3 ) (89.5 ) (34.9 ) Foreign currency translation 0.1 4.0 202.2 Defined benefit obligation, end of the year US$ 61.0 Rs. 4,223.3 Rs. 4,256.3 Change in plan assets: Fair value of plan assets, beginning of the year US$ 58.6 4,053.6 3,245.3 Interest income 1.6 109.7 81.5 Remeasurements gain / (loss) Return on plan assets, (excluding amount included in net Interest expense) (0.9 ) (59.9 ) (51.3 ) Employer’s contributions 3.2 219.7 656.4 Benefits paid (10.7 ) (738.9 ) (70.8 ) Foreign currency translation 0.2 16.5 192.5 Fair value of plan assets, end of the year US$ 52.0 Rs. 3,600.7 Rs. 4,053.6 As at March 31, 2019 2019 2018 (In millions) Amount recognized in the balance sheet consist of: Present value of defined benefit obligation US$ 61.0 Rs. 4,223.3 Rs. 4,256.3 Fair value of plan assets 52.0 3,600.7 4,053.6 Net liability US$ (9.0 ) Rs. (622.6 ) Rs. (202.7 ) Amounts in the balance sheet: Non- US$ (9.0 ) Rs. (622.6 ) Rs. (202.7 ) Total amount recognized in other comprehensive income for severance indemnity consists of: As at March 31, 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ (5.7 ) Rs. (396.3 ) Rs. (611.1 ) Rs. (808.0 ) US$ (5.7 ) Rs. (396.3 ) Rs. (611.1 ) Rs. (808.0 ) Net severance indemnity cost consist of the following components: Year ended March 31, 2019 2019 2018 2017 (In millions) Service cost US$ 7.6 Rs. 525.2 Rs. 452.6 Rs. 486.2 Net interest cost — 1.6 (2.5 ) 7.6 Net periodic pension cost US$ 7.6 Rs. 526.8 Rs. 450.1 Rs. 493.8 Other changes in plan assets and benefit obligation recognized in other comprehensive income for severance indemnity plan: As at March 31, 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Return on plan assets, (excluding amount included in net Interest expense) US$ 0.9 Rs. 59.9 Rs. 51.3 Rs. 25.4 Actuarial (gains) / losses arising from changes in financial assumptions 5.3 368.3 (1.4 ) (156.5 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities (3.1 ) (213.4 ) 147.0 (195.3 ) Total recognized in other comprehensive income US$ 3.1 Rs. 214.8 Rs. 196.9 Rs. (326.4) Total recognized in income statement and other comprehensive income US$ 10.7 Rs. 741.6 Rs. 647.0 Rs. 167.4 The assumptions used in accounting for the Severance indemnity plan is set out below: As at March 31, 2019 2018 2017 Discount rate 2.0 % 2.8 % 2.3 % Rate of increase in compensation level of covered employees 3.5 % 3.5 % 3.0 % The table below outlines the effect on the service cost, the interest cost and the defined benefit obligation in the event of a decrease/increase of 1% in the assumed rate of discount rate, salary escalation rate: Assumption Change in assumption Impact on defined benefit obligation Impact on service cost and interest cost Discount rate Increase by 1% Decrease by 1% Decrease by Rs. 440.1 millions Increase by Rs. 516.2 millions Decrease by Rs. 123.2 millions Increase by Rs. 135.6 millions Salary escalation rate Increase by 1% Decrease by 1% Increase by Rs. 503.0 millions Decrease by Rs. 438.2 millions Increase by Rs. 148.6 millions Decrease by Rs. 128.4 millions Severance indemnity plans asset allocation by category is as follows: As at March 31, 2019 2018 Deposit with banks 100% 100% The weighted average duration of the defined benefit obligation as at March 31, 2019 is 11.0 years (2018 : 10.7 years) The Company expects to contribute Rs. 179.1 million to the funded severance indemnity plans in Fiscal 2020. Jaguar Land Rover Pension plan Jaguar Land Rover Ltd UK, have pension arrangements providing for qualifying employees with defined benefits related to pay and service as set out in the rules of each fund. The UK defined benefit schemes are administered by a separate fund that is legally separated from the Company. The trustees of the pension scheme, are required by law to act in the interest of the fund, and of all relevant stakeholders in the scheme, and are responsible for the investment policy with regard to the assets of the schemes and all other governance matters. The board of trustees must be composed of representatives of the Company and plan participants in accordance with the plan’s regulations. Through its defined benefit pension plans, the Company is exposed to a number of risks, the most significant of which are detailed below : Asset volatility The plan liabilities are calculated using a discount rate set with references to corporate bond yields; if plan assets under perform compared to the corporate bonds discount rate, this will create or increase a deficit. The defined benefit plans hold a significant proportion of equity type assets, which are expected to outperform corporate bonds in the long-term while providing volatility and risk in the short-term. As the plans mature, the Company intends to reduce the level of investment risk by investing more in assets that better match the liabilities. However, the Company believes that due to the long-term nature of the plan liabilities and the strength of the supporting group, a level of continuing equity type investments is an appropriate element of the Company’s long term strategy to manage the plans efficiently. Changes in bond yields A decrease in corporate bond yields will increase plan liabilities, although this is expected to be partially offset by an increase in the value of the plans’ bond holdings and interest rate hedging instruments. Inflation risk Some of the Company’s pension obligations are linked to inflation, and higher inflation will lead to higher liabilities (although, in most cases, caps on the level of inflationary increases are in place to protect the plan against high inflation). The plans hold a significant proportion of assets in index linked gilts, together with other inflation hedging instruments and also assets which are more closely correlated with inflation. However an increase in inflation will also increase the deficit to some degree. Life expectancy The majority of the plan’s obligations are to provide benefits for the life of the member, so increases in life expectancy will result in an increase in the plan’s liabilities. This is particularly significant in the UK defined benefit plans, where inflationary increases result in higher sensitivity to changes in life expectancy. The following table sets out the disclosure pertaining to employee benefits of Jaguar Land Rover Limited As at March 31, Pension benefits 2019 2019 2018 (In millions) Change in defined benefit obligation: Defined benefit obligation, beginning of the year US$ 11,102.6 Rs. 767,800.4 Rs. 806,676.9 Service cost 209.5 14,490.5 18,561.3 Interest cost 286.5 19,814.7 20,584.3 Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions (65.5 ) (4,533.1 ) (17,990.4 ) Actuarial (gains) / losses arising from changes in financial assumptions 718.0 49,653.7 (30,177.8 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 47.4 3,276.9 (8,487.5 ) Past service cost/(credit) 54.9 3,799.0 (36,090.1 ) Plan settlement — — (1,807.6 ) Benefits paid (818.1 ) (56,573.7 ) (84,441.3 ) Member contributions 2.0 135.8 324.8 Foreign currency translation (219.8 ) (15,199.3 ) 100,647.8 Defined benefit obligation, end of the year US$ 11,317.5 Rs. 782,664.9 Rs. 767,800.4 Change in plan assets: Fair value of plan assets, beginning of the year US$ 10,518.1 Rs. 727,378.9 Rs. 688,454.9 Interest Income 275.3 19,040.2 18,661.3 Remeasurements gains / (losses) Return on plan assets, (excluding amount included in net Interest expense) 341.6 23,626.2 (9,974.6 ) Employer’s contributions 348.2 24,078.1 24,554.2 Members contributions 2.0 135.8 324.8 Plan settlement — — (1,749.5 ) Benefits paid (818.1 ) (56,573.7 ) (84,441.3 ) Expenses paid (17.2 ) (1,186.5 ) (777.7 ) Foreign currency translation (203.9 ) (14,098.0 ) 92,326.9 Fair value of plan assets, end of the year US$ 10,446.0 Rs. 722,401.0 Rs. 727,378.9 As at March 31, Pension benefits 2019 2019 2018 (In millions) Amount recognized in the balance sheet consist of: Present value of defined benefit obligation US$ 11,317.5 Rs. 782,664.9 Rs. 767,800.4 Fair value of plan Assets 10,446.0 722,401.0 727,378.9 Net liability US$ (871.5 ) Rs. (60,263.9 ) Rs. (40,421.5 ) Amount recognized in the balance sheet consist of: Non- US$ — Rs. — Rs. — Non -current liabilities (871.5 ) (60,263.9 ) (40,421.5 ) Net liability US$ (871.5 ) Rs. (60,263.9 ) Rs. (40,421.5 ) Total amount recognized in other comprehensive income consists of: As at March 31, Pension benefits 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ 2,212.2 Rs. 152,983.4 Rs. 128,212.1 Rs. 174,893.2 Restriction of Pension asset (as per IFRIC 14) (201.4 ) (13,928.1 ) (13,928.1 ) (13,928.1 ) Onerous obligation, excluding amounts included in interest expenses (125.1 ) (8,650.4 ) (8,650.4 ) (8,650.4 ) US$ 1,885.7 Rs. 130,404.9 Rs. 105,633.6 Rs. 152,314.7 Net pension and post retirement cost consist of the following components: Year ended March 31, Pension benefits 2019 2019 2018 2017 (In millions) Current service cost US$ 209.5 Rs. 14,490.5 Rs. 18,561.3 Rs. 17,357.3 Past service cost/(credit) 54.9 3,799.0 (36,090.1 ) — Administrative expenses 17.2 1,186.5 777.7 789.0 Plan settlement — — (58.1 ) — Net interest cost / (income) (including onerous obligations) 11.2 774.5 1,923.0 1,490.3 Net periodic pension cost US$ 292.8 Rs. 20,250.5 Rs. (14,886.2 ) Rs. 19,636.6 Amount recognized in other comprehensive income Year ended March 31, Pension benefits 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions US$ (65.5 ) Rs. (4,533.1 ) Rs. (17,990.4 ) Rs. (6,662.4 ) Actuarial (gains) / losses arising from changes in financial assumptions 718.0 49,653.7 (30,177.8 ) 204,693.3 Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 47.4 3,276.9 (8,487.5 ) (18,672.2 ) Return on plan assets, (excluding amount included in net Interest expense) (341.6 ) (23,626.2 ) 9,974.6 (100,724.9 ) Change in onerous obligation, excluding amounts included in interest expenses — — — (175.3 ) Total recognized in other comprehensive income US$ 358.3 Rs. 24,771.3 Rs. (46,681.1 ) Rs. 78,458.5 Total recognized in income statement and other comprehensive income US$ 651.1 Rs. 45,021.8 Rs. (61,567.3 ) Rs. 98,095.1 The assumptions used in accounting for the pension plans are set out below: As at March 31, Pension benefits 2019 2018 2017 Discount rate 2.4 % 2.70 % 2.60 % Expected rate of increase in compensation level of covered employees 2.4 % 2.30 % 3.70 % Inflation increase 3.2 % 3.10 % 3.20 % The assumed life expectations on retirement at age 65 are (years) Retiring today : Males 21.0 21.3 21.5 Females 23.2 23.4 24.5 Retiring in 20 years : Males 22.4 22.5 23.3 Females 25.1 25.1 26.3 For the valuation as at March 31, 2019, the mortality assumptions used are the SAPS table, in particular S2PxA tables and the Light Table for members of the Jaguar Executive Pension Plan. For the Jaguar Pension Plan, scaling factor of 112% to 118% have been used for male members and scaling factor of 101% to 112% have been used for female members. For the Land Rover Pension Scheme, scaling factor of 107% to 112% have been used for male members and scaling factor of 101% to 109% have been used for female members. For the Jaguar Executive Pension Plan, an average scaling factor of 94% has been used for male members and an average scaling factor of 84% has been used for female members. For the valuation at March 31, 2018, the mortality assumptions used are the SAPS based table, in particular S2PxA tables and the Light table for members of the Jaguar Executive Pension Plan. For the Jaguar Pension Plan, scaling factors of 113 % to 119 % have been used for male members and scaling factors of 102 % to 114 % have been used for female members. For the Land Rover Pension Scheme, scaling factors of 108 % to 113 % have been used for male members and scaling factors of 102 % to 111 % have been used for female members. For the Jaguar Executive Pension Plan, an average scaling factor of 95 % has been used for male members and an average scaling factor of 85 % has been used for female members. For the valuation at March 31, 2017 the mortality assumptions used are the SAPS base table, in particular S2NxA tables and the Light table for members of the Jaguar Executive Pension Plan. A scaling factor of 120% for males and 110% for females has been used for the Jaguar Pension Plan, 115% for males and 105% for females for the Land Rover Pension Scheme and 95% for males and 85% for females for Jaguar Executive Pension Plan. There is an allowance for future improvements in line with the CMI (2018) projections and an allowance for long-term improvements of 1.25% per annum (2018, CMI (2017) projections with 1.25% per annum improvements). Pension plans asset allocation by category is as follows: As at March 31, 2019 2018 Quoted * Unquoted Total Quoted * Unquoted Total (In millions) Equity Instruments Information Technology 7,166.5 — 7,166.5 12,181.6 — 12,181.6 Energy 3,047.5 — 3,047.5 5,167.9 — 5,167.9 Manufacturing 5,223.0 — 5,223.0 8,859.3 — 8,859.3 Financials 8,224.1 — 8,224.1 13,935.0 — 13,935.0 Others 22,724.1 — 22,724.1 38,482.7 — 38,482.7 46,385.2 — 46,385.2 78,626.5 — 78,626.5 Debt Instruments Government 227,093.5 — 227,093.5 351,696.7 — 351,696.7 Corporate Bonds (Investment Grade) 13,519.8 153,280.4 166,800.2 1,845.7 169,434.6 171,280.3 Corporate Bonds (Non Investment Grade) — 55,472.6 55,472.6 — 53,894.2 53,894.2 240,613.3 208,753.0 449,366.3 353,542.4 223,328.8 576,871.2 Property Funds UK — 22,112.6 22,112.6 — 15,227.0 15,227.0 Other — 20,763.6 20,763.6 — 14,765.5 14,765.5 — 42,876.2 42,876.2 — 29,992.5 29,992.5 Cash and Cash equivalents 19,047.9 — 19,047.9 20,109.4 — 20,109.4 Other Hedge Funds — 28,032.9 28,032.9 — 32,853.3 32,853.3 Private Markets 381.7 30,392.9 30,774.6 184.6 23,255.7 23,440.3 Alternatives 1,394.7 73,373.0 74,767.7 43,373.8 19,748.9 63,122.7 1,776.4 131,798.8 133,575.2 43,558.4 75,857.9 119,416.3 Derivatives Foreign exchange contracts — 1,478.2 1,478.2 — 92.3 92.3 Interest Rate and inflation — 29,672.0 29,672.0 — 21,041.0 21,041.0 — 31,150.2 31,150.2 — 21,133.3 21,133.3 Collateralized debt obligations — — — (118,770.3 ) (118,770.3 ) — — — — (118,770.3 ) (118,770.3 ) Total 307,822.8 414,578.2 722,401.0 495,836.7 231,542.2 727,378.9 * determined on the basis of quoted prices for identical assets or liabilities in active markets. The split of Level 1 assets is 62% (2018: 71%), Level 2 assets 24% (2018: 20%) and Level 3 assets 14% (2018: 9%). Private market holdings are classified as Level 3 instruments. Included in the value for Government securities, Interest Rate and Inflation derivatives are Repo transactions, as noted above. The sensitivity analysis below is based on a change in an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. When calculating the sensitivity of the defined benefit obligation to significant actuarial assumptions the same method (present value of the defined benefit obligation calculated with the projected unit credit method at the end of the reporting period) has been applied as when calculating the pension liability recognized within the consolidated balance sheet. Assumption Change in assumption Impact on defined benefit Impact on service cost and interest cost Discount rate Increase / decrease by 0.25% Decrease/increase by Decrease/increase by Inflation rate Increase / decrease by 0.25% Increase/decrease by Increase/decrease by Mortality rate Increase / decrease by 1 year Increase/decrease by Increase/decrease by Jaguar Land Rover contributes towards the UK defined benefit schemes. Following the April 5, 2015 valuations, it is intended to eliminate the pension scheme funding deficits over the 10 years following the valuation date. As at March 31, 2019, there is no additional liability; however, following the changes to the defined befenfit schemes’ rules in April 2017, an additional obligation may arise in the future. The current agreed contribution rate for defined benefit accrual is 31% of pensionable salaries in the UK. Deficit contribution levels remain in line with the schedule of contributions agreed follwoing the 2015 statutory valuation. Both the ongoing and deficit contribution rates these are expected to reduce following the completion of the 2019 statutory valuation during 2020. The average duration of the benefit obligation at March 31, 2019 is 19.00 years (2018: 20.04 years). With the new benefit structure effective April 6, 2017, the expected net periodic pension cost for the year ended March 31, 2020 is Rs.15,042.8 million. The Company expects to pay Rs. 20,187.3 million to its defined benefit schemes in the year ended March 31, 2020. During the year ended March 31, 2019, the High Court in United Kingdom ruled that pension schemes are required to equalize male and female members benefit for the inequalities within guaranteed minimum pension (GMP) earned between May 17, 1990 and April 5, 1997. Based on this, the Company reassessed its obligations under its existing Jaguar Land Rover pension plans and recorded an additional liability of an amount of GBP 16.5 million (Rs. 1,479.3 million) as past service costs during the year ended March 31, 2019. On April 3, 2017, Jaguar Land Rover Automotive Plc approved and communicated to its Defined Benefit schemes’ members that the defined benefit schemes’ rules were to be amended with effect from April 6, 2017 so that, amongst other changes, retirement benefits will be calculated on a career average basis rather than based upon a member’s final salary at retirement. These changes were effective from April 6, 2017 and as a result of the re-measurement Defined contribution plan The Company’s contribution to defined contribution plans aggregated Rs. 11,862.1 million, Rs.8,995.9 million and Rs.7,549.5 million for years ended March 31, 2019, 2018 and 2017, respectively.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Commitments and contingencies	Commitments and contingencies In the ordinary course of business, the Company faces claims and assertions by various parties. The Company assesses such claims and assertions and monitors the legal environment on an ongoing basis, with the assistance of external legal counsel, wherever necessary. The Company records a liability for any claims where a potential loss is probable and capable of being estimated and discloses such matters in its financial statements, if material. For potential losses that are considered possible, but not probable, the Company provides disclosure in the financial statements but does not record a liability in its accounts unless the loss becomes probable. The following is a description of claims and assertions where a potential loss is possible, but not probable. The Company believes that none of the contingencies described below would have a material adverse effect on the Company’s financial condition, results of operations or cash flows. Litigation The Company is involved in legal proceedings, both as plaintiff and as defendant. There are claims which the Company does not believe to be of material nature, other than those described below. Income Tax The Company has ongoing disputes with income tax authorities relating to tax treatment of certain items. These mainly include disallowed expenses, the tax treatment of certain expenses claimed by the Company as deductions and the computation of, or eligibility of, the Company’s use of certain tax incentives or allowances. Most of these disputes and/or disallowances, being repetitive in nature, have been raised by the income tax authorities consistently in most of the years. The Company has a right of appeal to the Commissioner of Income Tax (Appeals), or CIT (A), the Dispute Resolution Panel, or DRP, and to the Income Tax Appellate Tribunal, or ITAT, against adverse decisions by the assessing officer, DRP or CIT (A), as applicable. The income tax authorities have similar rights of appeal to the ITAT against adverse decisions by the CIT (A) or DRP. The Company has a further right of appeal to the Bombay High Court or the Supreme Court against adverse decisions by the appellate authorities for matters involving substantial question of law. The income tax authorities have similar rights of appeal. As at March 31, 2019, there are matters and/or disputes pending in appeal amounting to Rs 5,410 million, which includes Rs. 772 million in respect of equity accounted investees (Rs.3,031 million, which includes Rs.22 million in respect of equity accounted investees as at March 31, 2018). Customs, Excise Duty and Service Tax As at March 31, 2019, there are pending litigations for various matters relating to customs, excise duty and service taxes involving demands, including interest and penalties, of Rs. 10,240 million, which includes Rs. 61 million in respect of equity accounted investees (Rs.16,717 million, which includes Rs.50 million in respect of equity accounted investees, as at March 31, 2018). These demands challenged the basis of valuation of the Company’s products and denied the Company’s claims of Central Value Added Tax, or CENVAT, credit on inputs. The details of the demands for more than Rs.200 million are as follows: The Excise Authorities have raised a demand for Rs. 907 million as at March 31, 2019 (Rs.907 million as at March 31, 2018), on account of alleged undervaluation of ex-factory As at March 31, 2019, the Excise Authorities have raised a demand and penalty of Rs.2,432 million, (Rs.2,399 million as at March 31, 2018), due to the classification of certain chassis (as dumpers instead of goods transport vehicles) which were sent to automotive body builders by the Company, which the Excise Authorities claim requires the payment of the National Calamity Contingent Duty, or NCCD. The Company has obtained a technical expert certificate on the classification. The appeal is pending before the Custom Excise & Service Tax Appellate Tribunal. The Excise Authorities had denied the Company’s claim of a CENVAT credit of Rs. 190 million (Rs.360 million as at March 31, 2018) claimed by the Company from Fiscal 1992 to Fiscal 2013, on technical grounds. The matter is being contested by the Company before the appellate authorities. As at March 31, 2019, the Excise Authorities had levied penalties and interest amounting to Rs.903 million (Rs.6,799 million as at March 31, 2018) with respect to CENVAT credit claimed by the Company from March 2010 to June 2017, on inputs, stating that vehicles manufactured at Uttarakhand plant are “Exempted Products” and the Company may not claim a CENVAT credit on these vehicles. The Company has challenged this demand as NCCD and the automobile cess is assessed on those vehicles, which are “duties of excise”. Therefore, the Company asserts that these vehicles are not “Exempted Products”. The matter is being contested by the Company before the appellate authorities. As at March 31, 2019, the Excise Authorities have raised a demand amounting to Rs.295 million (Rs.295 million as at March 31, 2018) on pre-delivery pre-delivery As at March 31, 2019, the Exicse Authorities have confirmed demand & penalty totalling to Rs.909 million (Rs.909 million as at March 31, 2018) towards vehicles allegedly sold below cost of production with an intention to penetrate the market. The matter is being contested by the Company before the appellate authorities. The Excise Authorities had denied the Company’s claim of a CENVAT credit of Rs.875 million as at March 31, 2019 on various inputs services like Authorized Service Station Services, Erection, Commissioning & Installation Services, Common Services etc. claimed by the Company from financial year 2006 to 2017. The matters are being contested by the Company before the Appellate Authorities. As at March 31, 2019, the Excise Authorities have confirmed the demand and penalty totalling to Rs.912 million (Rs. NIL as at March 31, 2018) alleging undervaluation of products sold by the Company. The matter is being contested by the Company before Appellate Authorities. As at March 31, 2019, demand and penalty totalling to Rs.235 million(Rs. NIL as at March 31, 2018) has been confirmed for alleged non-payment Sales Tax / VAT The total sales tax demands (including interest and penalty), that are being contested by the Company amount to Rs.12,841 million, which includes Rs.125 million in respect of equity accounted investees as at March 31, 2019 (Rs.10,962 million, which includes Rs.109 million in respect of equity accounted investees, as at March 31, 2018). The details of the demands for more than Rs.200 million are as follows: The Sales Tax Authorities have raised demand of Rs.2,618 million (Rs.2,694 million as at March 31, 2018) towards rejection of certain statutory forms for concessional lower/nil tax rate (Form F and Form C) on technical grounds such as late submission, single form issued against different months’ / quarters’ dispatches / sales, etc. and denial of exemption from tax in absence of proof of export for certain year. The Company has contended that the benefit cannot be denied on technicalities, which are being complied with. The matter is pending at various levels. The Sales Tax authorities have denied input tax credit and levied interest and penalty thereon due to varied reasons aggregating to Rs.4,652 million as at March 31, 2019 (Rs.4,360 million as at March 31, 2018). The reasons for disallowing credit was mainly due to Taxes not paid by Vendors, incorrect method of calculation of set off as per the department, alleging suppression of sales as per the department etc. The matter is contested in appeal. As at March 31, 2019, Sales Tax demand aggregating Rs.467 million (Rs.958 million as at March 31, 2018) has been raised by Sales Tax Authorities for non submission of Maharashtra Trial Balance. The matter is contested in appeal. The Sales Tax Authorities have raised demand for Entry Tax liability at various states amouting to Rs.840 million (Rs.239 million as at March 31, 2018). The Company is contesting this issue. In case of one of the joint operation entity, Fiat India Automobiles Pvt Ltd, the Sales Tax Authorities have held back the refund of VAT on debit notes raised for Take or Pay arrangements (TOP) totaling to Rs.516 million. The department is of the view that TOP is not part of sale and hence tax to be paid. The matter is contested in appeal. The Sales Tax Authorities have appealed in case of export of chassis offers body building. The Sales Tax Authorities, contention is that the transaction was not an export and was an interstate sales and hence Sales Tax was applicable. The demand amount including interest aggregated to Rs.1,488 million. The matter is contested in appeal. Other Taxes and Dues Other amounts for which the Company may contingently be liable aggregate to Rs.4,516 million, which includes Rs.168 million in respect of equity accounted investees as at March 31, 2019 (Rs.3,670 million, which includes Rs.18 million in respect of equity accounted investees, as at March 31, 2018). Following are the cases where amount involved exceeds Rs.200 million: The municipal authorities in certain states levy octroi duty (a local indirect tax) on goods brought inside the municipal limits at rates based on the classification of goods. Demands aggregating Rs.617 million as at March 31, 2019 (Rs.617 million as at March 31, 2018) had been raised demanding higher octroi duties on account of classification disputes relating to components purchased for the manufacture of vehicles and retrospective increase in octroi rates relating to past periods. The dispute relating to classification is presently pending before the Bombay High Court and the other dispute is pending before the Supreme Court. As at March 31, 2019, property tax amounting to Rs.644 million (Rs.568 million as at March 31, 2018) has been demanded by the local municipal authorities in respect of vacant land of the Company in the plants in Pimpri, Chinchwad and Chikhali. The Company has filed Special Leave Petition (SLP) before the Supreme Court against an unfavorable decision of the Bombay High Court. The Supreme Court has disposed of the SLP and remanded the matter back to the local municipal corporation for fresh adjudication. As at March 31, 2019, Sales tax / VAT amounting to Rs.341 million (Rs.305 million as at March 31, 2018) has been demanded by local authorities on dealers in respect of spare parts used for carrying out warranty repairs. The dispute is pending before the Supreme Court of India. As at March 31, 2019, possession tax amounting to Rs.369 million have been demanded in respect of motor vehicles in the possession of the manufacturer and the authorization of trade certificate granted under the Central Motor Vehicle Rules, 1989. The matter is being contested before the Hon’ble Supreme Court of India. Other claims There are other claims against the Company, the majority of which pertain to government body investigations with regards to regulatory compliances, motor accident claims, product liability claims and consumer complaints. Some of the cases also relate to the replacement of parts of vehicles and/or the compensation for deficiencies in the services by the Company or its dealers. The Hon’ble Supreme Court of India (“SC”) by their order dated February 28, 2019, set out the principles based on which allowances paid to the employees should be identified for inclusion in basic wages for the purposes of computation of Provident Fund contribution. Subsequently, a review petition against this decision has been filed and is pending before the SC for disposal. Further, there are interpretative challenges and considerable uncertainty, including estimating the amount retrospectively. Pending the outcome of the review petition and directions from the EPFO, the impact for past periods, if any, is not ascertainable reliably and consequently no financial effect has been provided for in the financial statements. The Company has made a provision on a prospective basis, from the date of the SC order. The Company has, consequent to an Order of the Hon’ble Supreme Court of India in the case of R.C Gupta and Ors. Vs Regional Provident Fund Commissioner, Employees Provident Fund Organization and Ors, evaluated the impact on its employee pension scheme and concluded that this is not applicable to the Company based on external legal opinion and hence it is not probable that there there will be an outflow of resources. Post the sale of investments of TAL Manufacturing Solutions Ltd (TAL) to Tata Advances Systems Ltd (TASL), the Company has continued its performance guarantee amounting to Rs. 6,915 million (USD 100 million) in respect of TAL’s obligations to its customer to cover the events post the share sale, against a back-to-back Commitments The Company has entered into various contracts with vendors and contractors for the acquisition of plant and machinery, equipment and various civil contracts of a capital nature amounting to Rs.115,292 million, which includes Rs.284 million in respect of equity accounted investees as at March 31, 2019 (Rs.100,187 million, which includes Rs.127 million in respect of equity accounted investees, as at March 31, 2018), which are yet to be executed. The Company has entered into various contracts with vendors and contractors for the acquisition of intangible assets of a capital nature amounting to Rs.5,676 million as at March 31, 2019, (Rs.5,814 million as at March 31, 2018), which are yet to be executed. Under the joint venture agreement with Chery Jaguar Land Rover Automotive Co. Limited, the Company is committed to contribute Rs.36,064 million as at March 31, 2019 (Rs.36,221 million as at March 31, 2018) towards its share in the capital of the joint venture of which Rs.29,624 million (Rs.29,753 million as at March 31, 2018) has been contributed as at March 31, 2019. As at March 31, 2019, the Company has an outstanding commitment of Rs.6,440 million (Rs.6,468 million as at March 31, 2018).

Capital Management

Capital Management	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Capital Management	37. Capital Management The Company’s capital management is intended to create value for shareholders by facilitating the meeting of long-term and short-term goals of the Company. The Company determines the amount of capital required on the basis of annual operating plans and long-term product and other strategic investment plans. The funding requirements are met through equity, convertible and non-convertible The Company monitors the capital structure on the basis of total debt to equity ratio and maturity profile of the overall debt portfolio of the Company. Total debt includes all long and short-term debts as disclosed in notes 20 and 21 to the consolidated financial statements. Equity comprises all components excluding (profit)/loss on cash flow hedges and foreign currency translation reserve. The following table summarizes the capital of the Company: As at March 31, 2019 2019 2018 (In millions) Equity* US$ 8,575.3 Rs. 593,022.3 Rs. 907,631.5 Short-term borrowings and current portion of long-term debt 5,087.8 351,843.7 277,287.4 Long-term debt 10,238.8 708,067.0 611,419.4 Total debt 15,326.6 1,059,910.7 888,706.8 Total capital (Debt + Equity) US$ 23,901.9 Rs. 1,652,933.0 Rs. 1,796,338.3 * Details of equity : As at March 31, 2019 2019 2018 (In millions) Total equity as reported in balance sheet US$ 8,069.9 Rs. 558,067.4 Rs. 913,521.0 Currency translation reserve attributable to - Shareholders of Tata Motors Limited (410.5 ) (28,388.6 ) (49,388.8 ) - Non-controlling (2.9 ) (198.6 ) (197.8 ) Hedging reserve 877.2 60,668.2 39,224.0 Cost of hedge reserve 41.6 2,873.9 4,473.1 Equity as reported above US$ 8,575.3 Rs. 593,022.3 Rs. 907,631.5

Disclosures on financial instru

Disclosures on financial instruments	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Disclosures on financial instruments	Disclosures on financial instruments This section gives an overview of the significance of financial instruments for the Company and provides additional information on balance sheet items that contain financial instruments. The details of significant accounting policies, including the criteria for recognition, the basis of measurement and the basis on which income and expenses are recognized, in respect of each class of financial asset, financial liability and equity instrument are disclosed in note 2 to the consolidated financial statements. (a) Financial assets and liabilities The following table presents the carrying amounts and fair value of each category of financial assets and liabilities as at March 31, 2019. Financial assets Cash and financial cost Investments - Investments - Investments - cost Derivatives Derivatives Total carrying value Total fair value Total value Total fair value (In millions) Cash and cash equivalents Rs. 215,598.0 Rs. — Rs. — Rs. — Rs. — Rs. — Rs. 215,598.0 Rs. 215,598.0 US$ 3,117.6 US$ 3,117.6 Short-term deposits 105,742.1 — — — — — 105,742.1 105,742.1 1,529.1 1,529.1 Finance receivables 336,246.9 — — — — — 336,246.9 334,290.5 4,862.2 4,833.9 Trade receivables 189,961.7 — — — — — 189,961.7 189,961.7 2,746.9 2,746.9 Other investments - non-current — 7,412.9 7,523.4 38.8 — — 14,975.1 14,975.1 216.8 216.8 Other investments - current — 9.2 11,919.0 77,455.1 — — 89,383.3 89,383.3 1,292.5 1,292.5 Other financial assets: - current 37,615.3 — — — 2,840.2 9,515.2 49,970.7 49,970.7 722.6 722.6 - non-current 23,054.6 — — — 5,219.4 3,892.0 32,166.0 32,166.0 465.1 465.1 Total Rs. 908,218.6 Rs. 7,422.1 Rs. 19,442.4 Rs. 77,493.9 Rs. 8,059.6 Rs. 13,407.2 Rs. 1,034,043.8 Rs. 1,032,087.4 US$ 14,952.8 US$ 14,924.5 Financial liabilities Derivatives Derivatives Other Total carrying Total fair Total carrying Total fair (In millions) Accounts payable Rs. — Rs. — Rs. 759,681.7 Rs. 759,681.7 Rs. 759,681.7 US$ 10,985.2 US$ 10,985.2 Acceptances — — 31,771.2 31,771.2 31,771.2 459.5 459.5 Short-term debt (excluding current portion of long-term debt) — — 201,502.6 201,502.6 201,502.6 2,913.8 2,913.8 Long-term debt (including current portion of long-term debt) (refer note below) — — 858,408.1 858,408.1 827,757.5 12,412.7 11,969.6 Other financial liabilities: - current 8,853.9 38,571.4 56,243.9 103,669.2 103,669.2 1,499.1 1,499.1 - non-current 1,959.0 24,665.4 2,864.4 29,488.8 29,488.8 426.4 426.4 Total Rs. 10,812.9 Rs. 63,236.8 Rs. 1,910,471.9 Rs. 1,984,521.6 Rs. 1,953,871.0 US$ 28,696.7 US$ 28,253.6 1 Includes USD denominated bonds designated as cash flow hedges against forecasted USD revenue amounting to Rs. 69,148.8 million (USD 1,000 million) 2 Inculdes Rs. 34,585.5 million designated as hedged item in fair value hedge relationship. This includes a loss of Rs. 445.6 million on account of fair value changes attributable to the hedged interest rate risk. The following table presents the carrying amounts and fair value of each category of financial assets and liabilities as at March 31, 2018. Financial assets Cash, and loans and receivables Available- for-sale financial assets Derivatives other than in relationship Derivatives in hedging Total carrying value Total fair value (In millions) Cash and cash equivalents Rs. 147,167.5 Rs. — Rs. — Rs. — Rs. 147,167.5 Rs. 147,167.5 Short-term deposits 193,615.7 — — — 193,615.7 193,615.7 Finance receivables 238,989.7 — — — 238,989.7 238,235.9 Trade receivables 198,933.0 — — — 198,933.0 198,933.0 Unquoted equity investments* — 2,036.9 — — 2,036.9 — Unquoted equity investments at fair value — 4,076.1 — — 4,076.1 4,076.1 Other investments 1,094.0 147,007.0 — — 148,101.0 148,101.0 Other financial assets: - current 33,682.3 — 13,931.8 10,829.5 58,443.6 58,443.6 - non-current 22,123.8 — 11,880.7 16,588.3 50,592.8 50,592.8 Total Rs. 835,606.0 Rs. 153,120.0 Rs. 25,812.5 Rs. 27,417.8 Rs. 1,041,956.3 Rs. 1,039,165.6 * The fair value in respect of the unquoted equity investments cannot be reliably measured. Financial liabilities Derivatives Derivatives in Other financial liabilities Total carrying Total fair value (In millions) Accounts payable Rs. — Rs. — Rs. 804,601.6 Rs. 804,601.6 Rs. 804,601.6 Acceptances — — 49,013.4 49,013.4 49,013.4 Short-term debt (excluding current portion of long-term debt) — — 167,948.5 167,948.5 167,948.5 Long-term debt (including current portion of long-term debt) (refer note below) — — 720,758.3 720,758.3 727,920.3 Other financial liabilities: - current 8,090.1 53,986.5 57,042.0 119,118.6 119,118.6 - non-current 1,395.1 23,106.9 3,385.4 27,887.4 27,887.4 Total Rs. 9,485.2 Rs. 77,093.4 Rs. 1,802,749.2 Rs. 1,889,327.8 Rs. 1,896,489.8 * Includes USD denominated bonds designated as cash flow hedges against forecasted USD revenue amounting to Rs.111,664.4 million (USD 1,700 million) The following table provides an analysis of financial instruments that are measured subsequent to initial recognition at fair value, grouped into Level 1 to Level 3, as described below. Quoted prices in an active market (Level 1): This level of hierarchy includes financial assets that are measured by reference to quoted prices (unadjusted) in active markets for identical assets or liabilities. This category consists quoted equity shares, quoted corporate debt instruments and mutual fund investments. Valuation techniques with observable inputs (Level 2): This level of hierarchy includes financial assets and liabilities, measured using inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (i.e., as prices) or indirectly (i.e., derived from prices). This level of hierarchy includes Company’s over-the-counter Valuation techniques with significant unobservable inputs (Level 3): This level of hierarchy includes financial assets and liabilities measured using inputs that are not based on observable market data (unobservable inputs). Fair values are determined in whole or in part, using a valuation model based on assumptions that are neither supported by prices from observable current market transactions in the same instrument nor based on available market data. The main items in this category are unquoted equity shares, measured at fair value through other comprehensive income. As at March 31, 2019 Level 1 Level 2 Level 3 Total (In millions) Financial assets measured at fair value Investments Rs. 19,481.9 Rs. — Rs. 7,382.6 Rs. 26,864.5 Derivative assets — 21,466.8 — 21,466.8 Total Rs. 19,481.9 Rs. 21,466.8 Rs. 7,382.6 Rs. 48,331.3 US$ 281.7 US$ 310.5 US$ 106.8 US$ 698.9 Financial liabilities measured at fair value Derivative liabilities Rs. — Rs. 74,049.7 Rs. — Rs. 74,049.7 Total Rs. — Rs. 74,049.7 Rs. — Rs. 74,049.7 US$ — US$ 1,070.7 US$ — US$ 1,070.7 As at March 31, 2018 Level 1 Level 2 Level 3 Total (In millions) Financial assets measured at fair value Available-for-sale Rs. 147,007.0 Rs. — Rs. — Rs. 147,007.0 Unquoted equity investments — — 4,076.1 4,076.1 Derivative assets — 53,230.3 — 53,230.3 Total Rs. 147,007.0 Rs. 53,230.3 Rs. 4,076.1 Rs. 204,313.4 Financial liabilities measured at fair value Derivative liabilities Rs. — Rs. 86,578.6 Rs. — Rs. 86,578.6 Total Rs. — Rs. 86,578.6 Rs. — Rs. 86,578.6 There have been no transfers between level 1 and level 2 for the period ended March 31, 2019 and 2018. The following table provides an analysis of fair value of financial instruments that are not measured at fair value on recurring basis, grouped into Level 1 to Level 3 categories: As at March 31, 2019 Level 1 Level 2 Level 3 Total (In millions) Financial assets not measured at fair value Finance receivables — — 334,290.5 334,290.5 Other investments 77,455.1 — 38.8 77,493.9 Total Rs. 77,455.1 Rs. — Rs. 334,329.3 Rs. 411,784.4 US$ 1,120.0 US$ — US$ 4,834.5 US$ 5,954.5 Financial liabilities not measured at fair value Short-term debt (excluding current portion of long-term debt) — 201,502.6 — 201,502.6 Long-term debt (including current portion of long-term debt) 352,851.5 474,906.0 — 827,757.5 Total Rs. 352,851.5 Rs. 676,408.6 Rs. — Rs. 1,029,260.1 US$ 5,102.3 US$ 9,781.2 US$ — US$ 14,883.5 As at March 31, 2018 Level 1 Level 2 Level 3 Total (In millions) Financial assets not measured at fair value Finance receivables — — 238,235.9 238,235.9 Other investments — 1,094.0 — 1,094.0 Total Rs. — Rs. 1,094.0 Rs. 238,235.9 Rs. 239,329.9 Financial liabilities not measured at fair value Short-term debt (excluding current portion of long-term — 167,948.5 — 167,948.5 Long-term debt (including current portion of long-term 399,497.0 328,423.3 — 727,920.3 Total Rs. 399,497.0 Rs. 496,371.8 Rs. — Rs. 895,868.8 Notes The short-term financial assets and liabilities are stated at amortized cost which is approximately equal to their fair value. Derivatives are fair valued using market observable rates and published prices together with forecast cash flow information where applicable. The fair value of finance receivables has been estimated by discounting expected cash flows using rates at which loans of similar credit quality and maturity would be made and internal assumptions such as expected credit losses and estimated collateral value for repossessed vehicles as at March 31, 2019 and 2018. Since unobservable inputs are applied, finance receivables are classified in Level 3. Equity are carried at their fair values, which are generally based on market price quotations. The fair value in respect of the unquoted equity investments are classified as Level 3 since unobservable inputs are applied. The fair value of borrowings which have a quoted market price in an active market is based on its market price and for other borrowings the fair value is estimated by discounting expected future cash flows, using a discount rate equivalent to the risk-free rate of return, adjusted for the credit spread considered by the lenders for instruments of similar maturity. Costs of certain unquoted equity instruments has been considered as an appropriate estimate of fair value because of a wide range of possible fair value measurements and cost represents the best estimate of fair value within that range. These investments in equity instruments are not held for trading. Instead, they are held for medium or long-term strategic purpose. Upon the application of IFRS 9, the Company has chosen to designate these investments in equity instruments as at FVTOCI as the management believe that this provides a more meaningful presentation for medium or long-term strategic investments, than reflecting changes in fair value immediately in profit or loss. Management uses its best judgment in estimating the fair value of its financial instruments. However, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented above are not necessarily indicative of all the amounts that the Company could have realized or paid in sale transactions as of respective dates. As such, the fair value of the financial instruments subsequent to the respective reporting dates may be different from the amounts reported at each year end. Offsetting Certain financial assets and financial liabilities are subject to offsetting where there is currently a legally enforceable right to set off recognized amounts and the Company intends to either settle on a net basis, or to realize the asset and settle the liability, simultaneously. Certain derivative financial assets and financial liabilities are subject to master netting arrangements, whereby in the case of insolvency, derivative financial assets and financial liabilities will be settled on a net basis. The following table discloses the amounts that have been offset, in arriving at the balance sheet presentation and the amounts that are available for offset only under certain conditions as at March 31, 2019: Gross Gross Net amount balance sheet Amounts subject to an Net amount Financial assets Financial Cash (In millions) Derivative financial instruments Rs. 21,466.8 Rs. — Rs. 21,466.8 Rs. (17,173.7 ) Rs. — Rs. 4,293.1 Trade receivables 191,052.4 (1,090.7 ) 189,961.7 — — 189,961.7 Cash and cash equivalents 254,334.7 (38,736.7 ) 215,598.0 — — 215,598.0 Total Rs. 466,853.9 Rs. (39,827.4 ) Rs. 427,026.5 Rs. (17,173.7 ) Rs. — Rs. 409,852.8 US$ 6,750.9 US$ (575.9 ) US$ 6,175.0 US$ (248.3 ) US$ — US$ 5,926.7 Financial liabilities Derivative financial instruments Rs. 74,049.7 Rs. — Rs. 74,049.7 Rs. (17,173.7 ) Rs. — Rs. 56,876.0 Accounts payable 760,772.4 (1,090.7 ) 759,681.7 — — 759,681.7 Loans from banks/financial institutions (short-term) 129,983.7 (38,736.7 ) 91,247.0 — — 91,247.0 Total Rs. 964,805.8 Rs. (39,827.4 ) Rs. 924,978.4 Rs. (17,173.7 ) Rs. — Rs. 907,804.7 US$ 13,951.3 US$ (575.9 ) US$ 13,375.4 US$ (248.3 ) US$ — US$ 13,127.1 The following table discloses the amounts that have been offset in arriving at the balance sheet presentation and the amounts that are available for offset only under certain conditions as at March 31, 2018: Gross Gross Net amount in the balance sheet Amounts subject to an Net amount Financial assets Financial Cash (In millions) Derivative financial instruments Rs. 53,230.3 Rs. — Rs. 53,230.3 Rs. (49,058.2 ) Rs. — Rs. 4,172.1 Trade receivables 199,905.7 (972.7 ) 198,933.0 — — 198,933.0 Cash and cash equivalents 163,843.3 (16,675.8 ) 147,167.5 — — 147,167.5 Total Rs. 416,979.3 Rs. (17,648.5 ) Rs. 399,330.8 Rs. (49,058.2 ) Rs. — Rs. 350,272.6 Financial liabilities Derivative financial instruments Rs. 86,578.6 Rs. — Rs. 86,578.6 Rs. (49,058.2 ) Rs. — Rs. 37,520.4 Accounts payable 805,574.3 (972.7 ) 804,601.6 — — 804,601.6 Loans from banks/financial institutions (short-term) 77,948.8 (16,675.8 ) 61,273.0 — — 61,273.0 Total Rs. 970,101.7 Rs. (17,648.5 ) Rs. 952,453.2 Rs. (49,058.2 ) Rs. — Rs. 903,395.0 (b) Transfer of financial assets The Company transfers finance receivables in securitization transactions and direct assignments. In such transactions the Company surrenders control over the receivables, though it continues to act as an agent for the collection of receivables. In most of these transactions, the Company also provides credit enhancements to the transferee. Because of the existence of credit enhancements in such transactions, the Company continues to have the obligation to pay to the transferee, limited to the extent of credit enhancement, even if it does not collect the equivalent amounts from the original asset and continues to retain substantially all risks and rewards associated with the receivables, and hence, such transfer or assignment does not meet the derecognition criteria resulting into the transfer not being recorded as sale. Consequently, the proceeds received from the transfer are recorded as collateralized debt obligation. Further the Company transfers certain trade receivables under the debt factoring arrangements. These do not qualify for derecognition, due to the recourse arrangement in place. Consequently the proceeds received from transfer are recorded as loans from banks / financial institutions and classified under short-term borrowings. The carrying amount of trade receivables and finance receivables along with the associated liabilities is as follows: As at March 31, 2019 2019 2018 Nature of Asset Carrying Carrying Carrying Carrying Carrying Carrying (In millions) Trade receivables US$ 149.2 US$ 149.2 Rs. 10,314.6 Rs. 10,314.6 Rs. 15,074.4 Rs. 15,074.4 Finance receivables US$ 438.7 US$ 440.7 Rs. 30,338.3 * Rs. 30,473.3 Rs. 13,069.1 * Rs. 13,205.8 * Net of provision of Rs. 380.3 million and Rs. 226.2 million as at March 31, 2019 and 2018, respectively. (c) Cash flow hedges The Group has a number of financial instruments in a hedging relationship. The Group uses both foreign currency forward and option contracts, cross currency interest rate swaps and other currency options to hedge changes in future cash flows as a result of foreign currency and interest rate risk arrising from sales and purchases and repayment of foreign currency bonds. The Group has also designated some of its U.S. dollar denominated bonds as hedging instruments in a cash flow hedging relationship to hedge the changes in future cash flows as a result of foreign currency risk arrising from future anticipated sales. The Group also has a number of foreign currency options and other currency options, which are entered into as an economic hedge of the financial risks of the Company. These contracts do not meet the hedge accounting criteria of IFRS 9, hence the change in fair value of these derivatives are recognized in the income statement. Options are designated on spot discounted basis. The time value of options are identified as cost of hedge. Changes in the time value of options are recognized in cost of hedge reserve. Changes in the spot intrinsic value of options is recognized in hedge reserve. Changes in fair value arising from own and counterparty credit risk in options and forward exchange contracts are considered ineffective in the hedge relationship and thus the change in fair value of forward exchange contracts attributable to changes in credit spread are recognized in the income statement. Cross currency basis spread was historically included in the hedging relationship. Cross currency basis spread arising from forward exchange contracts is identified as cost of hedge and accordingly changes in fair value attributable to this is recognized in cost of hedge reserve. Changes in fair value of foreign currency derivative and bonds, to the extent determined to be an effective hedge, is recognized in other comprehensive income and the ineffective portion of the fair value change is recognized in the income statement. The fair value gain/losses recorded in hedge reserve and cost of hedge reserve is recognized in the income statement when the forecasted transactions occur. The accumulated gain/losses in hedge reserve and cost of hedge reserve are expected to be recognized in the income statement during the years ending March 31, 2020 to 2024. Year ended March 31, 2019 2019 2018 2017 Fair value gain/(loss) of foreign currency derivative contracts recognized in hedging reserve and cost of hedge reserve US$ (1,171.2 ) Rs. (80,992.4 ) Rs. 94,016.9 Rs. (249,818.5 ) Fair value gain/(loss) of foreign currency bonds recognized in hedging reserve (136.3 ) (9,429.1 ) 12,435.2 (13,140.7 ) Fair value gain/(loss) of cross currency interest rate swaps entered for cash flow hedges of repayment of foreign currency denominated borrowings recognized in hedging reserve 6.4 446.0 (359.0 ) — Fair value gain/(loss) of interest rate swaps entered for cash flow hedges of payment of interest on borrowings that are benchmarked to libor (8.6 ) (595.7 ) — — Gain/(loss) recognized in hedging reserve and cost of hedge reserve US$ (1,309.7 ) (90,571.2 ) 106,093.1 (262,959.2 ) Gain/(loss) reclassified from Hedging reserve and recognized in ‘Revenue’ in the income statement on occurance of forecast sales US$ (1,150.0 ) Rs. (79,529.5 ) Rs. (118,767.0 ) Rs. (112,697.8 ) Gain/(loss) reclassified out of Hedging reserve and recorded in ‘Raw materials, components and consumables’ in the income statement when forecast purchases affect income statement — — 15,674.8 7,553.4 Gain/(loss) reclassified from Hedging reserve and recognized in ‘Foreign exchange (gain)/loss (net)’ in the income statement on account of forecast transactions no longer expected to occur (14.9 ) (1,033.4 ) 555.5 (3,673.1 ) Gain/(loss) reclassified from other components of equity to income statement US$ (1,164.9 ) Rs. (80,562.9 ) Rs. (102,536.7 ) Rs. (108,817.5 ) (d) Financial risk management In the course of its business, the Company is exposed primarily to fluctuations in foreign currency exchange rates, interest rates, equity prices, liquidity and credit risk, which may adversely impact the fair value of its financial instruments. The Company has a risk management policy which not only covers the foreign exchange risks but also other risks associated with the financial assets and liabilities such as interest rate risks and credit risks. The risk management policy is approved by the board of directors. The risk management framework aims to: • Create a stable business planning environment by reducing the impact of currency and interest rate fluctuations on the Company’s business plan. • Achieve greater predictability to earnings by determining the financial value of the expected earnings in advance. (i) Market risk Market risk is the risk of any loss in future earnings, in realizable fair values or in future cash flows that may result from a change in the price of a financial instrument. The value of a financial instrument may change as a result of changes in the interest rates, foreign currency exchange rates, equity price fluctuations, liquidity and other market changes. Future specific market movements cannot be normally predicted with reasonable accuracy. (i) – (a) Foreign currency exchange rate risk: The fluctuation in foreign currency exchange rates may have potential impact on the income statement and equity, where any transaction references more than one currency or where assets/liabilities are denominated in a currency other than the functional currency of the respective consolidated entities. Considering the countries and economic environment in which the Company operates, its operations are subject to risks arising from fluctuations in exchange rates in those countries. The risks primarily relate to fluctuations in U.S. dollar, GBP, Chinese renminbi, Japanese yen, Singapore dollar and Euro, against the respective functional currencies of Tata Motors Limited and its subsidiaries. The Company, as per its risk management policy, uses foreign exchange and other derivative instruments primarily to hedge foreign exchange and interest rate exposure. Furthermore, any movement in the functional currencies of the various operations of the Company against major foreign currencies may impact the Company’s revenues from its international operations. Any weakening of the functional currency may impact the Company’s cost of imports and cost of borrowings and consequently may increase the cost of financing the Company’s capital expenditures. The Company evaluates the impact of foreign exchange rate fluctuations by assessing its exposure to exchange rate risks. It hedges a part of these risks by using derivative financial instruments in accordance with its risk management policies. The foreign exchange rate sensitivity is calculated for each currency by aggregation of the net foreign exchange rate exposure of a currency and a simultaneous parallel foreign exchange rates shift in the foreign exchange rates of each currency by 10%. The following analysis is based on the gross exposure as of the relevant balance sheet dates, which could affect the income statement. There is no exposure to the income statement on account of translation of financial statements of consolidated foreign entities. Furthermore, the exposure as indicated below is mitigated by some of the derivative contracts entered into by the Company as disclosed at clause (iv) below. The following table sets forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2019: U.S. dollar Euro Chinese GBP Japanese Others* Total (In millions) Financial assets Rs. 227,659.7 Rs. 125,940.9 Rs. 19,853.1 Rs. 16,006.7 Rs. 3,398.6 Rs. 27,184.6 420,043.6 Financial liabilities Rs. 390,892.0 Rs. 322,260.4 Rs. 38,501.1 Rs. 59,269.8 Rs. 4,405.9 Rs. 28,285.3 843,614.5 * Others mainly include currencies such as the Russian rouble, Singapore dollars, Swiss franc, Australian dollars, South African rand, Thai baht and Korean won. 10% appreciation/depreciation of the respective foreign currencies with respect to functional currency of the Company would result in decrease/increase in the Company’s net income before tax by approximately Rs. 42,004.4 million and Rs. 77,446.6 million for financial assets and financial liabilities, respectively for the year ended March 31, 2019 and decrease/increase in the Company’s other comprehensive income by approximately Rs.6,914.9 million in respect of financial liabilities designated in cash flow hedges for the year ended March 31, 2019. The following table set forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2018: U.S. dollar Euro Chinese GBP Japanese Others* Total (In millions) Financial assets Rs. 135,310.7 Rs. 128,171.7 Rs. 49,977.2 Rs. 15,115.0 Rs. 4,750.2 Rs. 41,652.4 374,977.2 Financial liabilities Rs. 369,091.0 Rs. 311,926.9 Rs. 53,989.1 Rs. 63,716.6 Rs. 5,456.5 Rs. 35,389.5 839,569.6 * Others mainly include currencies such as the Russian rouble, Singapore dollars, Swiss franc, Australian dollars, South African rand, Singapore dollars, Thai baht and Korean won. 10% appreciation/depreciation of the respective foreign currencies with respect to functional currency of the Company would result in decrease/increase in the Company’s net income before tax by approximately Rs. 37,497.7 million and Rs. 72,790.6 million for financial assets and financial liabilities, respectively for the year ended March 31, 2018 and decrease/increase in the Company’s other comprehensive income by approximately Rs. 11,166.4 million in respect of financial liabilities designated in cash flow hedges for the year ended March 31, 2018. The following table set forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2017: U.S. dollar Euro Chinese Japanese Others* Total (In millions) Financial assets Rs. 104,987.4 Rs. 98,624.2 Rs. 40,009.6 Rs. 1,279.8 Rs. 44,323.2 Rs. 289,224.2 Financial liabilities Rs. 375,478.7 Rs. 213,018.3 Rs. 33,991.9 Rs. 5,382.2 Rs. 29,392.5 Rs. 657,263.6 * Others mainly include currencies such as the Russian rouble, Swiss franc, Australian dollars, South African rand, Singapore Dollars, Thai baht and Korean won. 10% appreciation/depreciation of the respective foreign currencies with respect to functional currency of the Company would result in decrease/increase in the Company’s net income before tax by approximately Rs. 28,922.4 million and Rs. 58,201.0 million for financial assets and financial liabilities, respectively for the year ended March 31, 2017 and decrease/increase in the Company’s other comprehensive income before tax by approsimately 7,525.4 million in respect of financial liabilities designated in cash flow hedges for the year ended March 31, 2017. (Note: The impact is indicated on the income/loss before tax basis). (i) – (b) Interest rate risk Interest rate risk is measured by using the cash flow sensitivity for changes in variable interest rates. Any movement in the reference rates could have an impact on the Company’s cash flows as well as costs. The Company is subject to variable interest rates on some of its interest bearing liabilities. The Company’s interest rate exposure is mainly related to debt obligations. The Company also uses a mix of interest rate sensitive financial instruments to manage the liquidity and fund requirements for its day to day operations like short term non-convertible In its financing business, the Company enters into transactions with customers which primarily result in receivables at fixed rates. In order to manage this risk, the Company has a policy to match funding in terms of maturities and interest rates and also for certain part of the portfolio, the Company does not match funding with maturities, in order to take advantage of market opportunities. The Company also enters into arrangements of securitization of receivables in order to reduce the impact of interest rate movements. Further, the Company also enters in to interest rate swap contracts with banks to manage its interest rate risk. As at March 31, 2019, 2018 and 2017, financial liability of Rs. 302,786.3 million, Rs. 210,182.8 million and Rs. 189,283.6 million, respectively, was subject to variable interest rates. Increase/decrease of 100 basis points in interest rates at the balance sheet date would result in an impact (decrease/increase in case of net income) of Rs. 3,027.9 million, Rs. 2,101.8 million and Rs. 1,892.8 million on income for the years ended March 31, 2019, 2018 and 2017, respectively. The model assumes that interest rate changes are instantaneous parallel shifts in the yield curve. Although some assets and liabilities may have similar maturities or periods to re-pricing, The risk estimates provided assume a parallel shift of 100 basis points interest rate across all yield curves. This calculation also assumes that the change occurs at the balance sheet date and has been calculated based on risk exposures outstanding as at that date. The period end balances are not necessarily representative of the average debt outstanding during the period. This analysis assumes that all other variables, in particular foreign currency rates, remain constant. (Note: The impact is indicated on the income/loss before tax basis). The Company uses cross currency interest rate swaps to hedge some of its exposure to interest rate arising from variable rate foreign currency denominated debt. The Company uses cross currency interest rate swaps to hedge some of its exposure to interest rate arising from variable rate foreign currency denominated debt. The Company and its subsidiaries also uses cross currency interest rate swaps to convert some of its foreign currency denominated fixed rate debt to floating rate debt. (i) – (c) Equity Price risk Equity Price Risk is related to the change in market reference price of the investments in equity securities. The fair value of some of the Company’s investments in equity securities exposes the Company to equity price risks. In general, these securities are not held for trading purposes. These investments are subject to changes in the market price of securities. The fair value of quoted equity securities measured at FVTOCI/available-for-sale available-for-sale The fair value of some of the Company’s investments in quoted equity securities measured at FVTPL as of March 31, 2019 and 2018, was Rs. 4,231.4 million and Rs. Nil , respectively. A 10% change in prices of these securities measured at FVTPL held as of March 31, 2019 and 2018, would result in an impact of Rs. 423.1 million and Rs. Nil on income statement, respectively. (Note: The impact is indicated on equity before consequential tax impact, if any). (ii) Credit risk Credit risk is the risk of financial loss arising from counterparty failure to repay or service debt according to the contractual terms or obligations. Credit risk encompasses both the direct risk of default and the risk of deterioration of creditworthiness as well as concentration risks. Financial instruments that are subject to concentrations of credit risk, principally consist of investments in debt instruments, trade receivables, finance receivables, loans and advances and derivative financial instruments. None of the financial instruments of the Company result in material concentrations of credit risks. Exposure to credit risk The carrying amount of financial assets represents the maximum credit exposure. The maximum exposure to credit risk was Rs. 1,028,129.9 million as at March 31, 2019 and Rs. 1,035,065.2 million as at March 31, 2018, being the total of the carrying amount of balances with banks, short term deposits with banks, trade receivables, finance receivables, margin money and other financial assets excluding equity investments. Financial assets that are neither past due nor impaired None of the Company’s cash equivalents, including time deposits with banks, are past due or impaired. Regarding trade receivables and other receivables, and other loans or receivables that are neither impaired nor past due, there were no indications as at March 31, 2019, that defaults in payment obligations will occur. Credit quality of financial assets and impairment loss The aging of trade receivables and finance receivables as of balance sheet date is given below. The age analysis have been considered from the due date. As at March 31, 2019 2019 2019 2019 2019 2019 2018 2018 2018 Trade receivables Gross Allowance Net Gross Allowance Net Gross Allowance Net (In millions) Period (in months) Not due US$ 2,182.0 US$ (4.7 ) US$ 2,177.4 Rs.150,898.8 Rs. (324.1 ) Rs.150,574.7 Rs.159,519.0 Rs. (215.7 ) Rs.159,303.3 Overdue up to 3 months 449.5 (1.9 ) 447.6 31,086.5 (131.0 ) 30,955.5 32,819.4 (371.5 ) 32,447.9 Overdue 3-6 36.4 (2.7 ) 33.8 2,516.9 (1

Segment reporting

Segment reporting	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Segment reporting	39. Segment reporting The Company primarily operates in the automotive segment. The automotive segment includes all activities relating to development, design, manufacture, assembly and sale of vehicles including financing thereof, as well as sale of related parts and accessories. The Company provides financing for vehicles sold by dealers in India. The vehicle financing is intended to drive sale of vehicles by providing financing to the dealers’ customers and as such is an integral part of automotive business. The financing activity is assessed as an integral part of the overall automotive business. A core recent initiative of the Company was the implementation of the Organization Effectiveness (OE) program, a strategic program designed to overhaul and transform the Company. Pursuant to the changes implemented as a result of the OE program, the Company has drawn separate strategies for commercial vehicles, passenger vehicles and financing business from Fiscal 2019. Consequent to these changes, the automotive segments will have the following four reportable segments commencing from Fiscal 2019: a) Automotive: The Automotive segment consist of four reportable segments: Tata Commercial Vehicles, Tata Passenger Vehicles, Jaguar Land Rover and Vehicle Financing. The segment results for Vehicle Financing have been adjusted for finance costs arising from the borrowings sourced by this segment. b) Others: Others primarily consist of IT services. This segment information is provided to and reviewed by the Company’s Chief Operating Decision Maker (CODM). The reportable segment information for the corresponding previous periods reported has been updated to make it comparable. The segment information presented is in accordance with the accounting policies adopted for preparing the consolidated financial statements of the company. Segment revenues, expenses and results include inter-segment transfers. Such transfers are undertaken either at competitive market prices charged to unaffiliated customers for similar goods or at contracted rates. These transfers are eliminated on consolidation. For the year ended March 31, 2019 Automotive and related activity Tata and other brand vehicles * Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable** Total (In millions) Revenues: External revenue Rs. 579,496.9 Rs. 141,622.2 Rs. — Rs. 721,119.1 Rs. 33,995.5 Rs. 2,216,656.9 Rs. — Rs. 2,971,771.5 Rs. 21,890.9 Rs. — Rs. 2,993,662.4 US$ 43,289.2 Inter-segment/intra-segment revenue Rs. — Rs. 26.8 Rs. — Rs. 26.8 Rs. 1,129.5 Rs. — Rs. (1,156.3 ) Rs. — Rs. 13,432.8 Rs. (13,432.8 ) Rs. — US$ — Total revenues Rs. 579,496.9 Rs. 141,649.0 Rs. — Rs. 721,145.9 Rs. 35,125.0 Rs. 2,216,656.9 Rs. (1,156.3 ) Rs. 2,971,771.5 Rs. 35,323.7 Rs. (13,432.8 ) Rs. 2,993,662.4 US$ 43,289.2 Earnings Before Other Income, Interest and Tax (a) Rs. 34,007.1 Rs. (15,842.3 ) Rs. (4,761.8 ) 13,403.0 21,153.3 (323,812.6 ) — (289,256.3 ) 4,103.6 (1,201.8 ) (286,354.5 ) (4,140.8 ) Finance costs pertaining to borrowings sourced by vehicle financing segment (26,156.5 ) (26,156.5 ) (26,156.5 ) (378.2 ) Segment results 34,007.1 (15,842.3 ) (4,761.8 ) 13,403.0 (5,003.2 ) (323,812.6 ) — (315,412.8 ) 4,103.6 (1,201.8 ) (312,511.0 ) (4,519.0 ) Share of profit/(loss) of equity accounted investees (net) — — 416.7 416.7 (7.2 ) 753.7 — 1,163.2 931.8 — 2,095.0 30.3 Reconciliation to net income/(loss): Assets written off/loss on sale of assets and others (net) (13,186.7 ) (190.7 ) Other income/(loss) (net) 35,438.7 512.5 Foreign exchange gain/(loss) (net) (5,824.2 ) (84.2 ) Interest income 7,864.6 113.7 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (31,429.5 ) (454.4 ) Income tax (expense)/credit 25,425.0 367.7 Net Income/(loss) Rs. (292,128.1 ) US$ (4,224.1 ) Depreciation and amortization Rs. 16,164.1 13,626.0 1,524.3 31,314.4 186.5 Rs. 197,437.4 Rs. — Rs. 228,938.3 Rs. 1,617.1 Rs. (357.6 ) Rs. 230,197.8 US$ 3,328.7 Capital expenditure Rs. 20,100.8 29,331.7 763.5 50,196.0 719.6 Rs. 290,656.3 — 341,571.9 664.5 — 342,236.4 4,948.8 906.1 Segment assets Rs. 237,225.5 Rs. 176,558.2 Rs. 15,037.0 Rs. 428,820.7 Rs. 382,615.8 Rs. 1,670,913.0 Rs. — Rs. 2,482,349.5 Rs. 20,037.4 Rs. (12,252.5 ) Rs. 2,490,134.4 US$ 36,008.0 Assets classified as held for sale 1,622.4 — — 1,622.4 — — 1,622.4 — — 1,622.4 23.5 Investment in equity accounted investees — — 4,225.5 4,225.5 26.6 43,181.7 — 47,433.8 5,915.0 — 53,348.8 771.4 Reconciliation to total assets: Investments 104,358.4 1,509.1 Current and non-current 12,089.3 174.9 Deferred income taxes 51,511.1 744.9 Other unallocated financial assets 1 274,055.5 3,963.0 Total assets Rs. 2,987,119.9 US$ 43,194.8 Segment liabilities Rs. 157,447.7 Rs. 36,347.5 Rs. 17,521.3 Rs. 211,316.5 Rs. 7,114.3 Rs. 1,039,660.5 Rs. (3,376.5 ) Rs. 1,254,714.8 Rs. 5,290.7 Rs. (2,520.6 ) Rs. 1,257,484.9 US$ 18,183.6 Reconciliation to total liabilities: Borrowings 1,059,910.7 15,326.6 Current income tax liabilities 10,176.4 147.2 Deferred income taxes 14,910.4 215.6 Other unallocated financial liabilities 2 86,570.1 1,251.9 Total liabilities Rs. 2,429,052.5 US$ 35,124.9 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable. 1. Includes interest-bearing loans and deposits and accrued interest income. 2. Includes interest accrued and other interest bearing liabilities. a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense. For the year ended/as at March 31, 2018 Automotive and related activity Tata and other brand vehicles * Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable ** Total (In millions) Revenues: External revenue Rs. 494,917.2 Rs. 128,840.3 Rs. 96.3 Rs. 623,853.8 Rs. 26,040.3 Rs. 2,214,492.3 Rs. — Rs. 2,864,386.4 Rs. 18,564.7 Rs. — Rs. 2,882,951.1 Inter-segment/intra-segment revenue — 77.9 — 77.9 111.9 — (111.9 ) 77.9 12,770.0 (12,847.9 ) — Total revenues Rs. 494,917.2 Rs. 128,918.2 Rs. 96.3 Rs. 623,931.7 Rs. 26,152.2 Rs. 2,214,492.3 Rs. (111.9 ) Rs. 2,864,464.3 Rs. 31,334.7 Rs. (12,847.9 ) Rs. 2,882,951.1 Earnings Before Other Income, Interest and Tax (a) 36,694.4 (29,998.8 ) (4,082.1 ) 2,613.5 17,079.3 84,952.3 — 104,645.1 3,045.8 (1,456.3 ) 106,234.6 Finance costs pertaining to borrowings sourced by vehicle financing segment (19,053.0 ) (19,053.0 ) (19,053.0 ) Segment results 36,694.4 (29,998.8 ) (4,082.1 ) 2,613.5 (1,973.7 ) 84,952.3 — 85,592.1 3,045.8 (1,456.3 ) 87,181.6 Share of profit/(loss) of equity accounted investees — — 301.8 301.8 — 21,389.2 — 21,691.0 1,091.6 — 22,782.6 Reconciliation to net income: Assets written off/loss on sale of assets and others (net) (29,148.6 ) Other income/(loss) (net) 47,873.3 Foreign exchange gain/(loss) (net) (4,332.9 ) Interest income 7,122.4 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (27,738.3 ) Income tax expense (37,678.2 ) Net Income Rs. 66,061.9 Depreciation and amortization Rs. 15,417.3 Rs. 14,368.1 Rs. 1,457.4 Rs. 31,242.8 Rs. 183.4 Rs. 177,830.8 Rs. — Rs. 209,257.0 Rs. 561.2 Rs. — Rs. 209,818.2 Capital expenditure Rs. 13,554.5 Rs. 19,145.1 Rs. 859.8 Rs. 33,559.4 Rs. 471.5 Rs. 380,417.9 Rs. — Rs. 414,448.8 Rs. 841.6 Rs. (187.8 ) Rs. 415,102.6 Segment assets Rs. 206,937.3 Rs. 136,472.5 Rs. 63,355.4 Rs. 406,765.2 Rs. 276,709.4 Rs. 1,967,993.9 Rs. (6.0 ) Rs. 2,651,462.5 Rs. 3,303.8 Rs. (12,031.4 ) Rs. 2,642,734.9 Assets classified as held for sale 2,233.3 — — 2,233.3 — — 2,233.3 27,569.1 (3,950.5 ) 25,851.9 Investment in equity accounted investees — — 3,855.0 3,855.0 — 45,023.9 — 48,878.9 — — 48,878.9 Investment in equity accounted investees (held for sale) — — — — — — — — 4,973.5 — 4,973.5 Reconciliation to total assets: Investments 154,214.0 Current and non-current 11,086.4 Deferred income taxes 41,064.6 Other unallocated financial assets 1 306,706.5 Total assets Rs. 3,235,510.7 Segment liabilities Rs. 135,371.8 Rs. 31,371.7 Rs. 27,198.3 Rs. 193,941.8 Rs. 7,244.0 Rs. 1,048,546.1 Rs. (7.1 ) Rs. 1,249,724.8 Rs. 840.2 Rs. (3,152.2 ) Rs. 1,247,412.8 Liabilities classified as held for sale — — — — — — — — 10,701.8 — 10,701.8 Reconciliation to total liabilities: Borrowings 888,706.8 Current income tax liabilities 15,590.7 Deferred income taxes 61,257.8 Other unallocated financial liabilities 2 98,320.0 Total liabilities Rs. 2,321,989.9 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable 1. Includes interest-bearing loans and deposits and accrued interest income. 2. Includes interest accrued and other interest bearing liabilities. a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense. For the year ended March 31, 2017 Automotive and related activity Tata and other brand vehicles* Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable *** Total (In millions) Revenues: External revenue Rs. 414,891.9 Rs. 79,188.1 Rs. — Rs. 494,080.0 Rs. 24,318.3 Rs. 2,120,676.6 Rs. — Rs. 2,639,074.9 Rs. 17,420.2 Rs. — Rs. 2,656,495.1 Inter-segment/intra-segment revenue — 33.1 — 33.1 238.0 — (284.7 ) (13.6 ) 13,734.0 (13,720.4 ) — Total revenues Rs. 414,891.9 Rs. 79,221.2 Rs. — Rs. 494,113.1 Rs. 24,556.3 Rs. 2,120,676.6 Rs. (284.7 ) Rs. 2,639,061.3 Rs. 31,154.2 Rs. (13,720.4 ) Rs. 2,656,495.1 Earnings Before Other Income, Interest and Tax (a) (1,781.7 ) (28,453.7 ) (4,635.8 ) (34,871.2 ) 16,962.2 120,866.8 ** — 102,957.8 3,797.7 (1,942.8 ) 104,812.7 Finance costs pertaining to borrowings sourced by vehicle financing segment (18,465.0 ) (18,465.0 ) (18,465.0 ) Segment results (1,781.7 ) (28,453.7 ) (4,635.8 ) (34,871.2 ) (1,502.8 ) 120,866.8 — 84,492.8 3,797.7 (1,942.8 ) 86,347.7 Share of profit/(loss) of equity accounted investees (net) — — 252.1 252.1 — 13,843.7 — 14,095.8 834.2 — 14,930.0 Reconciliation to net income: Assets written off/loss on sale of assets and others (net) (11,418.6 ) Other income /(loss) (net) 39,590.1 Foreign exchange gain/(loss) (net) (16,590.4 ) Interest income 5,640.7 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (23,900.7 ) Income tax expense (35,035.6 ) Net Income Rs. 59,563.2 Depreciation and amortization Rs. 19,333.6 Rs. 15,666.5 Rs. 1,400.9 Rs. 36,401.0 Rs. 275.3 Rs. 144,472.0 Rs. — Rs. 181,148.3 Rs. 1,257.1 Rs. — Rs. 182,405.4 Capital expenditure 16,562.0 22,506.6 912.2 39,980.8 76.1 269,658.7 — 309,715.6 3,652.3 (1,740.6 ) 311,627.3 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Includes reversal of provision for loss of inventories and insurance recoveries on account of loss of inventories Rs. 13,301.0 million *** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense. Entity-wide disclosures Information concerning principal geographic areas is as follows: Net sales to external customers by geographic area by location of customers: Year ended March 31, 2019 2019 2018 2017 (In millions) India US$ 9,806.2 Rs. 678,148.1 Rs. 578,403.3 Rs. 422,499.1 United States of America 7,411.0 512,511.1 448,881.5 413,469.9 United Kingdom 8,097.7 559,993.0 418,970.3 486,091.5 Rest of Europe 6,537.3 452,087.8 470,288.0 469,926.9 China 4,394.9 303,929.1 481,675.0 410,721.9 Rest of the World 7,042.1 486,993.3 484,733.0 453,785.8 Total revenues US$ 43,289.2 Rs. 2,993,662.4 Rs. 2,882,951.1 Rs. 2,656,495.1 Non-current non-current As at March 31, 2019 2019 2018 (In millions) India US$ 3,596.6 Rs. 248,726.3 Rs. 224,623.2 United States of America 42.2 2,919.9 2,990.0 United Kingdom 14,186.4 981,062.7 1,211,921.5 Rest of Europe 1,369.5 94,708.0 72,420.6 China 20.4 1,409.2 1,661.1 Rest of the World 363.5 25,137.5 26,977.3 Total US$ 19,578.6 Rs. 1,353,963.6 Rs. 1,540,593.7 Information about product revenues: Year ended March 31, 2019 2019 2018 2017 (In millions) Tata and Fiat vehicles US$ 9,863.0 Rs. 682,076.2 Rs. 575,483.5 Rs. 436,306.2 Tata Daewoo commercial vehicles 564.6 39,042.9 48,370.3 57,773.8 Jaguar Land Rover vehicles 32,053.5 2,216,656.9 2,214,492.3 2,120,676.6 Others 316.5 21,890.9 18,564.7 17,420.2 Sub-total 42,797.6 2,959,666.9 2,856,910.8 2,632,176.8 Finance revenues 491.6 33,995.5 26,040.3 24,318.3 Total revenues US$ 43,289.2 Rs. 2,993,662.4 Rs. 2,882,951.1 Rs. 2,656,495.1

Related-party transactions

Related-party transactions	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Related-party transactions	40. Related-party transactions The Company’s related parties principally consist of Tata Sons Private Limited, subsidiaries and joint ventures of Tata Sons Private Limited, the Company’s associates and their subsidiaries, joint operations and joint ventures of the Company. The Company routinely enters into transactions with these related parties in the ordinary course of business. The Company enters into transactions for sale and purchase of products and services with its associates, joint operations and joint ventures. Transactions and balances with its own subsidiaries are eliminated on consolidation. The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2019: Associates subsidiaries Joint ventures Joint operations Tata Sons Pvt Ltd, its subsidiaries and Total Total (In millions) Purchase of products Rs. 23,691.0 Rs. 24.6 Rs. 39,407.7 Rs. 2,028.0 Rs. 65,151.3 US$ 942.1 Sale of products 3,284.0 29,465.5 8,253.2 8,281.0 49,283.7 712.7 Services received 462.0 11.3 — 18,668.0 19,141.3 276.8 Services rendered 217.0 7,653.2 60.4 1,163.0 9,093.6 131.5 Acceptances — — — 54,937.8 54,937.8 794.4 Purchase of property, plant and equipment 135.0 — — 8.0 143.0 2.1 Purchase of investments 72.0 — — — 72.0 1.0 Sale of investments — — — 5,333.5 5,333.5 77.1 Interest (income)/expense, dividend (income)/paid, (net) (124.0 ) (1,991.3 ) (262.2 ) 231.0 (2,146.5 ) (31.0 ) Loans given — 57.5 — — 57.5 0.8 Loans taken 1,770.0 — — — 1,770.0 25.6 Loans repaid by us 2,100.0 — — — 2,100.0 30.4 Amounts receivable in respect of loans and interest thereon — 37.5 — 38.0 75.5 1.1 Amounts payable in respect of loans and interest thereon 230.0 — — 36.0 266.0 3.8 Trade and other receivables 556.0 1,321.5 — 1,988.0 3,865.5 55.9 Accounts payable 3,043.0 25.9 2,461.2 3,729.0 9,259.1 133.9 Acceptances — — — 691.3 691.3 10.0 The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2018: Associates Joint Joint Tata Sons Total (In millions) Purchase of products Rs. 26,057.0 Rs. — Rs. 31,631.0 Rs. 1,713.0 Rs. 59,401.0 Sale of products 2,016.0 60,082.1 5,454.9 7,091.0 74,644.0 Services received 89.0 5,500.9 1.6 17,353.0 22,944.5 Services rendered 190.0 12,077.2 43.4 241.0 12,551.6 Acceptances — — — 41,350.3 41,350.3 Purchase of property, plant and equipment 624.0 — — 2.0 626.0 Purchase of investments — 25.0 — — 25.0 Interest (income)/expense, dividend (income)/paid, (net) (95.0 ) (17,644.9 ) (46.0 ) 263.0 (17,522.9 ) Loans taken 4,890.0 — — — 4,890.0 Loans repaid by us 4,890.0 — — — 4,890.0 Amounts receivable in respect of loans and interest thereon — — — 40.0 40.0 Amounts payable in respect of loans and interest thereon 560.0 — — 48.0 608.0 Trade and other receivables 633.0 10,371.4 (0.7 ) 1,511.0 12,514.7 Accounts payable 1,496.0 2.5 1,848.8 3,357.0 6,704.3 Acceptances — — — 2,201.6 2,201.6 Deposit given as security — — — 30.0 30.0 The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2017: Associates Joint ventures Joint operations Tata Sons Total (In millions) Purchase of products Rs. 20,585.2 Rs. 213.0 Rs. 22,757.5 Rs. 668.4 Rs. 44,224.1 Sale of products 2,504.9 49,835.3 3,237.2 4,615.0 60,192.4 Services received 109.8 10,885.7 0.7 19,701.5 30,697.7 Services rendered 166.4 7,718.8 161.2 1,301.3 9,347.7 Acceptances — — — 32,027.7 32,027.7 Purchase of property, plant and equipment 137.9 — — 1.1 139.0 Interest (income)/expense, dividend (income)/paid, (net) (111.0 ) (5,943.6 ) (121.2 ) 642.6 (5,533.2 ) Amounts receivable in respect of loans and interest thereon — — — 93.3 93.3 Amounts payable in respect of loans and interest thereon 560.0 — — 1,055.5 1,615.5 Trade and other receivables 495.2 5,658.6 — 1,600.1 7,753.9 Accounts payable 397.6 226.3 1,239.6 4,711.1 6,574.6 Conversion of Optionally Convertible Preference shares in to equity shares 1,600.0 — — — 1,600.0 Loans given — — — 303.0 303.0 Loans given, repaid — — 1,325.0 603.0 1,928.0 Loans taken 3,290.0 — — 5,896.3 9,186.3 Loans repaid by us 3,000.0 — — 6,269.5 9,269.5 Deposit given as security — — — 30.0 30.0 Note: With the introduction of GST from July 1, 2017, the related party transactions reported do not include indirect tax component. The previous period figures to that extent are not comparable. Compensation of key management personnel: Year ended March 31, 2019 2019 2018 2017 (In millions) Short-term benefits US$ 9.2 Rs. 633.9 Rs. 798.4 Rs. 693.1 Post-employment benefits* 0.8 54.6 17.6 184.7 Share based payment US$ 0.1 Rs. 4.4 Rs. — Rs. — * Excludes provision for encashable leave and gratuity for certain key management personnel as a separate actuarial valuation is not available. Other transactions with key management personnel: Year ended March 31, 2019 2019 2018 2017 (In millions) Sale of products US$ — Rs. — Rs. — Rs. 8.1 Dividend paid US$ — Rs. — Rs. — Rs. — ** Refer note 35 for information on transactions with post-employment benefit plans. ** amount less than Rs. 50,000

Earnings per share ("EPS")

Earnings per share ("EPS")	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Earnings per share ("EPS")	41. Earnings per share (“EPS”) Net income Weighted Earnings per For the year ended March 31, 2019: Ordinary Shares Basic net earnings per share Rs. (249,246.9 ) 2,887,348,474 Rs. (86.3 ) US$ (3,604.2 ) US$ (1.2 ) Effect of shares kept in abeyance Rs. # # Rs. # US$ # # US$ # Diluted earnings per share Rs. (249,246.9 ) 2,887,348,474 Rs. (86.3 ) US$ (3,604.2 ) US$ (1.2 ) ‘A’ Ordinary Shares Basic net earnings per share Rs. (43,895.8 ) 508,502,371 Rs. (86.3 ) US$ (634.7 ) US$ (1.2 ) Effect of shares kept in abeyance Rs. # # Rs. # US$ # # US$ # Diluted earnings per share Rs. (43,895.8 ) 508,502,371 Rs. (86.3 ) US$ (634.7 ) US$ (1.2 ) For the year ended March 31, 2018: Ordinary Shares Basic net earnings per share Rs. 55,258.1 2,887,348,357 Rs. 19.1 Effect of shares kept in abeyance Rs. (2.4 ) 494,469 Rs. (4.9 ) Diluted earnings per share Rs. 55,255.7 2,887,842,826 Rs. 19.1 ‘A’ Ordinary Shares Basic net earnings per share Rs. 9,782.6 508,502,336 Rs. 19.2 Effect of shares kept in abeyance Rs. 2.4 233,774 Rs. 10.3 Diluted earnings per share Rs. 9,785.0 508,736,110 Rs. 19.2 For the year ended March 31, 2017: Ordinary Shares Basic net earnings per share Rs. 49,730.2 2,887,218,310 Rs. 17.2 Effect of shares kept in abeyance Rs. (2.2 ) 599,766 Rs. (3.7 ) Diluted earnings per share Rs. 49,728.0 2,887,818,076 Rs. 17.2 ‘A’ Ordinary Shares Basic net earnings per share Rs. 8,809.1 508,483,714 Rs. 17.3 Effect of shares kept in abeyance Rs. 2.2 252,396 Rs. 8.7 Diluted earnings per share Rs. 8,811.3 508,736,110 Rs. 17.3 ‘A’ Ordinary shareholders are entitled to receive dividend at 5 percentage points more than the aggregate rate of dividend determined by the Company on Ordinary shares for the financial year. # Since there is a loss for the year ended March 31, 2019 potential equity shares are not considered as dilutive and hence Diluted EPS is same as Basic EPS. Options are dilutive when they result in the issue of ordinary shares for less than the average market price of ordinary shares during the period. Based on the market price as on date, these are not considered to be dilutive.

Held for sale assets and liabil

Held for sale assets and liabilities	12 Months Ended
	Mar. 31, 2019
Investments accounted for using equity method [abstract]
Held for sale assets and liabilities	42. Held for sale assets and liabilities As at March 31, 2019, certain assets of the Company related to defence business are classified as “Held for Sale” as they meet the criteria laid out under IFRS 5. Given the delay in completing the sale, the Company has reassessed the position on “Held for Sale” for the assets and liabilities of its subsidary Tata Technologies Ltd and investment in Tata Hitachi Construction Machinery Company Private Limited (equity accounted investees). Accordingly, the Company concluded that these assets and liabilities no longer meet the criteria of “Held for Sale” as per IFRS 5. The below table outlines various assets and liabilities classifed as held for sale. As at March 31, 2019 2019 2018 (In millions) ASSETS: Current assets: Cash and cash equivalents US$ — Rs. — Rs. 2,439.4 Short-term deposits — — 201.2 Trade receivables — — 5,245.8 Other financial assets — — 319.0 Inventories — — 958.0 Other current assets — — 584.6 Current income tax assets — — 726.4 Total current assets — — 10,474.5 Non-current Investments — — 317.9 Other financial assets — — 546.9 Property, plant and equipment 0.2 11.4 4,545.3 Goodwill — — 5,579.1 Intangible assets 23.3 1,611.0 3,076.1 Non-current — — 318.4 Deferred income taxes — — 211.6 Other non-current — — 782.1 Total non-current 23.5 1,622.4 15,377.4 Total assets US$ 23.5 Rs. 1,622.4 Rs. 25,851.9 LIABILITIES Current liabilities: Accounts payable — — 3,926.4 Short-term borrowings and current portion of long-term debt — — 939.0 Other financial liabilities — — 67.0 Provisions — — 117.1 Other current liabilities — — 1,844.1 Current income tax liabilities — — 714.3 Total current liabilities — — 7,607.9 Non-current Long-term debt — — 486.5 Other financial liabilities — — 13.4 Provisions — — 297.0 Other liabilities — — 2,296.9 Total non-current — — 3,093.9 Total liabilities US$ — Rs. — Rs. 10,701.8

Tata Motors Limited ("Parent Co

Tata Motors Limited ("Parent Company")	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Tata Motors Limited ("Parent Company")	43. Tata Motors Limited (“Parent Company”)—condensed financial information as to financial position, cash flows and results of operations has not been provided, as per the requirements of Rule 12-04 (a) of Regulation S-X, because restricted net assets of the consolidated subsidiaries does not exceed 25% of the consolidated net assets as at March 31, 2019. As at March 31, 2019 and 2018, Rs. 127,705.6 million and Rs. 429,855.1 million, respectively, of restricted assets were not available for distribution.

Subsidiaries

Subsidiaries	12 Months Ended
	Mar. 31, 2019
Investments accounted for using equity method [abstract]
Subsidiaries	44. We had the following subsidiaries as at March 31, 2019: Sr. No. Name of the Subsidiary Company Country of % of Equity 1 Concorde Motors (India) Limited India 100.00 2 Tata Motors European Technical Centre PLC UK 100.00 3 Tata Motors Insurance Broking and Advisory Services Limited India 100.00 4 TMF Holdings Limited (formerly known as Tata Motors Finance Limited) India 100.00 5 TML Holdings Pte. Limited Singapore 100.00 6 TML Distribution Company Limited India 100.00 7 Tata Hispano Motors Carrocera S.A. Spain 100.00 8 Tata Hispano Motors Carrocerries Maghreb SA Morocco 100.00 9 Trilix S.r.l. Italy 100.00 10 Tata Precision Industries Pte. Limited Singapore 78.39 11 Tata Technologies Limited India 72.28 12 Tata Marcopolo Motors Limited India 51.00 (B) INDIRECT SUBSIDIARIES (i) Subsidiaries of TML Holdings Pte. Ltd. 13 Tata Daewoo Commercial Vehicle Company Limited South Korea 100.00 14 Tata Daewoo Commercial Vehicle Sales and Distribution Company Limited South Korea 100.00 15 Tata Motors (Thailand) Limited Thailand 95.87 16 Tata Motors (SA) (Proprietary) Limited South Africa 60.00 17 PT Tata Motors Indonesia Indonesia 100.00 18 PT Tata Motors Distribusi Indonesia Indonesia 100.00 19 TMNL Motor Services Nigeria Limited Nigeria 100.00 20 Jaguar Land Rover Automotive Plc UK 100.00 (ii) Subsidiaries of Jaguar Land Rover Automotive Plc 21 Jaguar Land Rover Holdings Limited UK 100.00 (iii) Subsidiaries of Jaguar Land Rover Holdings Limited 22 Jaguar Land Rover Limited UK 100.00 23 Jaguar Land Rover Austria GmbH Austria 100.00 24 Jaguar Land Rover Japan Limited Japan 100.00 25 JLR Nominee Company Limited UK 100.00 26 Jaguar Land Rover Deutschland GmbH Germany 100.00 27 Jaguar Land Rover North America LLC USA 100.00 28 Jaguar Land Rover Nederland BV Netherlands 100.00 29 Jaguar Land Rover Portugal - Veículos e Peças, Lda. Portugal 100.00 30 Jaguar Land Rover Australia Pty Limited Australia 100.00 31 Jaguar Land Rover Italia Spa Italy 100.00 32 Jaguar Land Rover Korea Company Limited South Korea 100.00 33 Jaguar Land Rover (China) Investment Co. Limited China 100.00 34 Jaguar Land Rover Canada ULC Canada 100.00 35 Jaguar Land Rover France, SAS France 100.00 36 Jaguar Land Rover (South Africa) (Pty) Limited South Africa 100.00 37 Jaguar e Land Rover Brasil Indústria e Comércio de Veículos LTDA Brazil 100.00 38 Limited Liability Company “Jaguar Land Rover” (Russia) Russia 100.00 39 Jaguar Land Rover (South Africa) Holdings Limited South Africa 100.00 40 Jaguar Land Rover India Limited India 100.00 41 Jaguar Land Rover Espana SL Spain 100.00 42 Jaguar Land Rover Belux NV Belgium 100.00 43 Jaguar Cars South Africa (Pty) Limited South Africa 100.00 44 The Jaguar Collection Limited UK 100.00 45 Jaguar Cars Limited UK 100.00 46 Land Rover Exports Limited UK 100.00 47 Land Rover Ireland Limited Ireland 100.00 48 The Daimler Motor Company Limited UK 100.00 49 Daimler Transport Vehicles Limited UK 100.00 50 S.S. Cars Limited UK 100.00 51 The Lanchester Motor Company Limited UK 100.00 52 Shanghai Jaguar Land Rover Automotive Services Company Limited China 100.00 53 Jaguar Land Rover Pension Trustees Limited UK 100.00 54 Jaguar Land Rover Slovakia s.r.o Slovakia 100.00 55 Jaguar Land Rover Singapore Pte. Ltd. Singapore 100.00 56 Jaguar Racing Limited UK 100.00 57 InMotion Ventures Limited UK 100.00 58 InMotion Ventures 1 Limited UK 100.00 59 InMotion Ventures 2 Limited UK 100.00 60 InMotion Ventures 3 Limited UK 100.00 61 InMotion Ventures 4 Limited UK 100.00 62 Jaguar Land Rover Colombia S.A.S Columbia 100.00 63 Jaguar Land Rover Ireland (Services) Limited Ireland 100.00 64 Jaguar Land Rover Taiwan Company Limited Taiwan 100.00 65 Jaguar Land Rover Servicios México, S.A. de C.V. Mexico 100.00 66 Jaguar Land Rover México, S.A.P.I. de C.V. Mexico 100.00 67 Jaguar Land Rover Hungary KFT Hungary 100.00 68 Jaguar Land Rover Classic USA LLC USA 100.00 69 Spark44 (JV) Limited UK 50.50 (iv) Subsidiaries of Spark44 (JV) Limited 70 Spark44 Pty. Ltd. Australia 50.50 71 Spark44 GmbH Germany 50.50 72 Spark44 LLC USA 50.50 73 Spark44 Shanghai Limited China 50.50 74 Spark44 DMCC UAE 50.50 75 Spark44 Demand Creation Partners Pvt. Limited India 50.50 76 Spark44 Limited UK 50.50 77 Spark44 Singapore Pte. Ltd. Singapore 50.50 78 Spark44 Communications SL Spain 50.50 79 Spark44 S.r.l. Italy 50.50 80 Spark44 Seoul Limited Korea 50.50 81 Spark44 Japan K.K. Japan 50.50 82 Spark44 Canada Inc Canada 50.50 83 Spark44 Pty. Limited South Africa 50.50 84 Spark44 Colombia S.A.S. Columbia 50.50 85 Spark44 Taiwan Limited Taiwan 50.50 (v) Subsidiaries of Tata Technologies Limited 86 Tata Technologies Pte Limited Singapore 72.28 87 Tata Technologies (Thailand) Limited Thailand 72.28 88 Tata Manufacturing Technologies (Shanghai) Limited China 72.28 89 INCAT International Plc. UK 72.28 90 INCAT GmbH Germany 72.28 91 Tata Technologies Europe Limited UK 72.28 92 Escenda Engineering AB Sweden 72.28 93 Tata Technologies Inc. USA 72.35 94 Tata Technologies de Mexico, S.A. de C.V. Mexico 72.35 95 Cambric GmbH Germany 72.35 96 Cambric Limited USA 72.32 97 Tata Technologies SRL Romania Romania 72.32 (vi) Subsidiaries of TMF Holdings Ltd. 98 Tata Motors Finance Solutions Limited India 100.00 99 Tata Motors Finance Limited India 100.00

Significant accounting polici_2

Significant accounting policies (Policies)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Statement of compliance	a. Statement of compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (referred to as “IFRS”) as issued by the International Accounting Standards Board (referred to as “IASB”).
Basis of preparation	Basis of preparation The consolidated financial statements have been prepared on historical cost basis except for certain financial instruments measured at fair value at the end of each reporting period as explained in the accounting policies below.
Basis of consolidation	c. Basis of consolidation Subsidiaries The consolidated financial statements include Tata Motors Limited and its subsidiaries. Subsidiaries are entities controlled by the Company. Control exists when the Company (a) has power over the investee, (b) it is exposed, or has rights, to variable returns from its involvement with the investee and (c) has the ability to affect those returns through its power over the investee. The Company reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements listed above. In assessing control, potential voting rights that currently are exercisable are taken into account. The results of subsidiaries acquired or disposed of during the year are included in the consolidated financial statements from the effective date of acquisition and up to the effective date of disposal, as appropriate. Inter-company transactions and balances including unrealized profits are eliminated on consolidation. Non-controlling non-controlling non-controlling acquisition-by-acquisition non-controlling non-controlling non-controlling non-controlling Changes in the Company’s interests in subsidiaries that do not result in a loss of control are accounted for as equity transactions. The carrying amount of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, the profit or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling Financial Instruments Recognition and Measurement Interests in joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint operations Certain of the Company’s activities, are conducted through joint operations, which are joint arrangements whereby the parties that have joint control of the arrangement have rights to the assets, and obligations for the liabilities, relating to the arrangement. The Company recognizes, in the consolidated financial statements, its share of the assets, liabilities, income and expenses of these joint operations incurred jointly with the other partners, along with its share of income from the sale of the output and any assets, liabilities and expenses that it has incurred in relation to the joint operation. Joint ventures A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement have rights to the net assets of the arrangement. The results, assets and liabilities of a joint venture are incorporated in these financial statements using the equity method of accounting as described below. Associates Associates are those entities in which the Company has significant influence. Significant influence is the power to participate in the financial and operating policy decisions of the investee but not control or joint control of those policies. Significant influence is presumed to exist when the Company holds between 20 and 50 percent of the voting power of another entity. The results, assets and liabilities of associates are incorporated in these financial statements using the equity method of accounting as described below. Equity method of accounting (equity accounted investees) An interest in an associate or joint venture is accounted for using the equity method from the date in which the investee becomes an associate or a joint venture and are recognized initially at cost. The Company’s investment includes goodwill identified on acquisition, net of any accumulated impairment losses. The consolidated financial statements include the Company’s share of profits or losses and equity movements of equity accounted investees, from the date that significant influence or joint control commences until the date that significant influence or joint control ceases. When the Company’s share of losses exceeds its interest in an equity accounted investee, the carrying amount of that interest (including any long-term investments in the nature of net investments) is reduced to nil and the recognition of further losses is discontinued except to the extent that the Company has an obligation or has made payments on behalf of the investee. When the Company transacts with an associate or joint venture of the Company, unrealized profits and losses are eliminated to the extent of the Company’s interest in its associate or joint venture.
Business Combinations	Business Combinations Acquisitions of subsidiaries and businesses are accounted for using the acquisition method. Acquisition related costs are recognized in profit or loss as incurred. The acquiree’s identifiable assets, liabilities and contingent liabilities that meet the conditions for recognition are recognized at their fair value at the acquisition date, except certain assets and liabilities required to be measured as per the applicable standard. Purchase consideration in excess of the Company’s interest in the acquiree’s net fair value of identifiable assets, liabilities and contingent liabilities is recognized as goodwill. Excess of the Company’s interest in the net fair value of the acquiree’s identifiable assets, liabilities and contingent liabilities over the purchase consideration is recognized, after reassessment of fair value of net assets acquired, in the income statement.
Use of estimates and judgments	Use of estimates and judgments The preparation of financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income, expenses and disclosures of contingent assets and liabilities at the date of these financial statements and the reported amounts of revenues and expenses for the years presented. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed at each balance sheet date. Revisions to accounting estimates are recognized in the period in which the estimate is revised and future periods affected. In particular, information about significant areas of estimation, uncertainty and critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the financial statements are included in the following notes: i) Note 13, 16 and 17 – Property, plant and equipment and intangible assets - useful lives and impairment, capitalization of product development costs ii) Note 15 – Impairment of goodwill iii) Note 17 – Impairment of indefinite life intangible assets iv) Note 19 – Recoverability/recognition of deferred tax assets v) Note 24 – Provision for product warranty vi) Note 35 – Measurement of assets and obligations relating to employee benefits vii) Note 4 – Allowances for credit losses for finance receivables viii) Estimated discounts / incentives required to be paid to dealers on retail of vehicles previously wholesaled
Revenue recognition	Revenue recognition The Company generates revenue principally from – a) Sale of products - (i) The Company recognizes revenues on the sale of products, net of discounts, sales incentives, customer bonuses and rebates granted, when products are delivered to dealers or when delivered to a carrier for export sales, which is when control including risks and rewards and title of ownership pass to the customer. Sale of products is presented net of excise duty where applicable and other indirect taxes. The consideration received in respect of transport arrangements for delivering of vehicles to the customers are recognized net of their costs within revenues in the income statement. Revenues are recognized when collectability of the resulting receivable is reasonably assured. b) Sale of services - maintenance service and extended warranties for commercial and passenger vehicles, software support services and insurance broking services. Income from sale of maintenance services and extended warranties, including software services are recognized as income over the relevant period of service or extended warranty. When the Company sells products that are bundled with maintenance service or extended period of warranty, such services are treated as a separate performance obligation only if the service or warranty is optional to the customer or includes an additional service component. In such cases, the transaction price allocated towards such maintenance service or extended period of warranty is recognized as a contract liability until the service obligation has been met. The Company operates certain customer loyalty programs under which customer is entitled to reward points on the spend towards Company’s products. The reward points earned by customers can be redeemed to claim discounts on future purchase of certain products or services. Transaction price allocated towards reward points granted to customers is recognized as a deferred income liability and transferred to income when customers redeem their reward points. For certain sale of services wherein performance obligation is satisfied over a period of time, any amount received in advance is recorded as contract liability and recognized as revenue when service is rendered to customers. Any amount of income accrued but not billed to customers in respect of such contracts is recorded as a contract asset. Such contract assets are transferred to trade receivables on actual billing to customers. Refund liabilities comprise of obligation to customers to pay for discounts and sales incentives. Proceeds from sale of vehicles for which the Company or any of its subsidiaries have retained buy back obligation in future is recorded as a liabilities – (i) Proceeds received in excess of agreed buy back price is recognized as Deferred income liability and (ii) the agreed buy back price is recognized as Buy back liability. Deferred income liability is recognized on a straight line basis over the term of the agreement. c) Financing revenues - Interest income from financing transactions and income from leasing of vehicles to customers. Finance and service charges are accrued on the unpaid principal balance of finance receivables using the effective interest method. d) Refer annual report for the fiscal year ended March 31, 2018 for accounting policies applied by the Company with respect to revenue recognition for fiscal years ended March 31, 2018 and 2017.
Government grants and incentives	g. Government grants and incentives Other income includes export and other recurring and non-recurring These are recognized in the consolidated statement of profit and loss, either on a systematic basis when the Company recognises, as expenses, the related costs that the grants are intended to compensate or, immediately if the costs have already been incurred. Government grants related to assets are netted off from the carrying value of related assets. Government grants related to income are presented as an offset against the related expenditure, and government grants that are awarded as incentives with no ongoing performance obligations to the Company are recognized as income in the period in which the grant is received.
Cost recognition	h. Cost recognition Costs and expenses are recognized when incurred and are classified according to their nature. Expenditure capitalized represents employee costs, stores and other manufacturing supplies, and other expenses incurred for construction including product development undertaken by the Company.
Provisions	Provisions A provision is recognized if, as a result of a past event, the Company has a present legal or constructive obligation that can be estimated reliably, and it is probable that an outflow of economic benefits will be required to settle the obligation. Provisions are determined by discounting the expected future cash flows at a pre-tax i) Product warranty expenses The estimated liability for product warranties is recorded when products are sold. These estimates are established using historical information on the nature, frequency and average cost of warranty claims and management estimates regarding possible future incidences based on actions on product failures. The timing of outflows will vary as and when warranty claim will arise, being typically up to six years. The Company also has back-to-back ii) Residual risk In certain markets, the Company is responsible for the residual risk arising on vehicles sold by dealers under leasing arrangements. The provision is based on the latest available market expectations of future residual value trends. The timing of the outflows will be at the end of the lease arrangements – being typically up to three years. iii) Legal and product liability Legal and product liability provision is recorded in respect of compliance with regulations and known litigations which impact the Company. The product liability claim primarily relates to motor accident claims, consumer complaints, dealer/supplier terminations, personal injury claims and compliance with regulations. iv) Environmental liability Environmental liability relates to various environmental remediation cost such as asbestos removal and land clean up. The timing of when these costs will be incurred is not known with certainty.
Foreign currency	j. Foreign currency These consolidated financial statements are presented in Indian rupees, which is the functional currency of Tata Motors Limited. Transactions in foreign currencies are recorded at the exchange rate prevailing on the date of transaction. Foreign currency denominated monetary assets and liabilities are re-measured For the purpose of consolidation, the assets and liabilities of the Company’s foreign operations are translated to Indian rupees at the exchange rate prevailing on the balance sheet date, and the income and expenses at the average rate of exchange for the respective months. Exchange differences arising are recognized as currency translation reserve under equity. Exchange differences arising from the translation of foreign operations previously recognized in currency translation reserve in equity are not reclassified from equity to the income statement until the disposal of such operation.
Income taxes	Income taxes Income tax expense comprises current and deferred taxes. Income tax expense is recognized in the income statement except when they relate to items that are recognized outside profit or loss (whether in other comprehensive income or directly in equity), in which case tax is also recognized outside profit or loss, or where they arise from the initial accounting for business combination. In the case of a business combination the tax effect is included in accounting for the business combination. Current income taxes are determined based on respective taxable income of each taxable entity and tax rules applicable for respective tax jurisdictions. Deferred tax assets and liabilities are recognized for the future tax consequences of temporary differences between the carrying values of assets and liabilities and their respective tax bases, and unutilized business loss and depreciation carry-forwards and tax credits. Such deferred tax assets and liabilities are computed separately for each taxable entity and for each taxable jurisdiction. Deferred tax assets are recognized to the extent that it is probable that future taxable income will be available against which the deductible temporary differences, unused tax losses, depreciation carry-forwards and unused tax credits could be utilized. Deferred tax assets and liabilities are measured based on the tax rates that are expected to apply in the period when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted by the balance sheet date. Current and Deferred tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax liabilities and when they relate to income taxes levied by the same taxation authority and the Company intends to settle its current tax assets and liabilities on a net basis.
Earnings per share	Earnings per share Basic earnings per share has been computed by dividing net income by the weighted average number of shares outstanding during the year. Partly paid up shares are included as fully paid equivalents according to the fraction paid up. Diluted earnings per share has been computed using the weighted average number of shares and dilutive potential shares, except where the result would be anti-dilutive.
Inventories	Inventories Inventories (other than those recognized consequent to the sale of vehicles subject to repurchase arrangements) are valued at the lower of cost and net realizable value. Cost of raw materials, components and consumables are ascertained on a first in first out basis. Cost, including fixed and variable production overheads, are allocated to work-in-progress Inventories include vehicles sold subject to repurchase arrangements. These vehicles are carried at cost to the Company and are amortized in changes in inventories of finished goods to their residual values (i.e., estimated second hand sale value) over the term of the arrangement.
Property, plant and equipment	n. Property, plant and equipment Property, plant and equipment are stated at cost of acquisition or construction less accumulated depreciation less accumulated impairment, if any. Freehold land is measured at cost and is not depreciated. Heritage assets, comprising antique vehicles purchased by the Company, are not depreciated as they are considered to have a residual value in excess of cost. Residual values are re-assessed Cost includes purchase price, taxes and duties, labor cost and direct overheads for self-constructed assets and other direct costs incurred up to the date the asset is ready for its intended use. Interest cost incurred for constructed assets is capitalized up to the date the asset is ready for its intended use, based on borrowings incurred specifically for financing the asset or the weighted average rate of all other borrowings, if no specific borrowings have been incurred for the asset. Depreciation is provided on a straight-line basis over estimated useful lives of the assets. Estimated useful lives of the assets are as follows: Type of Asset Estimated useful life Buildings 20 to 60 years Plant and equipment 3 to 30 years Computers 3 to 6 years Vehicles 3 to 11 years Furniture and fixtures 3 to 21 years Assets held under finance leases are depreciated over their expected useful lives on the same basis as owned assets or, where shorter, the term of the relevant lease. The depreciation period is reviewed at least at each year–end. Changes in expected useful lives are treated as changes in accounting estimates. Depreciation is not recorded on capital work-in-progress Capital-work-in-progress
Intangible assets	Intangible assets Intangible assets purchased, including those acquired in business combinations, are measured at cost or fair value as of the date of acquisition where applicable less accumulated amortization and accumulated impairment, if any. Intangible assets with indefinite lives are reviewed annually to determine whether indefinite-life assessment continues to be supportable. If not, the change in the useful-life assessment from indefinite to finite is made on a prospective basis. Amortization is provided on a straight-line basis over estimated useful lives of the intangible assets as per details below: Type of Asset Estimated Patents and technological know-how 2 to 12 years Customer related intangibles–Dealer network 20 years Intellectual property rights 3 to 10 years Software 1 to 8 years The amortization period for intangible assets with finite useful lives is reviewed at least at each year-end. Capital work-in-progress Internally generated intangible asset Research costs are charged to the income statement in the year in which they are incurred. Product development costs incurred on new vehicle platform, engines, transmission and new products are recognized as intangible assets, when feasibility has been established, the Company has committed technical, financial and other resources to complete the development and it is probable that asset will generate probable future economic benefits. The costs capitalized include the cost of materials, direct labor and directly attributable overhead expenditure incurred up to the date the asset is available for use. Interest cost incurred is capitalized up to the date the asset is ready for its intended use, based on borrowings incurred specifically for financing the asset or the weighted average rate of all other borrowings if no specific borrowings have been incurred for the asset. Product development cost is amortized over a period of 24 months to 120 months. Capitalized development expenditure is measured at cost less accumulated amortization and accumulated impairment, if any. In Fiscal 2018, assets written off/loss on sale of assets and other (net) amounting to Rs.29,148.6 million has been presented as a separate line in the income statement. Previously, these were included and presented in the income statement within the line item “Other (income)/loss (net). The change in presentation has been retrospectively applied for full periods presented. The change in presentation does not affect Net income, Total comprehensive income and earnings per share in any of the periods presented.
Leases	Leases At the inception of a lease, the lease arrangement is classified as either a finance lease or an operating lease, based on the substance of the lease arrangement. Assets taken on finance lease A finance lease is recognized as an asset and a liability at the commencement of the lease, at the lower of the fair value of the asset and the present value of the minimum lease payments. Initial direct costs, if any, are also capitalized and, subsequent to initial recognition, the asset is accounted for in accordance with the accounting policy applicable to that asset. Minimum lease payments made under finance leases are apportioned between the finance expense and the reduction of the outstanding liability. The finance expense is allocated to each period during the lease term so as to produce a constant periodic rate of interest on the remaining balance of the liability. Assets taken on operating lease Leases other than finance leases are operating leases which are not recognized on the Company’s balance sheet. Payments made under operating leases are recognized in the income statement on a straight-line basis over the term of the lease.
Impairment	Impairment i) Goodwill Cash generating units to which goodwill is allocated are tested for impairment annually at each balance sheet date, or more frequently when there is an indication that the unit may be impaired. If the recoverable amount of the cash generating unit is less than the carrying amount of the unit, the impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to that unit and then to the other assets of the unit pro rata on the basis of carrying amount of each asset in the unit. Goodwill impairment loss recognized is not reversed in subsequent period. ii) Property, plant and equipment and other intangible assets At each balance sheet date, the Company assesses whether there is any indication that any property, plant and equipment and intangible assets with finite lives may be impaired. If any such impairment exists the recoverable amount of an asset is estimated to determine the extent of impairment, if any. Where it is not possible to estimate the recoverable amount of an individual asset, the Company estimates the recoverable amount of the cash-generating unit to which the asset belongs. Intangible assets with indefinite useful lives and intangible assets not yet available for use, are tested for impairment annually at each balance sheet date, or earlier, if there is an indication that the asset may be impaired. Recoverable amount is the higher of fair value less costs to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax If the recoverable amount of an asset (or cash-generating unit) is estimated to be less than its carrying amount, the carrying amount of the asset (or cash-generating unit) is reduced to its recoverable amount. An impairment loss is recognized immediately in the income statement.
Employee benefits	Employee benefits i) Pension plans The Jaguar Land Rover subsidiaries operate several defined benefit pension plans, which are contracted out of the second state pension scheme until April 5, 2016. The assets of the plan are held in separate trustee administered funds. The plans provide for monthly pension after retirement as per salary drawn and service period as set out in rules of each fund. Contributions to the plans by the subsidiary group take into consideration the results of actuarial valuations. The plans with a surplus position at the year-end A separate defined contribution plan is available to employees of Jaguar Land Rover. Costs in respect of this plan are charged to the income statement as incurred. ii) Gratuity Tata Motors Limited and its subsidiaries and joint operations in India have an obligation towards gratuity, a defined benefit retirement plan covering eligible employees. The plan provides for a lump-sum Tata Motors Limited and its subsidiaries and joint operations in India account for the liability for gratuity benefits payable in the future based on an actuarial valuation. iii) Superannuation Tata Motors Limited and some of its subsidiaries in India have two superannuation plans, a defined benefit plan and a defined contribution plan. An eligible employee on April 1, 1996 could elect to be a member of either plan. Employees who are members of the defined benefit superannuation plan are entitled to benefits depending on the years of service and salary drawn. The monthly pension benefits after retirement range from 0.75% to 2% of the annual basic salary for each year of service. Tata Motors Limited and such subsidiaries account for superannuation benefits payable in future under the plan based on an actuarial valuation. With effect from April 1, 2003, this plan was amended and benefits earned by covered employees have been protected as at March 31, 2003. Employees covered by this plan are prospectively entitled to benefits computed on a basis that ensures that the annual cost of providing the pension benefits would not exceed 15% of salary. During the year ended March 31, 2015, the employees covered by this plan were given a one-time one- Separate irrevocable trusts are maintained for employees covered and entitled to benefits. Tata Motors Limited and its subsidiaries contribute up to 15% or Rs.150,000, whichever is lower, of the eligible employees’ salary to the trust every year. Such contributions are recognized as an expense when incurred. Tata Motors Limited and such subsidiaries have no further obligation beyond this contribution. iv) Bhavishya Kalyan Yojana (BKY) Bhavishya Kalyan Yojana is an unfunded defined benefit plan for employees of Tata Motors Limited and some of its subsidiaries. The benefits of the plan include pension in certain cases, payable up to the date of normal superannuation had the employee been in service, to an eligible employee at the time of death or permanent disablement, while in service, either as a result of an injury or as certified by the appropriate authority. The monthly payment to dependents of the deceased/disabled employee under the plan equals 50% of the salary drawn at the time of death or accident or a specified amount, whichever is greater. Tata Motors Limited and these subsidiaries account for the liability for BKY benefits payable in the future based on an actuarial valuation. v) Provident fund and family pension In accordance with Indian law, eligible employees of Tata Motors Limited and some of its subsidiaries and joint operations are entitled to receive benefits in respect of provident fund, a defined contribution plan, in which both employees and the Company make monthly contributions at a specified percentage of the covered employees’ salary (currently 12% of employees’ salary). The contributions, as specified under the law, are made to the provident fund and pension fund set up as an irrevocable trust by Tata Motors Limited and its subsidiaries or to respective Regional Provident Fund Commissioner and the Central Provident Fund under the State Pension scheme. The interest rate payable to the members of the trust shall not be lower than the statutory rate of interest declared by the Central Government under the Employees Provident Funds and Miscellaneous Provisions Act, 1952 and shortfall, if any, shall be made good by the Company. The liability in respect of the shortfall of interest earnings of the Fund is determined on the basis of an actuarial valuation. The interest guarantee is considered to be defined benefit. There is no shortfall as at March 31, 2019. vi) Severance indemnity Tata Daewoo Commercial Vehicle Company Limited, or TDCV, a subsidiary company incorporated in Korea; has an obligation towards severance indemnity, a defined benefit retirement plan, covering eligible employees. The plan provides for a lump sum payment to all employees with more than one year of employment equivalent to 30 days’ salary payable for each completed year of service. vii) Post-retirement medicare scheme Under this unfunded scheme, employees of Tata Motors Limited and some of its subsidiaries receive medical benefits subject to certain limits on amounts of benefits, periods after retirement and types of benefits, depending on their grade and location at the time of retirement. Employees separated from the Company as part of an Early Separation Scheme, on medical grounds or due to permanent disablement are also covered under the scheme. Tata Motors Limited and such subsidiaries account for the liability for post-retirement medical scheme based on an actuarial valuation. viii) Compensated absences Tata Motors Limited and some of its subsidiaries and joint operations provide for the encashment of leave or leave with pay subject to certain rules. The employees are entitled to accumulate leave subject to certain limits, for future encashment. The liability is provided based on the number of days of unutilized leave at each balance sheet date on the basis of an actuarial valuation. ix) Remeasurement gains and losses Remeasurement comprising actuarial gains and losses, the effect of the asset ceiling and the return on assets (excluding interest) relating to retirement benefit plans, are recognized directly in other comprehensive income in the period in which they arise. Remeasurement recorded in other comprehensive income is not reclassified to income statement. Actuarial gains and losses relating to long-term employee benefits are recognized in the income statement in the period in which they arise. x) Measurement date The measurement date of retirement plans is March 31. xi) The Present value of the defined benefit liability and the related current service cost and past service cost are measured using Projected Unit Credit Method.
Dividends	s. Dividends Any dividend declared or paid by Tata Motors Limited for any financial year is based on the profits available for distribution as reported in the unconsolidated statutory financial statements of Tata Motors Limited (Standalone) prepared in accordance with Generally Accepted Accounting Principles in India. Indian law permits the declaration and payment of dividend out of profits for the year or previous financial year(s) as stated in the statutory financial statements of Tata Motors Limited (Standalone) prepared in accordance with Generally Accepted Accounting Principles in India after providing for depreciation in accordance with the provisions of Schedule II to the Companies Act. However, in the absence or inadequacy of the said profits, it may declare dividend out of free reserves, subject to certain conditions as prescribed under the Companies (Declaration and payment of Dividend) Rules, 2014. Accordingly, in certain years the net income reported in these financial statements may not be fully distributable. The amount available for distribution is Rs.Nil as at March 31, 2019.
Segments	Segments The Company primarily operates in the automotive segment. The automotive segment comprises of four reportable segments i.e. Tata Commercial Vehicles, Tata Passenger Vehicles, Jaguar Land Rover and Vehicle Financing. Other operating segments do not meet the quantitative thresholds for disclosure and have been aggregated.
Financial instruments	u. Financial instruments i) Classification, initial recognition and measurement A financial instrument is any contract that gives rise to a financial asset of one entity and a financial liability or equity instrument of another entity. Financial assets other than equity instruments are classified into categories: financial assets at fair value through profit or loss and at amortized cost. Financial assets that are equity instruments are classified as fair value through profit or loss or fair value through other comprehensive income. Financial liabilities are classified into financial liabilities at fair value through profit or loss and other financial liabilities which are carried at amortized cost. Financial instruments are recognized on the balance sheet when the Company becomes a party to the contractual provisions of the instrument. Initially, a financial instrument is recognized at its fair value. Transaction costs directly attributable to the acquisition or issue of financial instruments are recognized in determining the carrying amount, if it is not classified as at fair value through profit or loss. Subsequently, financial instruments are measured according to the category in which they are classified. Financial assets at amortized cost : Financial assets at fair value through other comprehensive income : Dividends from these equity investments are recognized in the statement of Profit or Loss when the right to receive payment has been established. Financial assets at fair value through profit and loss : Derivatives which are not designated as hedging instruments are recognized at fair value through profit or loss. Equity instruments : Financial liabilities at fair value through profit or loss : Financial guarantee contracts : Other financial liabilities : ii) Determination of fair value: The fair value of a financial instrument on initial recognition is normally the transaction price (fair value of the consideration given or received). Subsequent to initial recognition, the Company determines the fair value of financial instruments that are quoted in active markets using the quoted bid prices (financial assets held) or quoted ask prices (financial liabilities held) and using valuation techniques for other instruments. Valuation techniques include discounted cash flow method and other valuation methods. iii) Derecognition of financial assets and financial liabilities: The Company derecognizes a financial asset only when the contractual rights to the cash flows from the asset expires or it transfers the financial asset and substantially all the risk and rewards of ownership of the asset to another entity. If the Company neither transfers nor retains substantially all the risks and rewards of the ownership and continues to control the transferred asset, the Company recognizes its retained interest in the asset and an associated liability for the amounts it may have to pay. If the Company retains substantially all the risks and rewards of ownership of a transferred financial asset, the Company continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received. Financial liabilities are derecognized when these are extinguished, that is when the obligation is discharged, cancelled or has expired. iv) Impairment of financial assets: The Company recognizes a loss allowance for expected credit losses on a financial asset that is at amortized cost. Loss allowance in respect of financial assets is measured at an amount equal to life time expected credit losses and is calculated as the difference between their carrying amount and the present value of the expected future cash flows discounted at the original effective interest rate. Loss allowance in respect of finance receivables is measured at an amount equal to twelve month expected losses if credit risk on such assets has not increased significantly since initial recognition. An allowance equal to lifetime expected losses is provided if credit risk has increased significantly from date of initial recognition. Credit risk is determined to have increased significantly when a finance receivable becomes thirty days past due. Such impairment loss is recognized in the statement of profit and loss. If the amount of impairment loss decreases in a subsequent period, and the decrease can be related objectively to an event occurring after the impairment was recognized, the previously recognized impairment loss is reversed. The reversal is recognized in the income statement.
Hedge accounting	v. Hedge accounting The Company uses foreign currency forward and option contracts to hedge its risks associated with foreign currency fluctuations relating to highly probable forecast transactions. The Company designates these forward and option contracts in a cash flow hedging relationship by applying the hedge accounting principles. These forward and option contracts are stated at fair value at each reporting date. Changes in the fair value of these forward contracts that are designated and effective as hedges of future cash flows are recognized in other comprehensive income and the ineffective portion is recognized in the income statement. Amounts accumulated in equity are reclassified to the statement of Profit or Loss in the periods in which the forecasted transactions occur. Forward premium and basis spread adjustment in forward contract and time value of options that are not designated hedge components are identified as cost of hedge and changes in fair value attributable to these elements are recognized in cost of hedge reserve while changes in fair value determined to be effective portion of the hedge is recognized in hedge reserve. The Company uses interest rate swaps to hedge its risk arising from changes in the market rate of interest. Such interest rate swaps are designated as hedges of interest rate risk arising from changes in cash flow on account of variability in the benchmark rate of interests. Effective portion of fair value changes of such interest rate swaps are recognized in hedge reserve. Ineffective portion, if any, is recognized in the income statement. Hedge accounting is discontinued when hedging instrument expires or is sold, terminated, or exercised, or no longer qualifies for hedge accounting. For forecast transactions, any cumulative gain or loss on the hedging instrument recognized in equity is retained there until the forecast transaction occurs. If the forecast transaction is no longer expected to occur, the net cumulative gain or loss recognized in equity is transferred to the income statement.
Cash and cash equivalents	w. Cash and cash equivalents Cash and cash equivalents are short-term (three months or less from the date of acquisition), highly liquid investments that are readily convertible into cash and which are subject to an insignificant risk of changes in value.
Recent accounting pronouncements adopted by the Company	x. Recent accounting pronouncements adopted by the Company IFRS 9 – Financial Instruments The Company has applied IFRS 9 for period beginning on April 1, 2018. Initial application is made retrospectively subject to certain exemptions and exceptions. Initial application of IFRS 9 lead to the following major changes: Classification IFRS 9 introduces a comprehensive classification model for financial assets that classifies financial assets into three categories: (i) financial assets at amortized cost, (ii) financial assets at fair value through other comprehensive income and (iii) financial assets at fair value through profit or loss. Under IAS 39, financial assets were classified as loans and receivables, available-for-sale Financial assets that contain cash flows other than those of principal and interest are measured at fair value through profit or loss. For equity instruments, IFRS 9 optionally allows measurement at fair value through other comprehensive income. The Company elects to measure certain equity instruments at fair value through other comprehensive income and certain equity instruments at fair value through profit or loss on an instrument by instrument basis. When equity instruments, which are fair value through other comprehensive income are sold or written off, any realized gains and losses on these equity instruments are reclassified to retained earnings and not presented within income statement. Under IAS 39 equity instruments were classified as available for sale and carried at fair value through other comprehensive income. Impairment The new impairment model requires recognition of impairment provision based on expected credit losses rather than only incurred credit losses as under IAS 39. The Company has factored certain future probable events and changes in the current internal factors such as collection efficiency and external macro -economic factors affecting probability of defaults and collections in its impairment model for its finance receivables. There is a decrease in the opening retained earnings of Rs.177.8 million as at April 1, 2018, as a result of factoring future probable events in the provisioning for finance receivables. The Company has adopted simplified approach to provide lifetime expected losses for all trade receivables. There is no change in the provisioning for its trade receivables as a result of adoption of IFRS 9. Hedge accounting Time value of foreign exchange options existing in a hedging relationship at the beginning of the earliest comparative period as at April 1, 2016 or designated thereafter have been retrospectively adjusted in accordance with the transition requirements of IFRS 9 because only the intrinsic value of these options were designated as a hedge instrument in a hedging relationship in accordance with the previously applicable accounting standard IAS 39. The hedging relationships designated prior to and continuing as at the date of initial application met all the qualifying criteria in accordance with IFRS 9. The Company also retrospectively adjusted foreign currency basis spread (forward exchange contracts and cross-currency interest rate swaps), as cost of hedge relating to those hedging relationships that existed at the beginning of the earliest reporting period, April 1, 2016 or were designated thereafter. The new hedge accounting requirement under IFRS 9 aligns more closely with the Company’s risk management practices. The Company has recognized non designated component of changes in the fair value of hedge accounted derivatives, specifically the time value of foreign exchange options and foreign currency basis spread included in foreign exchange forwards, in its cost of hedge reserve . Transition adjustments on adoption of IFRS 9 Adjustments made to line items in the income statements and the statements of comprehensive income and cumulative effect recognized in equity for changes in accounting on adoption of IFRS 9 is as follows: Retained Hedging Cost of Transition adjustment on adoption of IFRS 9 Reason for change (Rs. In millions) Adjustments made to equity Time value of options 2,481.0 — (2,481.0 ) Foreign currency basis spread — 659.5 (659.5 ) Adjustments at March 31, 2016, net of tax 2,481.0 659.5 (3,140.5 ) Changes recognized for year ended March 31, 2017 Foreign exchange gain/(loss) Time value of options (3,305.6 ) — 3,305.6 Gain/(loss) on cash flow hedges (net) Foreign currency basis spread — 7,679.7 (7,679.7 ) Income tax (expense)/credit (net) Tax on time value of options and foreign currency basis spread 634.4 (1,444.4 ) 810.0 Adjustments at March 31, 2017, net of tax (190.2 ) 6,894.8 (6,704.6 ) Changes recognized for year ended March 31, 2018 Foreign exchange gain/(loss) (net) Time value of options (1,574.1 ) — 1,574.1 Gain/(loss) on cash flow hedges (net) Foreign currency basis spread — (1,233.0 ) 1,233.0 Interest (expense) (net) Certain debt issuance cost charged off (426.3 ) — — Income tax (expense)/credit (net) Tax on time value of options and certain debt issuance cost charged off 380.3 195.3 (575.6 ) Adjustments as at March 31 ,2018, net of tax (1,810.3 ) 5,857.1 (4,473.1 ) Basis adjustment for hedges of inventory purchases — (2,819.3 ) 204.8 Expected credit loss (177.8 ) — — Available for sale investments measured now as Fair value through profit or loss 29.3 — — Adjustments as at April 1, 2018, net of tax (1,958.8 ) 3,037.8 (4,268.3 ) The effect of changes on account of adoption of IFRS 9 have also been reflected in notes 19, 28 and 38(c), 38(d)(iv), 39 and 41 The effect on basic net earnings and diluted earnings, on account of above change is immaterial. IFRS 15 – Revenue from Contracts with Customers The standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes earlier revenue recognition guidance, including industry-specific guidance. The core principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration (that is, payment) to which the company expects to be entitled in exchange for those goods or services. The new standard also will result in enhanced disclosures about revenue, provide guidance for transactions that were not previously addressed comprehensively (for example, service revenue and contract modifications) and improve guidance for multiple-element arrangements. The Company has adopted IFRS 15 with a modified retrospective approach. Accordingly, the Company has presented its prior comparative periods without applying the principles of IFRS 15. The cumulative effect of adopting IFRS 15 on prior period retained earnings on adopting IFRS 15 is adjusted in the opening balance of retained earnings as at April 1, 2018. The Company makes transport arrangements for delivering its vehicles to the dealers. The gross consideration received in respect of these arrangements was recognized and presented within revenue in the income statement. The costs associated with these arrangements were earlier presented within freight cost in the income statement. In accordance with IFRS 15, the Company has determined that it is an agent in providing these services, and therefore the gross consideration received, net off cost associated with respect to these arrangements is presented within revenue effective April 1, 2018. Certain payouts made to dealers such as infrastructure support payments are to be treated as variable components of consideration and are therefore in accordance with IFRS 15, recognized as revenue deductions. These changes in presentation in income statement has resulted in decrease in both revenues and expenses by Rs.45,926.9 million for the year ended March 31, 2019. Certain incentives received from Government which were previously presented in revenues, have been included in other income as per IFRS 15. Previously, the Company accounted for all warranty as a cost provision in accordance with IAS 37. Under IFRS 15, the Company has assessed whether the warranty provided, includes a service element (i.e. going beyond simply providing an assurance that the product continues to meet its agreed-upon specification) and accounts for these services as performance obligations associated with the sale of vehicle. The Company now accounts for a proportion of service-type obligations as a contract liability on a stand-alone selling price basis instead of as a warranty provision. This contract liability will be unwound over the period the services are available and provided to the customer. The associated costs are expensed as incurred. The cumulative impact as of March 31, 2018, which resulted in reduction in the retained earnings by Rs. 418.0 million was adjusted in the opening retained earnings on April 1, 2018 with a corresponding reduction in warranty provision (at a cost value) by Rs.1,376.5 million and contract liabilities (at a cost-plus-margin value) by Rs.1,794.5 million.
Recent accounting pronouncements not yet adopted by the Company	Recent accounting pronouncements not yet adopted by the Company New Accounting pronouncements affecting amounts reported and /or disclosures in the financial statements The Company has not applied the following new and revised IFRSs that have been issued but are not yet effective. IFRS 16 Leases 1 Amendments to IFRS 10 & IAS 28 Sale or Contribution of Assets between an Investor and its Associate or Joint Venture 2 Amendments to IAS 40 Investment Property 1 IFRS 17 Insurance Contracts 3 IFRIC 23 Uncertainty over Income Tax Treatments 1 Amendment to IAS 19 Employee Benefits: Remeasurement on a Plan Amendment, Curtailment or Settlement 1 Amendment to IAS 12 Income Taxes 1 Amendment to IAS 28 Investments in Associates and Joint ventures: Long term interests in Associates and Joint ventures 1 1 Effective for annual periods beginning on or after January 1, 2019 2 The IASB has postponed indefinitely the effective date, with early adoption permitted 3 Effective for annual periods beginning on or after January 1, 2021 IFRS 16 – Leases In January 2016, the IASB issued IFRS 16 – Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract and replaces the previous standard on leasing, IAS 17 - Leases. IFRS 16, which is not applicable to service contracts, but only applicable to leases or lease components of a contract, defines a lease as a contract that conveys to the customer (lessee) the right to use an asset for a period of time in exchange for consideration. IFRS 16 eliminates the classification of leases for the lessee as either operating leases or finance leases as required by IAS 17 and instead, introduces a single lessee accounting model whereby a lessee is required to recognize assets and liabilities for all leases with a term that is greater than 12 months, unless the underlying asset is of low value, and to recognize depreciation of leased assets separately from interest on lease liabilities in the income statement. As IFRS 16 substantially carries forward the lessor accounting requirements in IAS 17, a lessor will continue to classify its leases as operating leases or finance leases and to account for those two types of leases differently. The Company will be adopting IFRS 16 with a modified retrospective approach. The cumulative effect of initially applying this Standard will be recorded as an adjustment to the opening balance of retained earnings. The figures for the comparative periods will not be restated. The Company will use the grandfathering clause available for existing leases and apply the available exemptions regarding the recognition of short term leases and low value leasing assets. Basis its assessment, the Company’s arrangements under operating leases, which are currently off balance sheet, will be recorded as right to use assets and the future obligations in respect of such leases will be recorded as a liability in the balance sheet as at April 1, 2019. The Company will use following practical expedients of IFRS 16 at the date of initial application: • With leases previously classified as operating leases according to IAS 17, the lease liability will be measured at the present value of the outstanding lease payments, discounted by the incremental borrowing rate as at April 1, 2019. The respective right-of-use • An impairment review is not performed for right of use assets. Instead, right-of-use • Regardless of their original lease term, leases for which the lease term ends latest on March 31, 2020 are recognized as short-term leases; • At the date of initial application, the measurement of a right-of-use • Hindsight is considered when determining the lease term if the contract contains options to extend or terminate the lease. The Company will recognize in its balance sheet, Rs. 56,536.3 million of right to use assets and Rs. 58,497.7 million of lease liability towards future lease commitments with an adjustment of Rs.1,961.4 million to the opening balance of retained earnings on the adoption date i.e. April 1, 2019. Amendments to IFRS 10 – Consolidated Financial Statements and IAS 28 – Investments in Associates and Joint Ventures: Sale or Contribution of Assets between an Investor and its Associate or Joint Venture In September 2014, IASB issued an amendment to IFRS 10 and IAS 28 to clarify the treatment of the sale or contribution of assets from an investor to its associate or joint venture, as follows: • Requires full recognition in the investor’s financial statements of gains and losses arising on the sale or contribution of assets that constitute a business (as defined in IFRS 3 Business Combinations) • Requires the partial recognition of gains and losses where the assets do not constitute a business, i.e., a gain or loss is recognized only to the extent of the unrelated investors’ interests in that associate or joint venture. • These requirements apply regardless of the legal form of the transaction, for example, whether the sale or contribution of assets occurs by an investor transferring shares in a subsidiary that holds the assets (resulting in loss of control of the subsidiary), or by the direct sale of the assets themselves. The IASB has postponed indefinitely the effective date, with early adoption permitted. Amendments to IFRS 2 – Share-based Payments In June 2016, the IASB issued amendments to IFRS 2 – Share-based Payments that clarify how to account certain share-based payment transactions introducing amendments with respect to: • accounting requirements with respect to the effects of vesting and non-vesting • accounting requirements with respect to share-based payment transactions with a net settlement feature for withholding tax obligations; and • modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. The amendments are effective from January 1, 2018, with early adoption permitted. The Company has assessed and concluded there is no impact arising from adoption of these amendments. IFRS 17 Insurance Contracts In May 2017, IASB issued IFRS 17 which establishes the principles for recognition, measurement, presentation and disclosure of insurance contracts and supersedes IFRS 4 Insurance Contracts. The standard outlines a General Model, which is modified for insurance contracts with direct participation features, described as Variable Fee Approach. The General Model is simplified if certain criteria are met by measuring the liability for remaining coverages using the Premium Allocation Approach. The General Model will use current assumptions to estimate the amounts, timings and uncertainty of future cash flows and it will explicitly measure the cost of that uncertainty. It takes into account market interest rates and impact of policyholders’ options and guarantee. The standard is effective for annual periods beginning on or after January 1, 2021 with early application permitted. It is applied retrospectively unless impracticable, in which case the modified retrospective approach or the fair value approach is applied. The Company is currently assessing the impact of IFRS 17. IAS 12 Income Taxes An entity is required to create a corresponding liability for payment of tax on distribution of dividend when it recognises a liability to pay a dividend. The liability for tax shall be recorded in the income statement, other comprehensive income or equity, as the case may be. The amendment clarifies that income tax consequences of dividends are linked more directly to past transactions or events that generated distributable profits than to distribution to owners. The Company has assessed and concluded that the amendment will not have any significant impact in the Company’s financial statements. IFRIC 23 Uncertainty over Income Tax Treatments In June 2017, IASB issued IFRIC 23 which sets out how to determine the accounting tax position when there is uncertainty over income tax treatments. The Interpretation requires an entity to: • determine whether uncertain tax positions are assessed separately or as a group; and • assess whether it is probable that a tax authority will accept an uncertain tax treatment used, or proposed to be used, by an entity in its income tax filings: If yes, the entity should determine its accounting tax position consistently with the tax treatment used or planned to be used in its income tax filings. If no, the entity should reflect the effect of uncertainty in determining its accounting tax position. IFRIC 23 will be applicable from annual periods beginning from January 1, 2019. The Company does not expect any significant impact on adoption of IFRIC 23. Amendment to IAS 19 Employee Benefits: Change in Employee Benefit Plan When a change to a plan by way of either an amendment, curtailment or settlement takes place, IAS 19 requires a company to remeasure its net defined benefit liability or asset. The amendments to IAS 19 require a company to use the updated assumptions from this remeasurement to determine current service cost and net interest for the remainder of the reporting period after the change to the plan. Until now, IAS 19 did not specify how to determine these expenses for the period after the change to the plan. This amendment will be effective for annual periods beginning from January 1, 2019. The Company does not expect any significant impact on adoption of this amendment. Amendment to IAS 28 Investments in Associates and Joint Ventures: Investments in Associates and Joint ventures: Long term interests in Associates and Joint ventures IFRS 9 excludes interest in associates and joint ventures that are accounted for in accordance with IAS 28, Investments in Associates and Joint Ventures This amendment will be effective for annual periods beginning from January 1, 2019. The Company does not expect any significant impact on adoption of this amendment.
Convenience translation	Convenience translation The consolidated financial statements have been presented in Indian rupees (“Rs.”), Tata Motors Limited’s functional currency. For the convenience of the reader, the financial statements as at and for the year ended March 31, 2019, have been translated into U.S. dollars at US$1.00 = Rs.69.155 based on fixing rate in the City of Mumbai on March 31, 2019, for cable transfers in Indian rupees as published by the Foreign Exchange Dealers’ Association of India (FEDAI). Such translation should not be construed as representation that the rupee amounts have been or could be converted into U.S. dollars at that or any other rate, or at all.

Significant accounting polici_3

Significant accounting policies (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Estimated Useful Lives of Assets	Estimated useful lives of the assets are as follows: Type of Asset Estimated useful life Buildings 20 to 60 years Plant and equipment 3 to 30 years Computers 3 to 6 years Vehicles 3 to 11 years Furniture and fixtures 3 to 21 years
Summary of Estimated Useful Lives of Intangible Assets	Amortization is provided on a straight-line basis over estimated useful lives of the intangible assets as per details below: Type of Asset Estimated Patents and technological know-how 2 to 12 years Customer related intangibles–Dealer network 20 years Intellectual property rights 3 to 10 years Software 1 to 8 years
Summary of Expected Impact on Initial Application of IFRS 9	Adjustments made to line items in the income statements and the statements of comprehensive income and cumulative effect recognized in equity for changes in accounting on adoption of IFRS 9 is as follows: Retained Hedging Cost of Transition adjustment on adoption of IFRS 9 Reason for change (Rs. In millions) Adjustments made to equity Time value of options 2,481.0 — (2,481.0 ) Foreign currency basis spread — 659.5 (659.5 ) Adjustments at March 31, 2016, net of tax 2,481.0 659.5 (3,140.5 ) Changes recognized for year ended March 31, 2017 Foreign exchange gain/(loss) Time value of options (3,305.6 ) — 3,305.6 Gain/(loss) on cash flow hedges (net) Foreign currency basis spread — 7,679.7 (7,679.7 ) Income tax (expense)/credit (net) Tax on time value of options and foreign currency basis spread 634.4 (1,444.4 ) 810.0 Adjustments at March 31, 2017, net of tax (190.2 ) 6,894.8 (6,704.6 ) Changes recognized for year ended March 31, 2018 Foreign exchange gain/(loss) (net) Time value of options (1,574.1 ) — 1,574.1 Gain/(loss) on cash flow hedges (net) Foreign currency basis spread — (1,233.0 ) 1,233.0 Interest (expense) (net) Certain debt issuance cost charged off (426.3 ) — — Income tax (expense)/credit (net) Tax on time value of options and certain debt issuance cost charged off 380.3 195.3 (575.6 ) Adjustments as at March 31 ,2018, net of tax (1,810.3 ) 5,857.1 (4,473.1 ) Basis adjustment for hedges of inventory purchases — (2,819.3 ) 204.8 Expected credit loss (177.8 ) — — Available for sale investments measured now as Fair value through profit or loss 29.3 — — Adjustments as at April 1, 2018, net of tax (1,958.8 ) 3,037.8 (4,268.3 )

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Cash and Cash Equivalents	Cash and cash equivalents consist of the following: As at March 31, 2019 2019 2018 (In millions) Cash balances US$ 4.2 Rs. 292.1 Rs. 314.2 Balances with banks (including deposits with original maturity of up to three months) 3,113.4 215,305.9 146,853.3 Total US$ 3,117.6 Rs.215,598.0 Rs.147,167.5

Finance receivables (Tables)

Finance receivables (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Finance Receivables	Finance receivables consist of vehicle loans, the details of which are as follows: As at March 31, 2019 2019 2018 (In millions) Finance receivables US$ 4,982.7 Rs.344,577.4 Rs.250,707.6 Less: allowance for credit losses 120.5 8,330.5 11,717.9 Total US$ 4,862.2 Rs.336,246.9 Rs.238,989.7 Current portion 1,670.4 115,515.2 84,016.5 Non-current 3,191.8 220,731.7 154,973.2 Total US$ 4,862.2 Rs.336,246.9 Rs.238,989.7

Allowance for trade and other_2

Allowance for trade and other receivables (Tables)	12 Months Ended
	Mar. 31, 2019
Finance receivables [Member]
Statement [line items]
Summary of Changes in Allowance for Credit Losses	Changes in the allowance for credit losses in finance receivables are as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 169.4 Rs.11,717.9 Rs.35,975.1 Rs.44,131.9 Effect of IFRS 9 transition 2.6 177.8 — — Allowances made during the year 46.3 3,202.4 255.2 5,653.5 Written off (97.8 ) (6,767.6 ) (24,512.4 ) (13,810.3 ) Balance at the end US$ 120.5 Rs. 8,330.5 Rs.11,717.9 Rs.35,975.1
Trades and other receivables [Member]
Statement [line items]
Summary of Changes in Allowance for Credit Losses	Change in the allowances for trade and other receivables are as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 213.7 Rs.14,776.2 Rs.15,170.3 Rs.14,460.4 Allowances made during the year 31.0 2,141.9 145.7 1,706.0 Written off (57.5 ) (3,974.4 ) (454.9 ) (1,340.3 ) Currency translation (5.1 ) (353.3 ) 45.6 344.2 Reversal of/(classified as) held for sale 1.9 130.5 (130.5 ) — Balance at the end US$ 184.0 Rs.12,720.9 Rs.14,776.2 Rs.15,170.3

Other Investments - non-curre_2

Other Investments - non-current (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Investments Non current	As at March 31, As at March 31, 2019 2019 2018 (In millions) Available Loans and IAS 39 Category Unquoted Total (a) Investments - measured at Fair value through Other Comprehensive Income Equity shares (quoted) (refer note 1 below) US$ 43.9 Rs. 3,033.9 Rs. 369.5 Rs. — Rs. — Rs. — Rs. 369.5 Equity shares (unquoted) 63.3 4,379.0 — — 2,036.9 1,607.9 3,644.8 Total US$ 107.2 Rs. 7,412.9 Rs. 369.5 Rs. — Rs. 2,036.9 Rs. 1,607.9 Rs. 4,014.3 (b) Investments - measured at Fair value through profit or loss Equity shares (quoted) (refer note 2 below) US$ 61.2 Rs. 4,231.4 Rs. — Rs. — Rs. — Rs. — Rs. — Mutual funds 4.2 288.4 — — — — — Non-cumulative 0.8 54.0 — 4.0 — — 4.0 Cumulative redeemable preference shares 0.4 25.0 — 25.0 — — 25.0 Equity shares (unquoted) 18.0 1,242.8 — — — 2,468.2 2,468.2 Convertible debentures 21.6 1,490.8 — 854.0 — — 854.0 Others 2.8 191.0 — 176.0 — — 176.0 Total US$ 109.0 Rs. 7,523.4 Rs. — Rs. 1,059.0 Rs. — Rs. 2,468.2 Rs. 3,527.2 (c) Investments - measured at amortized cost Non-convertible US$ 0.6 Rs. 38.8 Rs. — Rs. 35.0 Rs. — Rs. — Rs. 35.0 Total US$ 0.6 Rs. 38.8 Rs. — Rs. 35.0 Rs. — Rs. — Rs. 35.0 Total (a+b+c) US$ 216.8 Rs. 14,975.1 Rs. 369.5 Rs. 1,094.0 Rs. 2,036.9 Rs. 4,076.1 Rs. 7,576.5 Note: 1 During the year ended March 31, 2019, the Company reassessed its holdings in Tata Steel Limited classified as held for sale at March 31, 2018 as no longer held for sale due to delays experienced in their disposal. Accordingly, these investments are transferred from current to non-current 2 During the year ended March 31, 2019, the Company’s investments in Lyft Incorporated got listed in NASDAQ stock exchange. The carrying value of these equity shares are Rs.4,231.4 million and Rs.2,047.0 million as at March 31, 2019 and 2018, respectively.

Other Investments - current (Ta

Other Investments - current (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Investments current	As at March 31, As at March 31, 2019 2019 2018 (In millions) IAS 39 Category Available Loans and Unquoted Unquoted Total (a) Investments - measured at Fair value through Other Comprehensive Income Equity Shares (quoted) (refer note 6(1)) US$ 0.1 Rs. 9.2 Rs. 3,035.3 Rs. — Rs. — Rs. — Rs. 3,035.3 Total US$ 0.1 Rs. 9.2 Rs. 3,035.3 Rs. — Rs. — Rs. — Rs. 3,035.3 (b) Investments - measured at Fair value through profit and loss Mutual funds US$ 172.4 Rs. 11,919.0 Rs. 16,007.5 Rs. — Rs. — Rs. — Rs. 16,007.5 Total US$ 172.4 Rs. 11,919.0 Rs. 16,007.5 Rs. — Rs. — Rs. — Rs. 16,007.5 (c) Investments - measured at amortized cost Unquoted: Money market funds US$ 1,120.0 Rs. 77,455.1 Rs. 127,594.7 Rs. — Rs. — Rs. — Rs. 127,594.7 Total US$ 1,120.0 Rs. 77,455.1 Rs. 127,594.7 Rs. — Rs. — Rs. — Rs. 127,594.7 Total (a+b+c) US$ 1,292.5 Rs. 89,383.3 Rs. 146,637.5 Rs. — Rs. — Rs. — Rs. 146,637.5

Other financial assets (Tables)

Other financial assets (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Financial Assets - Current	Other financial assets - current consist of the following: As at March 31, 2019 2019 2018 (In millions) Derivative financial instruments US$ 178.7 Rs. 12,355.4 Rs. 24,761.3 Loans to channel partners 12.8 885.2 188.4 Advances and other receivables recoverable in cash 383.8 26,543.0 24,020.8 Inter corporate deposits 0.3 23.1 3.2 Margin money with banks 21.6 1,495.8 417.1 Government grant receivables 72.3 5,003.1 4,114.0 Restricted bank deposits 52.9 3,652.3 4,938.8 Others 0.2 12.8 — Total US$ 722.6 Rs. 49,970.7 Rs. 58,443.6
Summary of Other Financial Assets - Non-current	Other financial assets - non-current As at March 31, 2019 2019 2018 (In millions) Derivative financial instruments US$ 131.8 Rs. 9,111.4 Rs. 28,469.0 Loans to channel partners 26.1 1,804.9 2,787.2 Advance and other receivables recoverable in cash 140.0 9,682.3 10,728.4 Margin money with banks 47.6 3,290.7 1,048.0 Government grants receivables 73.5 5,080.8 4,671.4 Loans to employees 3.8 262.9 280.6 Restricted deposits 10.9 751.1 690.6 Loans to joint arrangements 0.5 37.5 — Others 30.9 2,144.4 1,917.6 Total US$ 465.1 Rs. 32,166.0 Rs. 50,592.8

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Inventories	Inventories consist of the following: As at March 31, 2019 2019 2018 (In millions) Raw materials, components and consumables US$ 520.9 Rs. 36,026.0 Rs. 45,175.0 Work-in-progress 562.8 38,917.6 40,431.7 Finished goods 4,556.0 315,072.3 338,689.5 Total US$ 5,639.7 Rs. 390,015.9 Rs. 424,296.2

Other current assets (Tables)

Other current assets (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Current Assets	Other current assets consist of the following: As at March 31, 2019 2019 2018 (In millions) Advances to suppliers and contractors US$ 62.8 Rs. 4,340.7 Rs. 3,640.2 Taxes recoverable, statutory deposits and dues from government 733.4 50,719.5 56,749.8 Prepaid expenses 175.1 12,106.8 14,403.5 Others 21.0 1,455.2 1,832.0 Total US$ 992.3 Rs. 68,622.2 Rs. 76,625.5

Other non-current assets (Table

Other non-current assets (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Non-current Assets	Other non-current As at March 31, 2019 2019 2018 (In millions) Taxes recoverable, statutory deposits and dues from government US$ 156.4 Rs. 10,819.0 Rs. 10,496.3 Prepaid rentals on operating leases 52.4 3,625.7 3,817.2 Prepaid expenses 111.1 7,684.2 7,660.0 Others 49.2 3,399.6 2,027.6 Total US$ 369.1 Rs. 25,528.5 Rs. 24,001.1

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Property, Plant and Equipment	Property, plant and equipment consists of the following: Land and Plant and Vehicles Computers Furniture Heritage Total (In millions) Cost as at April 1, 2018 Rs. 196,031.4 Rs. 992,423.7 Rs. 3,841.5 Rs. 21,300.9 Rs. 14,293.8 Rs. 3,546.9 Rs. 1,231,438.2 Additions 68,356.7 162,366.3 1,095.1 5,374.5 2,255.1 243.8 239,691.5 Currency translation (5,218.1 ) (16,339.3 ) (6.4 ) (299.4 ) (199.0 ) (49.2 ) (22,111.4 ) Reversal of assets classified as held for sale 638.9 461.8 38.8 1,568.2 368.9 — 3,076.6 Disposal (426.3 ) (55,547.1 ) (470.4 ) (2,723.8 ) (463.7 ) (13.7 ) (59,645.0 ) Cost as at March 31, 2019 259,382.6 1,083,365.4 4,498.6 25,220.4 16,255.1 3,727.8 1,392,449.9 Accumulated Depreciation as at April 1, 2018 (33,149.1 ) (490,346.0 ) (1,859.2 ) (12,332.2 ) (7,199.3 ) — (544,885.8 ) Depreciation for the year (9,199.8 ) (107,143.4 ) (675.9 ) (2,544.8 ) (1,263.6 ) — (120,827.5 ) Reversal of assets classified as held for sale (260.4 ) (137.3 ) (21.8 ) (1,015.0 ) (167.0 ) — (1,601.5 ) Currency translation 488.1 4,451.2 (0.1 ) 67.9 70.1 — 5,077.2 Write off/impairment of assets — (105,718.0 ) (60.5 ) (2,348.2 ) (1,443.4 ) (1,616.9 ) (111,187.0 ) Disposal 251.2 51,925.2 392.8 2,322.0 390.5 — 55,281.7 Accumulated Depreciation as at March 31, 2019 (41,870.0 ) (646,968.3 ) (2,224.7 ) (15,850.3 ) (9,612.7 ) (1,616.9 ) (718,142.9 ) Net carrying amount as at March 31, 2019 Rs. 217,512.6 Rs. 436,397.1 Rs. 2,273.9 Rs. 9,370.1 Rs. 6,642.4 Rs. 2,110.9 Rs. 674,307.0 Capital work-in-progress 87,996.3 Total Rs. 762,303.3 US$ 11,023.1 Cost as at April 1, 2017 Rs. 146,419.0 Rs. 791,127.5 Rs. 2,989.0 Rs. 19,466.4 Rs. 12,223.1 Rs. 4,233.6 Rs. 976,458.6 Additions 34,576.8 156,105.9 1,340.2 2,708.2 1,464.3 — 196,195.4 Asset acquired in business combination 21.6 2.2 — 131.2 427.3 — 582.3 Assets classified as held for sale (1,273.1 ) (3,675.3 ) (38.8 ) (1,606.9 ) (407.3 ) — (7,001.4 ) Write down of assets — (5,368.2 ) — — — (1,100.6 ) (6,468.8 ) Currency translation 16,380.8 83,892.9 114.6 1,436.4 1,218.2 500.0 103,542.9 Disposal (93.7 ) (29,661.3 ) (563.5 ) (834.4 ) (631.8 ) (86.1 ) (31,870.8 ) Cost as at March 31, 2018 196,031.4 992,423.7 3,841.5 21,300.9 14,293.8 3,546.9 1,231,438.2 Accumulated Depreciation as at April 1, 2017 (24,775.8 ) (388,261.8 ) (1,832.6 ) (11,673.6 ) (6,016.6 ) — (432,560.4 ) Depreciation for the year (6,560.6 ) (97,363.3 ) (483.8 ) (1,869.4 ) (1,343.8 ) — (107,620.9 ) Assets classified as held for sale 340.5 1,160.3 25.8 955.6 133.6 — 2,615.8 Write down of assets — 3,890.8 — — — — 3,890.8 Currency translation (2,181.0 ) (37,328.0 ) (62.1 ) (519.1 ) (543.4 ) — (40,633.6 ) Disposal 27.8 27,556.0 493.5 774.3 570.9 — 29,422.5 Accumulated Depreciation as at March 31, 2018 (33,149.1 ) (490,346.0 ) (1,859.2 ) (12,332.2 ) (7,199.3 ) — (544,885.8 ) Net carrying amount as at March 31, 2018 Rs. 162,882.3 Rs. 502,077.7 Rs. 1,982.3 Rs. 8,968.7 Rs. 7,094.5 Rs. 3,546.9 Rs. 686,552.4 Capital work-in-progress 163,891.7 Total Rs. 850,444.1
Summary of Net Carrying Amounts of Property, Plant and Equipment under Finance Lease Arrangements	1. Net carrying amounts of property, plant and equipment under finance lease arrangements were as follows: As at March 31, 2019 2019 2018 (In millions) Buildings US$ 8.0 Rs. 553.2 Rs. 378.5 Plant and equipment 4.3 298.2 693.2 Computers 0.8 56.0 121.0 Total US$ 13.1 Rs. 907.4 Rs. 1,192.7 2. Land and buildings includes freehold land of Rs. 29,582.7 million and Rs. 30,097.9 million as at March 31, 2019 and 2018, respectively.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Future Minimum Lease Rental Payments under Non-cancellable Operating Leases and Finance Leases	The Company has taken land, buildings, plant and equipment, computers and furniture and fixtures under operating and finance leases. The following is the summary of future minimum lease rental payments under non-cancellable As at March 31, 2019 2018 Operating Finance Operating Finance Minimum Lease Payments Minimum Lease Payments Present value of minimum lease payments Minimum Minimum Present (In millions) Not later than one year Rs. 10,994.1 Rs. 330.0 Rs. 295.9 Rs. 8,808.0 Rs. 253.9 Rs. 222.3 Later than one year but not later than five years 26,261.2 970.9 791.2 21,527.8 282.5 221.9 Later than five years 24,968.3 2,492.5 647.6 23,342.9 380.6 245.6 Total minimum lease commitments Rs. 62,223.6 Rs. 3,793.4 Rs. 1,734.7 Rs. 53,678.7 Rs. 917.0 Rs. 689.8 US$ 899.8 US$ 54.9 US$ 25.1 Less: future finance charges Rs. (2,058.7 ) Rs. (227.2 ) Present value of minimum lease payments Rs. 1,734.7 Rs. 689.8 Included in the financial statements as: Other financial liabilities — current (refer note 22) Rs. 173.0 Rs. 222.3 Other financial liabilities — non-current 1,561.7 467.5 Rs. 1,734.7 Rs. 689.8 US$ 25.1

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Goodwill	As at March 31, 2019 2019 2018 (In millions) Balance at the beginning US$ 16.8 Rs. 1,164.5 Rs. 6,733.2 Impairment (1.2 ) (81.1 ) Reversal of/(classified as) held for sale 92.6 6,399.2 (5,579.1 ) Currency translation (0.1 ) (3.9 ) 10.4 Balance at the end US$ 108.1 Rs. 7,478.7 Rs. 1,164.5

Intangible assets (Tables)

Intangible assets (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Intangible Assets	Intangible assets consist of the following: Software Patents and Customer Intellectual Product Indefinite life trademarks Total (In millions) Cost as at April 1, 2018 Rs. 63,015.3 Rs. 15,221.2 Rs. 5,612.7 Rs. 3,268.3 Rs. 681,420.6 Rs. 57,063.1 Rs. 825,601.2 Additions 8,446.9 21.8 — 445.9 114,174.4 — 123,089.0 Reversal of assets classified as held for sale 2,488.3 17.5 486.9 — — — 2,992.7 Currency translation (1,923.6 ) (283.5 ) (119.6 ) (84.5 ) (12,321.8 ) (1,097.0 ) (15,830.0 ) Fully amortized not in use (4,345.1 ) (382.0 ) — (82.8 ) (85,732.2 ) — (90,542.1 ) Cost as at March 31, 2019 67,681.8 14,595.0 5,980.0 3,546.9 697,541.0 55,966.1 845,310.8 Accumulated amortization at April 1, 2018 (32,351.4 ) (13,956.4 ) (2,731.2 ) (882.3 ) (317,707.6 ) — (367,628.9 ) Amortization for the year (10,434.8 ) (768.3 ) (293.5 ) (395.7 ) (97,478.0 ) — (109,370.3 ) Reversal of assets classified as held for sale (1,706.3 ) (4.8 ) (110.0 ) — — — (1,821.1 ) Write down/impairment of assets (6,694.0 ) — (617.3 ) (474.0 ) (80,928.6 ) (13,168.8 ) (101,882.7 ) Currency translation 540.6 375.4 52.3 (95.9 ) 4,961.1 (141.1 ) 5,692.4 Fully amortized not in use 4,345.1 382.0 — 82.8 85,732.2 — 90,542.1 Accumulated amortization at March 31, 2019 (46,300.8 ) (13,972.1 ) (3,699.7 ) (1,765.1 ) (405,420.9 ) (13,309.9 ) (484,468.5 ) Net carrying amount as at March 31, 2019 Rs. 21,381.0 Rs. 622.9 Rs. 2,280.3 Rs. 1,781.8 Rs. 292,120.1 Rs. 42,656.2 Rs. 360,842.3 Capital work-in-progress 219,713.6 Total Rs. 580,555.9 US$ 8,395.0 Cost as at April 1, 2017 Rs. 52,128.4 Rs. 13,136.9 Rs. 5,166.0 Rs. 1,950.0 Rs. 468,329.6 Rs. 50,035.0 Rs. 590,745.9 Additions 8,472.0 427.5 223.1 615.3 155,417.4 — 165,155.3 Asset acquired in Business Combination 126.2 — — 335.9 — — 462.1 Assets classified as held for sale (2,488.3 ) (16.8 ) (486.9 ) — — — (2,992.0 ) Currency translation 6,943.2 1,673.6 710.5 367.1 69,602.0 7,028.1 86,324.5 Fully amortized not in use (2,166.2 ) — — — (11,928.4 ) — (14,094.6 ) Cost as at March 31, 2018 63,015.3 15,221.2 5,612.7 3,268.3 681,420.6 57,063.1 825,601.2 Accumulated amortization at April 1, 2017 (22,148.2 ) (10,960.5 ) (2,254.4 ) (396.2 ) (207,832.3 ) — (243,591.6 ) Amortization for the year (9,972.6 ) (1,350.7 ) (260.9 ) (536.7 ) (90,076.4 ) — (102,197.3 ) Assets Held for Sale 1,700.5 6.4 109.6 — — — 1,816.5 Write down of assets (1,127.1 ) — — — — — (1,127.1 ) Currency translation (2,970.2 ) (1,651.6 ) (325.5 ) 50.6 (31,727.3 ) — (36,624.0 ) Fully amortized not in use 2,166.2 — — — 11,928.4 — 14,094.6 Accumulated amortization at March 31, 2018 (32,351.4 ) (13,956.4 ) (2,731.2 ) (882.3 ) (317,707.6 ) — (367,628.9 ) Net carrying amount as at March 31, 2018 Rs. 30,663.9 Rs. 1,264.8 Rs. 2,881.5 Rs. 2,386.0 Rs. 363,713.0 Rs. 57,063.1 Rs. 457,972.3 Capital work-in-progress 227,195.6 Total Rs. 685,167.9 1. The useful life of trademarks and brands in respect of the acquired Jaguar Land Rover businesses have been determined to be indefinite as the Company expects to generate future economic benefits indefinitely from these assets. The indefinite life intangible assets have been allocated to the Jaguar Land Rover businesses. The recoverable amount of the cash generating unit has been determined based on value in use. Value in use has been determined based on future cash flows after considering current economic conditions and trends, estimated future operating results, growth rates and anticipated future economic conditions. 2. During the year ended March 31, 2014, legislation was enacted that allows United Kingdom (UK) companies to elect for the Research and Development Expenditure Credit (RDEC) on qualifying expenditures incurred since April 1, 2013, instead of the existing super-deduction rules. As a result of this election by the Company’s subsidiary in the UK, Rs. 8,350.6 million, Rs. 8,717.5 million and Rs. 7,626.7 million of the RDEC, for the years ended March 31, 2019, 2018 and 2017, respectively, the proportion relating to capitalized product development expenditure, have been offset against these assets. The remaining Rs. 1,601.5 million, Rs. 3,845.9 million and Rs.3,331.1 million for the years ended March 31, 2019, 2018 and 2017 respectively, have been recognized as incentives, a component of other income/(loss) (net).
Summary of Intangible Assets Under Development	Intangible assets under development Year ended March 31, 2019 2018 Cost as at April 1, US$ 3,285.3 Rs. 227,195.6 Rs. 224,359.5 Additions 2,511.7 173,698.8 161,196.8 Transferred to other intangible assets (1,773.1 ) (122,621.4 ) (164,960.7 ) Transferred to Held for Sale — — (1,901.0 ) Reversal of assets classified as Held for Sale 1.8 125.4 — Provision for impairment/Write off (778.9 ) (53,864.8 ) (15,766.4 ) Currency translation (69.7 ) (4,820.0 ) 24,267.4 Balance at the end US$ 3,177.1 Rs. 219,713.6 Rs. 227,195.6

Impairment of Jaguar Land Rov_2

Impairment of Jaguar Land Rover Business (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Impairment of Jaguar Land Rover Business	The approach and key (unobservable) assumptions used to determine the CGU’s VIU were as follows: As at March 31, 2019 2018 Growth rate applied beyond approved forecast period 1.9 % 2.0 % Pre-tax 11.8 % 8.7 % The resulting impairment allocation is as follows: As at March 31, (in millions) Property, plant and equipment 108,570.1 Capital work-in-progress 16,560.8 Goodwill 81.1 Other intangible assets 101,873.4 Intangible assets under development 51,293.7 Total 278,379.1 Sensitivity to key assumptions The change in the following table to assumptions used in the impairment review would, in isolation, lead to an increase to the aggregate impairment loss recognized as at March 31, 2019 (although it should be noted that these sensitivities do not take account of potential mitigating actions): As at March 31, In millions Increase in discount rate by 1% 100,828.7 Decrease in long-term growth rate applied beyond approved forecast period by 0.5% 43,716.6 Decrease in projected volume by 5% 388,923.7 Decrease in projected gross margin by 1% 188,986.0

Investments in equity account_2

Investments in equity accounted investees (Tables)	12 Months Ended
	Mar. 31, 2019
Statement [line items]
Summary of Investments in Equity Accounted Investees	(c) Summary of carrying amount of the Company’s interest in equity accounted investees: As at March 31, 2019 2019 2018 (In millions) Carrying amount in immaterial associates US$ 150.3 Rs. 10,393.4 Rs. 4,359.9 Carrying amount in immaterial associates (held for sale)# — — 4,973.5 Carrying amount in material joint venture 621.1 42,955.4 44,494.0 Carrying amount in immaterial joint ventures — — 25.0 Total US$ 771.4 Rs. 53,348.8 Rs. 53,852.4 Current (held for sale)# US$ — Rs. — Rs. 4,973.5 Non current 771.4 53,348.8 48,878.9 Total US$ 771.4 Rs. 53,348.8 Rs. 53,852.4 # Carrying amount of investments in Tata Hitachi Construction Machinery Co. Pvt Ltd. Subsequent to the year ended March 31, 2019, the Company reassessed its holdings in Tata Hitachi Construction Machinery Co. Pvt Ltd. classified as held for sale at March 31, 2018 as no longer held for sale due to delays experienced in the disposal. Accordingly, the investments are transferred from current to non-current investments. (d) Summary of Company’s share of profit/(loss) in equity accounted investees: Year ended March 31, 2019 2019 2018 2017 (In millions) Share of profit/(loss) in immaterial associates US$ 16.1 Rs. 1,110.6 Rs. 1,183.0 Rs. 1,109.3 Share of profit/(loss) in material joint venture 8.1 559.8 21,690.7 13,660.3 Share of profit/(loss) on other adjustments in material joint venture 6.5 449.6 (253.6 ) (116.1 ) Share of profit/(loss) in immaterial joint ventures (0.4 ) (25.0 ) 162.5 276.5 US$ 30.3 Rs. 2,095.0 Rs. 22,782.6 Rs. 14,930.0 (e) Summary of Company’s share of other comprehensive income in equity accounted investees: Year ended March 31, 2019 2019 2018 2017 (In millions) Share of other comprehensive income in immaterial associates US$ 1.6 Rs. 111.5 Rs. (113.8 ) Rs. (40.0 ) Currency translation - immaterial associates (0.4 ) (28.3 ) 94.8 (115.1 ) Currency translation -material joint venture (8.1 ) (557.8 ) 4,015.7 (2,801.6 ) Currency translation -immaterial joint ventures — — — (130.3 ) US$ (6.9 ) Rs. (474.6 ) Rs. 3,996.7 Rs. (3,087.0 )
Immaterial associates [Member]
Statement [line items]
Summary of Financial Information of Immaterial Associates Accounted for using the Equity Method	The Company has no material associates as at March 31, 2019. The aggregate summarized financial information in respect of the Company’s immaterial associates that are accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Carrying amount of the Company’s interest in associates US$ 150.3 Rs. 10,393.4 Rs. 9,333.4 Year ended March 31, 2019 2019 2018 2017 (In millions) Company’s share of profit/(loss) in associates * US$ 16.1 Rs. 1,110.6 Rs. 1,183.0 Rs. 1,109.3 Company’s share of other comprehensive income in associates 1.2 83.2 (19.0 ) (155.1 ) Company’s share of total comprehensive income in associates US$ 17.3 Rs. 1,193.8 Rs. 1,164.0 Rs. 954.2
Chery Jaguar Land Rover Automotive Co. Limited [member]
Statement [line items]
Summary of Joint Venture	Details of the Company’s material joint venture as at March 31, 2019 are as follows: Principal activity Principal % holding Name of joint venture 2019 2018 Chery Jaguar Land Rover Automotive Co. Limited (Chery) Manufacture and China 50 % 50 % The summarized financial information in respect of Chery that is accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Current assets US$ 979.0 Rs. 67,701.9 Rs. 82,317.9 Non-current 1,883.4 130,244.7 122,184.9 Current liabilities (1,444.9 ) (99,923.6 ) (99,298.3 ) Non-current (159.7 ) (11,042.4 ) (14,184.1 ) The above amounts of assets and liabilities include the following: Cash and cash equivalents 413.6 28,601.3 40,466.8 Current financial liabilities (excluding trade and other payables and provisions) (363.8 ) (25,161.9 ) (3,885.2 ) Non-current (159.7 ) (11,042.3 ) (13,999.6 ) Share of net assets of material joint venture 628.9 43,490.3 45,510.2 Other consolidation adjustments (7.8 ) (534.9 ) (1,016.2 ) Carrying amount of the Company’s interest in joint venture US$ 621.1 Rs. 42,955.4 Rs. 44,494.0 Year ended March 31, 2019 2019 2018 2017 (In millions) Revenue US$ 2,251.7 Rs. 155,715.0 Rs. 237,876.1 Rs. 189,601.3 Net income/(loss) 16.2 1,119.5 43,381.3 27,320.6 Other comprehensive income — — — — Total comprehensive income for the year 16.2 1,119.5 43,381.3 27,320.6 The above net income includes the following: Depreciation and amortization 272.7 18,857.6 11,947.8 9,201.1 Interest income (15.8 ) (1,092.0 ) (2,298.7 ) (993.2 ) Interest expense (net) 18.3 1,266.3 609.0 706.6 Income tax expense/(credit) US$ 8.4 Rs. 578.1 Rs. 11,630.5 Rs. 9,014.4
Summary of Reconciliation of Financial Information to Carrying Amount of Interest in Joint Venture	Reconciliation of above summarized financial information to the carrying amount of the interest in the joint venture recognized in the consolidated financial statements: As at March 31, 2019 2019 2018 (In millions) Net assets of the joint venture US$ 1,257.8 Rs. 86,980.6 Rs. 91,020.4 Proportion of the Company’s interest in joint venture 628.9 43,490.3 45,510.2 Other consolidation adjustments (7.8 ) (534.9 ) (1,016.2 ) Carrying amount of the Company’s interest in joint venture US$ 621.1 Rs. 42,955.4 Rs. 44,494.0
Immaterial joint ventures [Member]
Statement [line items]
Summary of Joint Venture	The aggregate summarized financial information in respect of the Company’s immaterial joint ventures that are accounted for using the equity method is set forth below. As at March 31, 2019 2019 2018 (In millions) Carrying amount of the Company’s interest in joint ventures US$ — Rs. — Rs. 25.0 Year ended March 31, 2019 2019 2018 2017 (In millions) Company’s share of profit/(loss) in immaterial joint ventures* US$ (0.4 ) Rs. (25.0 ) Rs. 162.5 Rs. 276.5 Company’s share of other comprehensive income in immaterial joint ventures — — — (130.3 ) Company’s share of total comprehensive income in immaterial joint ventures US$ (0.4 ) Rs. (25.0 ) Rs. 162.5 Rs. 146.2

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Domestic and Foreign Components of Net Income Before Income Tax	The domestic and foreign components of net income before income tax: Year ended March 31, 2019 2019 2018 2017 (In millions) Net income/(loss) before income taxes India US$ 396.6 Rs. 27,429.8 Rs. (8,867.9 ) Rs. (46,507.6 ) Other than India (4,988.4 ) (344,982.9 ) 112,608.0 141,106.4 Total US$ (4,591.8 ) Rs. (317,553.1 ) Rs. 103,740.1 Rs. 94,598.8
Summary of Domestic and Foreign Components of Income Tax Expense	The domestic and foreign components of income tax expense: Year ended March 31, 2019 2019 2018 2017 (In millions) Current taxes India US$ 72.8 Rs. 5,034.3 Rs. 2,420.0 Rs. 1,842.8 Other than India 249.0 17,217.9 30,608.5 29,531.1 Deferred taxes India (46.9 ) (3,241.9 ) 494.6 3,111.6 Other than India (642.6 ) (44,435.3 ) 4,155.1 550.1 Total income tax expense/(credit) US$ (367.7 ) Rs. (25,425.0 ) Rs. 37,678.2 Rs. 35,035.6
Summary of Reconciliation of Estimated Income Tax to Income Tax Expense	The reconciliation of estimated income tax to income tax expense/(credit) reported in the income statement is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Income/(loss) before income taxes US$ (4,591.8 ) Rs. (317,553.1 ) Rs. 103,740.1 Rs. 94,598.8 Income tax expense at tax rates applicable to individual entities (791.2 ) (54,712.2 ) 20,746.7 13,625.8 Additional deduction for patent, research and product development cost (27.3 ) (1,891.2 ) (4,099.8 ) (7,455.8 ) Items (net) not deductible for tax /not liable to tax : - foreign currency (gain)/loss relating to loans and deposits (net) (1.2 ) (82.8 ) 1,336.2 (739.8 ) - interest, loss on conversion option and other expenses relating to borrowings for investment 9.0 621.6 337.8 531.0 - Dividend from subsidiaries, joint operations, equity accounted investees and available-for-sale (0.2 ) (15.5 ) (50.1 ) 27.1 Undistributed earnings of subsidiaries, joint operations and equity accounted investees 18.5 1,277.8 9,170.1 4,134.3 Deferred tax assets not recognized because realization is not probable 68.5 4,738.7 9,902.3 29,372.1 Utilization/credit of unrecognized tax losses, unabsorbed depreciation and other tax benefits (101.5 ) (7,016.4 ) (3,583.3 ) (2,950.5 ) Previously recognized deferred tax assets written down on account of provision for impairment in Jaguar Land Rover 390.2 26,981.5 — — Profit on sale of business by a subsidiary to another subsidiary — — — 4,078.9 Profit on sale of investments in subsidiaries and Others (13.5 ) (932.0 ) — — Tax on share of (profit)/loss of equity accounted investees (net) (7.7 ) (532.7 ) (4,601.4 ) (3,146.7 ) Impact of change in statutory tax rates (refer note below) 65.7 4,540.4 5,392.6 (5,684.6 ) Others 23.0 1,597.8 3,127.1 3,243.8 Income tax expense/(credit) reported US$ (367.7 ) Rs. (25,425.0 ) Rs. 37,678.2 Rs. 35,035.6
Summary of Significant Components of Deferred Tax Assets and Liabilities	Significant components of deferred tax assets and liabilities for the year ended March 31, 2019 are as follows: Opening balance Adjustment of IFRS 15 Adjusted Balance Recognized in Recognized in/reclassified MAT Credit Reversal of classified as in earlier year Divestment of a Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 21,955.1 Rs. Rs. 21,955.1 Rs. (161.20 ) Rs. (0.1 ) Rs. — Rs. 24.3 Rs. 124.4 Rs. 21,942.5 Business loss carry forwards 42,737.4 84.5 42,821.9 (19,255.9 ) (723.9 ) — — — 22,842.1 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 30,213.9 — 30,213.9 3,911.1 2.2 — 21.2 24.5 34,172.9 Compensated absences and retirement benefits 8,426.3 — 8,426.3 32.7 3,858.5 — 132.4 13.0 12,462.9 Minimum alternate tax carry-forward 381.9 — 381.9 817.8 (15.8 ) 37.8 (155.5 ) 1,066.2 Property, plant and equipment 926.5 — 926.5 48,258.9 108.2 — — — 49,293.6 Derivative financial instruments 7,552.4 — 7,552.4 1,022.1 3,674.7 — 3.9 — 12,253.1 Unrealized profit on inventory 15,079.2 — 15,079.2 (3,811.5 ) 151.0 — — — 11,418.7 Others 10,927.9 — 10,927.9 1,687.1 (49.7 ) — 15.2 8.2 12,588.7 Total deferred tax assets Rs. 138,200.6 Rs. 84.5 Rs. 138,285.1 Rs. 32,501.1 Rs. 7,020.9 Rs. (15.8 ) Rs. 234.8 Rs. 14.6 Rs. 178,040.7 Deferred tax liabilities: Property, plant and equipment 16,852.0 — 16,852.00 (1,142.6 ) (119.7 ) — 56.0 72.1 15,717.8 Intangible assets 121,838.5 — 121,838.50 (12,420.5 ) (1,881.1 ) — (27.4 ) — 107,509.5 Undistributed earnings in subsidiaries, joint operations and equity accounted investees 19,397.2 — 19,397.20 (2,330.4 ) * (174.6 ) — — — 16,892.2 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — 169.50 — — — — — 169.5 Others 136.6 — 136.60 717.4 176.1 — 120.9 — 1,151.0 Total deferred tax liabilities Rs. 158,393.8 Rs. — Rs. 158,393.8 Rs. (15,176.1 ) Rs. (1,999.3 ) Rs. — Rs. 149.5 Rs. 72.1 Rs. 141,440.0 Net assets/(liabilities) Rs. (20,193.2 ) Rs. 84.5 Rs. (20,108.7 ) Rs. 47,677.2 Rs. 9,020.2 Rs. (15.8 ) Rs. 85.3 Rs. (57.5 ) Rs. 36,600.7 US$ (292.0 ) US$ 1.2 US$ (290.8 ) US$ 689.5 US$ 130.4 US$ (0.2 ) US$ 1.2 US$ (0.8 ) US$ 529.3 Deferred tax assets Rs. 51,511.1 Deferred tax liabilities Rs. (14,910.4 ) Deferred tax assets US$ 744.9 Deferred tax liabilities US$ (215.6 ) * Net of Rs. 3,608.2 million reversed on dividend distribution by subsidiaries. Significant components of deferred tax assets and liabilities for the year ended March 31, 2018 are as follows: Opening Recognized in profit or loss Recognized in /reclassified Classified as Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 19,921.0 Rs. 2,150.3 Rs. 15.8 Rs. (132.1 ) Rs. 21,955.1 Business loss carry forwards 27,509.3 11,944.0 3,284.1 — 42,737.4 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 26,824.2 2,191.5 1,233.1 (34.9 ) 30,213.9 Compensated absences and retirement benefits 21,729.6 (7,224.7 ) (5,941.6 ) (137.0 ) 8,426.3 Minimum alternate tax carry-forward 749.2 (329.5 ) — (37.8 ) 381.9 Property, plant and equipment 1,119.0 (308.3 ) 115.8 — 926.5 Derivative financial instruments 44,289.4 (465.4 ) (36,267.6 ) (3.9 ) 7,552.4 Unrealized profit on inventory 15,696.4 (3,038.2 ) 2,421.0 — 15,079.2 Others 7,985.3 2,346.5 689.5 (93.4 ) 10,927.9 Total deferred tax assets Rs. 165,823.4 Rs. 7,266.2 Rs. (34,449.9 ) (439.1 ) Rs. 138,200.6 Deferred tax liabilities: Property, plant and equipment 14,335.3 2,221.9 453.5 (158.7 ) 16,852.0 Intangible assets 104,848.9 5,305.1 11,657.1 27.4 121,838.5 Undistributed earnings of subsidiaries joint operations and equity accounted investees 13,376.3 5,081.6 * 939.3 — 19,397.2 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — — — 169.5 Derivative financial instruments 231.2 (611.5 ) 380.3 — — Others 446.9 (81.2 ) (132.9 ) (96.2 ) 136.6 Total deferred tax liabilities Rs. 133,408.1 Rs. 11,915.9 Rs. 13,297.3 (227.5 ) Rs. 158,393.8 Net assets/(liabilities) Rs. 32,415.3 Rs. (4,649.7 ) Rs. (47,747.2 ) (211.6 ) Rs. (20,193.2 ) Deferred tax assets Rs. 41,064.6 Deferred tax liabilities Rs. (61,257.8 ) * Net of Rs. 4,088.5 million reversed on dividend distribution by subsidiaries. Significant components of deferred tax assets and liabilities for the year ended March 31, 2017 are as follows: Opening Recognized in Recognized in /reclassified Closing balance (In millions) Deferred tax assets: Unabsorbed depreciation Rs. 19,432.6 Rs. 489.0 Rs. (0.6 ) Rs. 19,921.0 Business loss carry forwards 34,321.9 (4,177.0 ) (2,635.6 ) 27,509.3 Expenses deductible in future years: - provisions, allowances for doubtful receivables and others 33,149.5 (5,127.0 ) (1,198.3 ) 26,824.2 Compensated absences and retirement benefits 11,859.0 (6.2 ) 9,876.8 21,729.6 Minimum alternate tax carry-forward 582.6 166.6 — 749.2 Property, plant and equipment 2,109.3 (738.1 ) (252.2 ) 1,119.0 Derivative financial instruments 22,966.4 (1,283.3 ) 22,606.3 44,289.4 Unrealized profit on inventory 12,233.4 5,519.4 (2,056.4 ) 15,696.4 Others 5,745.0 3,044.4 (804.1 ) 7,985.3 Total deferred tax assets Rs. 142,399.7 Rs. (2,112.2 ) Rs. 25,535.9 Rs. 165,823.4 Deferred tax liabilities: Property, plant and equipment 16,117.2 (1,787.8 ) 5.9 14,335.3 Intangible assets 115,877.7 2,879.2 (13,908.0 ) 104,848.9 Undistributed earnings in subsidiaries, joint operations and equity accounted investees 13,436.3 480.7 * (540.7 ) 13,376.3 Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest 169.5 — — 169.5 Derivative financial instruments 40.4 200.2 (9.4 ) 231.2 Others 624.1 (222.8 ) 45.6 446.9 Total deferred tax liabilities Rs. 146,265.2 Rs. 1,549.5 Rs. (14,406.6 ) Rs. 133,408.1 Net assets/(liabilities) Rs. (3,865.5 ) Rs. (3,661.7 ) Rs. 39,942.5 Rs. 32,415.3 Deferred tax assets Rs. 44,221.7 Deferred tax liabilities Rs. (11,806.4 ) * Net of Rs. 3,653.6 million reversed on dividend distribution by subsidiaries.
Summary of Unrecognized Deferred Tax Assets Expire Unutilized based on Year of Origination	Unrecognized deferred tax assets expire unutilized based on the year of origination as follows: March 31, In millions 2020 US$ 7.6 Rs. 525.0 2021 57.8 3,995.5 2022 59.9 4,142.4 2023 128.1 8,859.5 2024 103.6 7,161.4 Thereafter US$ 553.0 Rs. 38,244.6 Total US$ 910.0 Rs. 62,928.4

Debt (Tables)

Debt (Tables)	12 Months Ended
	Mar. 31, 2019
Short-term borrowings and current portion of long-term debt [Member]
Statement [line items]
Summary of Debt	Short-term borrowings and current portion of long-term debt consist of the following: As at March 31, 2019 2019 2018 (In millions) Commercial paper US$ 1,583.8 Rs. 109,525.6 Rs. 105,815.5 Loans from banks/financial institutions 1,319.5 91,247.0 61,273.0 Inter-corporate deposits 10.5 730.0 860.0 Current portion of long-term debt (refer note 21) 2,174.0 150,341.1 109,338.9 Total US$ 5,087.8 Rs. 351,843.7 Rs. 277,287.4
Long-term debt [Member]
Statement [line items]
Summary of Debt	Long-term debt consists of the following: As at March 31, 2019 2019 2018 (In millions) Non-convertible US$ 1,847.9 Rs. 127,793.8 Rs. 148,107.9 Collateralized debt obligations 440.7 30,473.3 13,205.8 Buyers credit from banks at floating interest rate 361.5 25,000.0 15,000.0 Loan from banks/financial institutions 4,039.8 279,380.1 137,181.5 Senior notes 5,536.1 382,845.6 396,301.9 Others 186.8 12,915.3 10,961.2 Total 12,412.8 858,408.1 720,758.3 Less: current portion (refer note 20) 2,174.0 150,341.1 109,338.9 Long-term debt US$ 10,238.8 Rs. 708,067.0 Rs. 611,419.4
Long-term debt [Member] | Luxembourg Stock Exchange [Member]
Statement [line items]
Summary of Debt	Details of the tranches of the senior notes outstanding at March 31, 2019 are as follows: Issued on Currency Initial (in millions) Outstanding (in millions) Outstanding (In millions) Interest Redeemable on As at March 31, 2019 2018 January 2013 USD 500 500 Rs. 34,464.0 Rs. 32,485.2 5.625 % February 2023 February 2015 GBP 400 400 36,005.8 36,664.8 3.875 % March 2023 January 2014 GBP 400 400 35,969.8 36,598.4 5.000 % February 2022 March 2015 USD 500 500 34,686.5 32,713.6 3.500 % March 2020 December 2013 USD 700 — — 45,844.7 4.125 % December 2018 October 2014 USD 500 500 34,713.0 32,738.4 4.250 % November 2019 January 2017 GBP 300 300 27,036.8 27,504.6 2.750 % January 2021 January 2017 EUR 650 650 50,367.0 52,112.4 2.200 % January 2024 October 2017 USD 500 500 34,585.5 31,569.2 4.500 % March 2027 October 2018 USD 500 500 38,989.5 — 4.500 % January 2026 Total Rs. 326,817.9 Rs. 328,231.3
Long-term debt [Member] | Singapore Stock Exchange [Member]
Statement [line items]
Summary of Debt	Details of the tranches of the senior notes outstanding at March 31, 2019 are as follows: Issued on Currency Initial (in millions) Outstanding (in millions) Outstanding (In millions) Interest Redeemable on As at March 31, 2019 2018 October 2014 USD 250 250 Rs. 17,187.3 Rs. 16,194.3 5.750 % October 2024 May 2014 USD 300 300 20,791.6 19,487.7 5.750 % May 2021 October 2014 USD 500 262.532 18,048.8 32,388.6 4.625 % April 2020 Total Rs. 56,027.7 Rs. 68,070.6

Other financial liabilities (Ta

Other financial liabilities (Tables)	12 Months Ended
	Mar. 31, 2019
Other financial liabilities - current [Member]
Statement [line items]
Summary of Other Financial Liabilities	Other current financial liabilities consist of the following: As at March 31, 2019 2019 2018 (In millions) Liability towards vehicles sold under repurchase arrangements US$ 613.6 Rs. 42,436.5 Rs. 44,235.8 Interest accrued but not due 153.2 10,595.8 10,957.2 Lease liabilities 2.5 173.0 222.3 Derivative financial instruments 685.8 47,425.3 62,076.6 Unclaimed matured fixed deposits 1.1 73.4 107.7 Others 42.9 2,965.2 1,519.0 Total US$ 1,499.1 Rs. 103,669.2 Rs. 119,118.6
Other financial liabilities - non-current [Member]
Statement [line items]
Summary of Other Financial Liabilities	Other financial liabilities non-current As at March 31, 2019 2019 2018 (In millions) Lease liabilities US$ 22.6 Rs. 1,561.7 Rs. 467.5 Derivative financial instruments 385.0 26,624.4 24,502.0 Liability towards employee separation scheme 11.4 791.0 852.2 Retention money, security deposits and others 7.4 511.7 2,065.7 Total US$ 426.4 Rs. 29,488.8 Rs. 27,887.4

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Provisions	Provisions consist of the following: As at March 31, 2019 2019 2018 (In millions) Current Product warranty US$ 1,070.7 Rs. 74,042.5 Rs. 64,815.0 Legal and product liability 201.7 13,951.2 10,999.2 Provision for residual risk 12.3 851.2 622.0 Provision for environmental liability 18.1 1,254.7 978.8 Employee related and other provisions 171.7 11,867.9 * 2,003.5 Total-Current US$ 1,474.5 Rs. 101,967.5 Rs. 79,418.5 Non-current Product warranty US$ 1,460.1 Rs. 100,970.1 Rs. 94,521.6 Legal and product liability 56.6 3,913.1 2,199.5 Provision for residual risk 40.1 2,776.2 2,547.6 Provision for environmental liability 20.0 1,381.2 1,500.5 Employee benefits obligations 119.5 8,263.5 7,380.0 Other provisions 17.9 1,244.4 1,344.1 Total-Non-current US$ 1,714.2 Rs. 118,548.5 Rs. 109,493.3 *  Includes employee separation cost provision.    Year ended March 31, 2019 2019 2019 2019 Product Warranty Legal and product Liability (In millions) Balance at the beginning US$ 2,304.1 Rs. 159,336.6 US$ 190.9 Rs. 13,198.7 Adjustment on initial application of IFRS 15 (refer note 2(x)) (19.9 ) (1,376.5 ) — — Provision made during the year 1,507.3 104,237.0 * 211.9 14,654.8 Provision used during the year (1,244.9 ) (86,087.7 ) (142.5 ) (9,857.3 ) Impact of discounting 27.7 1,912.5 — — Currency translation (43.5 ) (3,009.3 ) (2.0 ) (131.9 ) Balance at the end US$ 2,530.8 Rs. 175,012.6 US$ 258.3 Rs. 17,864.3 Current US$ 1,070.7 Rs. 74,042.5 US$ 201.7 Rs. 13,951.2 Non-current US$ 1,460.1 Rs. 100,970.1 US$ 56.6 Rs. 3,913.1 *  Provision includes estimated recovery from suppliers Rs. (29.6) million.    Year ended March 31, 2019 2019 2019 2019 Provision for residual risk Provision for environmental liability (In millions) Balance at the beginning US$ 45.8 Rs. 3,169.6 US$ 35.9 Rs. 2,479.3 Provision made during the year 10.5 724.9 14.6 1,009.4 Provision used during the year (3.5 ) (239.5 ) (11.6 ) (799.3 ) Currency translation (0.4 ) (27.6 ) (0.8 ) (53.5 ) Balance at the end US$ 52.4 Rs. 3,627.4 US$ 38.1 Rs. 2,635.9 Current US$ 12.3 Rs. 851.2 US$ 18.1 Rs. 1,254.7 Non-current US$ 40.1 Rs. 2,776.2 US$ 20.0 Rs. 1,381.2

Other current liabilities (Tabl

Other current liabilities (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Current Liabilities	Other current liabilities consist of the following: As at March 31, 2019 2019 2018 (In millions) Contract liabilities (refer note 26 below) US$ 661.9 Rs. 45,773.8 Rs. 37,562.7 Statutory dues 566.0 39,139.0 31,768.3 Others 53.9 3,728.1 2,719.7 Total US$ 1,281.8 Rs. 88,640.9 Rs. 72,050.7

Other liabilities - non-curre_2

Other liabilities - non-current (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Other liabilities - Non-Current	Other liabilities non-current As at March 31, 2019 2019 2018 (In millions) Employee benefit obligations US$ 883.5 Rs. 61,101.2 Rs. 41,007.6 Contract liabilities (refer note below) 675.7 46,730.9 41,116.2 Others 35.6 2,455.1 2,025.5 Total US$ 1,594.8 Rs. 110,287.2 Rs. 84,149.3 Note: (a) Statement showing movement of contract liabilities during the year Year ended March 31, 2019 (In millions) Opening contract liabilities (regrouped on transition to IFRS 15) 78,678.9 Transition impact of IFRS 15 2,766.9 Amount recognized in revenue during the year (35,783.9 ) Amount received in advance during the year 49,580.5 Amount refunded to customers during the year (2,175.5 ) Reversal of liabilities directly associated with assets held-for-sale 717.7 Currency translation (1,279.9 ) Balance at the end 92,504.7 (b) Contract liabilities comprise of the following: As at March 31, (In millions) Advances received from customers - current 17,396.1 Deferred revenue - current 28,377.7 Deferred revenue -Non-current 46,730.9 Total contract liabilities 92,504.7

Equity (Tables)

Equity (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Movement of Number of Shares and Share Capital	The movement of number of shares and share capital is as follows: Year ended March 31, Year ended March 31, 2019 2018 2017 Ordinary shares ‘A’ Ordinary shares Ordinary shares ‘A’ Ordinary shares Ordinary shares ‘A’ Ordinary shares No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) No. of shares (In millions) Shares at the beginning 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,428 Rs. 5,775.2 508,502,291 Rs. 1,017.0 2,887,203,602 Rs. 5,774.8 508,476,704 Rs. 1,017.0 Shares issued # — — — — 266 0.0 * 80 0.0 * 144,826 0.4 25,587 0.0 * Shares at the end 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,694 Rs. 5,775.2 508,502,371 Rs. 1,017.0 2,887,348,428 Rs. 5,775.2 508,502,291 Rs. 1,017.0 US$ 83.5 US$ 14.7 # Out of shares held in abeyance - Rights issue of 2001, 2008 and 2015. * Amounts less than Rs. 50,000

Other components of equity (Tab

Other components of equity (Tables)	12 Months Ended
	Mar. 31, 2019
Statement [line items]
Summary of Other Components of Equity	(f) Summary of Other components of equity: Year ended March 31, 2019 2019 2018 2017 (In millions) Currency translation reserve US$ 410.5 Rs. 28,388.6 Rs. 49,388.8 Rs. (50,933.2 ) Available-for-sale — — 1,422.1 1,062.8 Investments reserve 25.8 1,785.5 — — Hedging reserve (877.2 ) (60,668.2 ) (39,224.0 ) (206,143.3 ) Cost of hedge reserve (41.6 ) (2,873.9 ) (4,473.1 ) (6,704.6 ) Total US$ (482.5 ) Rs. (33,368.0 ) Rs. 7,113.8 Rs. (262,718.3 )
Currency translation reserve [Member]
Statement [line items]
Summary of Other Components of Equity	(a) The movement of Currency translation reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 714.2 Rs. 49,388.8 Rs. (50,933.2 ) Rs. 45,936.6 Exchange differences arising on translating the net assets of foreign operations (net) (295.2 ) (20,414.1 ) 96,211.5 (93,822.8 ) Net change in translation reserve – equity accounted investees (net) (8.5 ) (586.1 ) 4,110.5 (3,047.0 ) Balance at the end US$ 410.5 Rs. 28,388.6 Rs. 49,388.8 Rs. (50,933.2 )
Equity instruments held as fair value through other comprehensive income [Member]
Statement [line items]
Summary of Other Components of Equity	(c) The movement of Available-for-sale Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ 20.6 Rs. 1,422.1 Rs. 1,062.8 Rs. 274.6 Effect of transition to IFRS 9 (refer note 2(x)) (20.6 ) (1,422.1 ) Gain/(loss) arising on revaluation of available-for-sale — — 565.8 905.6 Income tax relating to gain/loss arising on revaluation of available-for-sale — — (16.2 ) (16.0 ) Cumulative (gain)/loss reclassified to profit or loss on available-for-sale — — (169.2 ) (143.9 ) Income tax relating to cumulative gain/loss reclassified to profit or loss on available-for-sale — — 45.2 42.5 Net change in share of available-for-sale — — (66.3 ) — Balance at the end US$ — Rs. — Rs. 1,422.1 Rs. 1,062.8
Hedging reserve [Member]
Statement [line items]
Summary of Other Components of Equity	(d) The movement of Hedging reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ (567.2 ) Rs. (39,224.0 ) Rs. (206,143.3 ) Rs. (84,860.0 ) Effect of transition to IFRS 9 (refer note 2(x)) (40.8 ) (2,819.8 ) — 659.5 Gain/(loss) recognized on cash flow hedges (1,298.9 ) (89,824.6 ) 104,219.6 (258,874.4 ) Income tax relating to gain/loss recognized on cash flow hedges 245.5 16,974.8 (19,598.8 ) 49,566.0 (Gain)/loss reclassified to profit or loss 1,155.4 79,903.6 101,603.1 109,106.8 Income tax relating to gain/loss reclassified to profit or loss (219.5 ) (15,181.1 ) (19,304.6 ) (21,741.2 ) Amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges (187.4 ) (12,959.4 ) — — Tax on amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges 35.7 2,462.3 — — Balance at the end US$ (877.2 ) Rs. (60,668.2 ) Rs. (39,224.0 ) Rs. (206,143.3 )
Available-for-sale investments [Member]
Statement [line items]
Summary of Other Components of Equity	(b) The movement of Equity instruments held as fair value through other comprehensive income(FVTOCI) is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ — Rs. — Rs. Rs. Effect of transition to IFRS 9 (refer note 2(x)) 20.1 1,392.8 Other Comprehensive income for the year 6.3 438.1 — — Income tax relating to gain/(loss) recognized on equity investments, where applicable 0.1 3.9 — — Profit on sale of equity investments reclassified to retained earnings (0.7 ) (49.3 ) — — Balance at the end US$ 25.8 Rs. 1,785.5 Rs. — Rs. —
Movements of cost of hedging reserve which included time value of options forward element of forward contracts and foreign currency basis spread [Member]
Statement [line items]
Summary of Other Components of Equity	e) The movement of Cost of Hedging reserve is as follows: Year ended March 31, 2019 2019 2018 2017 (In millions) Balance at the beginning US$ (64.7 ) Rs. (4,473.1 ) Rs. (6,704.6 ) Rs. — Effect of transition to IFRS 9 (refer note 2(x)) 3.0 204.8 — (3,140.5 ) Gain/(loss) recognized on cash flow hedges (10.8 ) (746.6 ) 1,873.5 (4,084.8 ) Income tax relating to gain/loss recognized on cash flow hedges 3.0 207.5 (398.2 ) 752.1 (Gain)/loss reclassified to profit or loss 9.5 659.3 933.6 (289.3 ) Income tax relating to gain/loss reclassified to profit or loss (1.8 ) (125.3 ) (177.4 ) 57.9 Amounts removed from hedge reserve and recognized in inventory 25.0 1,727.8 — — Income tax related to amounts removed from hedge reserve and recognized in inventory (4.7 ) (328.3 ) — — Balance at the end US$ (41.5 ) Rs. (2,873.9 ) Rs. (4,473.1 ) Rs. (6,704.6 )

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of revenue	Revenue for fiscal 2019 consists of the following: Year ended March 31, 2019 2019 (In millions) Sale of products - Sale of vehicles US$ 37,260.1 Rs. 2,576,720.5 - Sale of spare parts 3,476.3 240,405.0 - Sale of miscellaneous products 1,655.0 114,449.7 Sale of Services 406.2 28,091.7 Others (Incentives) (refer note 2(x)) — — Total US$ 42,797.6 Rs. 2,959,666.9

Employee cost (Tables)

Employee cost (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Employee Cost	Employee cost consists of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Salaries, wages and welfare expenses US$ 4,589.8 Rs. 317,406.0 Rs. 270,441.8 Rs. 255,325.7 Contribution to provident fund and other funds 417.2 28,855.1 32,183.0 28,262.3 Total US$ 5,007.0 Rs. 346,261.1 Rs. 302,624.8 Rs. 283,588.0
Summary of Equity Settled Share Based Payments	Year ended Options outstanding at the beginning of the year — Granted during the year 7,812,427 Forfeited/Expired during the year — Exercised during the year — Outstanding at the end of the year 7,812,427 Maximum/Minimum number of shares to be issued for outstanding options (conditional on performance measures) 11,718,641/3,906,214
Summary of Estimated Fair Value of Options Using Black Scholes Model.	The following assumptions were used for calculation of fair value of options granted during the year ended March 31, 2019. Assumption factor Estimate Risk free rate 7%-8% Expected life of option 4-6 Expected volatility 33%-37%

Other expenses (Tables)

Other expenses (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Expenses	Other expenses consist of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Stores, spare parts and tools consumed US$ 353.4 Rs.24,441.5 Rs.22,105.6 Rs.24,191.1 Freight and transportation expenses (refer note 2(x)) 1,128.5 78,044.7 114,840.9 103,534.4 Research and product development cost 610.9 42,245.7 35,318.7 34,135.7 Warranty and product liability expenses 1,719.6 118,921.4 69,978.9 85,866.4 Allowance for trade and other receivables, and finance receivables 77.3 5,344.3 400.9 7,359.5 Works operation and other expenses 3,747.1 259,133.9 261,407.3 232,674.8 Repairs to building and plant and machinery 88.4 6,115.7 6,189.7 6,273.2 Processing charges 236.3 16,343.6 13,390.8 11,720.3 Power and fuel 229.3 15,859.3 13,080.8 11,598.2 Insurance 51.4 3,552.3 3,355.9 4,121.2 Publicity 1,262.5 87,296.3 89,685.9 86,986.8 Total US$ 9,504.7 Rs.657,298.7 Rs.629,755.4 Rs.608,461.6

Other income_(loss) (net) (Tabl

Other income/(loss) (net) (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Other Income/(Loss) (Net)	Other income/(loss) (net) consist of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Miscellaneous income US$ 245.0 Rs.16,941.8 Rs.32,508.0 Rs.25,143.9 Incentives 145.1 10,035.3 11,499.6 3,331.1 Gain / (Loss) on change in fair value of commodity derivatives 12.3 847.5 2,146.3 9,184.0 Dividend income and income on mutual funds 2.5 172.8 157.7 105.1 Gain/(loss) on sale, change in fair value of available-for-sale — — 1,561.7 1,826.0 Profit on sale of investments measured at FVTPL 18.6 1,286.1 — — Profit on sale of investment in a subsidiary company (note below) 54.5 3,769.8 — — MTM on investments measured at FVTPL 34.5 2,385.4 — — Total US$ 512.5 Rs.35,438.7 Rs.47,873.3 Rs.39,590.1 Note: During the year ended March 31, 2019, the Company has sold investment in TAL Manufacturing Solutions Limited to Tata Advanced Systems Ltd.

Interest expense (net) (Tables)

Interest expense (net) (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Interest Expense (Net)	Interest expense (net) consists of the following: Year ended March 31, 2019 2019 2018 2017 (In millions) Gross interest expense US$ 1,051.5 Rs.72,714.5 Rs.59,734.5 Rs.55,306.7 Less: Interest capitalized * (218.8 ) (15,128.5 ) (12,943.2 ) (12,941.0 ) Total US$ 832.7 Rs.57,586.0 Rs.46,791.3 Rs.42,365.7 * Represents borrowing costs capitalized during the year on qualifying assets (property plant and equipment and product development).

Employee benefits (Tables)

Employee benefits (Tables)	12 Months Ended
	Mar. 31, 2019
Pension and post retirement medical plans [Member]
Statement [line items]
Summary of Amounts Recognized in Financial Statements	The following table sets out the funded and unfunded status and the amounts recognized in the financial statements for the pension and the post retirement medical plans in respect of Tata Motors, its Indian subsidiaries and joint operations: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Change in defined benefit obligations : Defined benefit obligation, beginning of the year US$ 148.2 Rs. 10,247.9 Rs. 9,807.6 US$ 22.3 Rs. 1,540.5 Rs. 1,838.6 Current service cost 10.8 746.3 722.5 1.2 80.4 102.0 Interest cost 10.9 757.0 687.6 1.7 115.1 130.6 Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions (0.2 ) (11.9 ) (160.3 ) — — (114.0 ) Actuarial (gains) / losses arising from changes in financial assumptions 2.1 141.9 228.8 1.2 81.1 (27.0 ) Actuarial (gains) / losses arising from changes in experience adjustments 8.6 592.7 105.0 (2.2 ) (150.3 ) (289.6 ) Benefits paid from plan assets (10.3 ) (713.1 ) (1,168.5 ) — — — Benefits paid directly by employer (0.8 ) (58.2 ) (59.8 ) (1.4 ) (94.2 ) (100.1 ) Past service cost plan amendment 0.1 3.9 85.0 (0.3 ) (19.9 ) — Acquisition/(Divestment) (0.3 ) (23.9 ) — (0.3 ) (18.7 ) — Defined benefit obligation, end of the year US$ 169.1 Rs. 11,682.6 Rs. 10,247.9 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5 Change in plan assets: Fair value of plan assets, beginning of the year US$ 131.1 Rs. 9,060.4 Rs. 8,417.8 US$ — Rs. — Rs. — Interest income 10.4 716.0 633.3 — — — Remeasurements gains / (losses) Return on plan assets, (excluding amount included in net Interest cost) 0.4 27.0 (26.9 ) — — — Employer’s contributions 17.0 1,172.6 1,204.7 — — — Benefits paid (10.3 ) (713.1 ) (1,168.5 ) — — — Acquisition/(Divestment) (0.2 ) (12.5 ) — Fair value of plan assets, end of the year US$ 148.4 Rs. 10,250.4 Rs. 9,060.4 US$ — Rs. — Rs. — As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Amount recognized in the balance sheet consists of: Present value of defined benefit obligation US$ 169.1 Rs. 11,682.6 Rs. 10,247.9 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5 Fair value of plan assets 148.4 10,250.4 9,060.4 — — — Net liability US$ (20.7 ) Rs. (1,432.2 ) Rs. (1,187.5 ) US$ (22.2 ) Rs. (1,534.0 ) Rs. (1,540.5 ) Amounts in the balance sheet: Non–current assets US$ 0.2 Rs. 16.4 15.7 US$ — Rs. — Rs. — Non–current liabilities (20.9 ) (1,448.6 ) (1,069.8 ) (22.2 ) (1,534.0 ) (1,420.1 ) Liabilities for assets classified as held for sale — — (133.4 ) — — (120.4 ) Net liability US$ (20.7 ) Rs. (1,432.2 ) Rs. (1,187.5 ) US$ (22.2 ) Rs. (1,534.0 ) Rs. (1,540.5 )
Summary of Amount Recognized in Other Comprehensive Income	Total amount recognized in other comprehensive income consists of: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ 44.4 Rs. 3,068.2 Rs. 2,372.5 Rs. 2,172.1 US$ (1.7 ) Rs. (120.9 ) Rs. (51.7 ) Rs. 378.9 US$ 44.4 Rs. 3,068.2 Rs. 2,372.5 Rs. 2,172.1 US$ (1.7 ) Rs. (120.9 ) Rs. (51.7 ) Rs. 378.9
Summary of Information for Funded and Unfunded Plans	Information for funded plans with a defined benefit obligation in excess of plan assets: As at March 31, Pension benefits 2019 2019 2018 (In millions) Defined benefit obligation US$ 142.2 Rs. 9,837.0 Rs. 1,410.8 Fair value of plan assets US$ 139.0 Rs. 9,612.3 Rs. 1,262.9 Information for funded plans with a defined benefit obligation less than plan assets: As at March 31, Pension benefits 2019 2019 2018 (In millions) Defined benefit obligation US$ 9.0 Rs. 621.7 Rs. 7,781.8 Fair value of plan assets US$ 9.2 Rs. 638.1 Rs. 7,797.5 Information for unfunded plans: As at March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2019 2019 2018 (In millions) Defined benefit obligation US$ 17.7 Rs. 1,223.9 Rs. 1,055.3 US$ 22.2 Rs. 1,534.0 Rs. 1,540.5
Summary of Net Periodic Cost	Net pension and post retirement medical cost consist of the following components: Year ended March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Service cost US$ 10.8 Rs. 746.3 Rs. 722.5 Rs. 657.1 US$ 1.2 80.4 Rs. 102.0 Rs. 81.9 Past Service cost— Plan amendment 0.1 3.9 85.0 — (0.3 ) (19.9 ) — — Net interest cost / (income) 0.5 41.0 54.3 94.6 1.6 115.1 130.6 123.3 Net periodic cost US$ 11.4 Rs. 791.2 Rs. 861.8 Rs. 751.7 US$ 2.5 Rs. 175.6 Rs. 232.6 Rs. 205.2
Summary of Remeasurements (Gains)/Losses Recognized in Other Comprehensive Income	Other changes in plan assets and benefit obligation recognized in other comprehensive income for severance indemnity plan: As at March 31, 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Return on plan assets, (excluding amount included in net Interest expense) US$ 0.9 Rs. 59.9 Rs. 51.3 Rs. 25.4 Actuarial (gains) / losses arising from changes in financial assumptions 5.3 368.3 (1.4 ) (156.5 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities (3.1 ) (213.4 ) 147.0 (195.3 ) Total recognized in other comprehensive income US$ 3.1 Rs. 214.8 Rs. 196.9 Rs. (326.4) Total recognized in income statement and other comprehensive income US$ 10.7 Rs. 741.6 Rs. 647.0 Rs. 167.4
Summary of Assumptions Used	The assumptions used in accounting for the pension and post retirement medical plans are set out below: As at March 31, Pension benefits Post retirement medical benefits 2019 2018 2017 2019 2018 2017 Discount rate 6.75% - 7.70% 7.50% - 8.00% 6.75% - 7.50% 7.60% 8.00% 7.30% Rate of increase in compensation level of covered employees 5.75% - 12.0% 5.00% - 12.00% 4.00% - 11.00% NA NA NA Increase in health care cost NA NA NA 6.00% 6.00% 6.00%
Summary of Fair Value of Plan Assets by Category	The fair value of Company’s pension plan asset as of March 31, 2019 and 2018 by category are as follows: Pension benefits Plan assets as of March 31 2019 2018 Asset category: Cash and cash equivalents 6.5 % 6.0 % Debt instruments (quoted) 66.9 % 68.4 % Debt instruments (unquoted) 0.9 % 0.3 % Equity instruments (quoted) 2.6 % 1.7 % Deposits with Insurance companies 23.1 % 23.6 % 100.0 % 100.0 %
Summary of Sensitivity Analysis	The table below outlines the effect on the service cost, the interest cost and the defined benefit obligation in the event of a decrease/increase of 1% in the assumed rate of discount rate, salary escalation and health care cost: Assumption Change in assumption Impact on defined benefit Impact on service cost and Discount rate Increase by 1% Decrease by 1% Decrease by Rs. 845.5 million Increase by Rs. 951.2 million Decrease by Rs. 193.4 million Increase by Rs. 206.2 million Salary escalation rate Increase by 1% Decrease by 1% Increase by Rs. 913.1 million Decrease by Rs. 810.2 million Increase by Rs. 216.6 million Decrease by Rs. 190.3 million Health care cost Increase by 1% Decrease by 1% Increase by Rs. 193.4 million Decrease by Rs.162.6 million Increase by Rs. 42.7 million Decrease by Rs. 39.7 million
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Statement [line items]
Summary of Amounts Recognized in Financial Statements	The following table sets out, the amounts recognized in the financial statements for the severance indemnity plan. As at March 31, 2019 2019 2018 (In millions) Change in defined benefit obligation: Defined benefit obligation, beginning of the year US$ 61.5 Rs. 4,256.3 Rs. 3,482.6 Service cost 7.6 525.2 452.6 Interest cost 1.6 111.3 79.0 Remeasurements (gains) / losses - Actuarial (gains) / losses arising from changes in financial assumptions 5.3 368.3 (1.4 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities (3.1 ) (213.4 ) 147.0 Benefits paid from plan assets (10.7 ) (738.9 ) (70.8 ) Benefits paid directly by employer (1.3 ) (89.5 ) (34.9 ) Foreign currency translation 0.1 4.0 202.2 Defined benefit obligation, end of the year US$ 61.0 Rs. 4,223.3 Rs. 4,256.3 Change in plan assets: Fair value of plan assets, beginning of the year US$ 58.6 4,053.6 3,245.3 Interest income 1.6 109.7 81.5 Remeasurements gain / (loss) Return on plan assets, (excluding amount included in net Interest expense) (0.9 ) (59.9 ) (51.3 ) Employer’s contributions 3.2 219.7 656.4 Benefits paid (10.7 ) (738.9 ) (70.8 ) Foreign currency translation 0.2 16.5 192.5 Fair value of plan assets, end of the year US$ 52.0 Rs. 3,600.7 Rs. 4,053.6 As at March 31, 2019 2019 2018 (In millions) Amount recognized in the balance sheet consist of: Present value of defined benefit obligation US$ 61.0 Rs. 4,223.3 Rs. 4,256.3 Fair value of plan assets 52.0 3,600.7 4,053.6 Net liability US$ (9.0 ) Rs. (622.6 ) Rs. (202.7 ) Amounts in the balance sheet: Non- US$ (9.0 ) Rs. (622.6 ) Rs. (202.7 )
Summary of Amount Recognized in Other Comprehensive Income	Total amount recognized in other comprehensive income for severance indemnity consists of: As at March 31, 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ (5.7 ) Rs. (396.3 ) Rs. (611.1 ) Rs. (808.0 ) US$ (5.7 ) Rs. (396.3 ) Rs. (611.1 ) Rs. (808.0 )
Summary of Net Periodic Cost	Net severance indemnity cost consist of the following components: Year ended March 31, 2019 2019 2018 2017 (In millions) Service cost US$ 7.6 Rs. 525.2 Rs. 452.6 Rs. 486.2 Net interest cost — 1.6 (2.5 ) 7.6 Net periodic pension cost US$ 7.6 Rs. 526.8 Rs. 450.1 Rs. 493.8
Summary of Remeasurements (Gains)/Losses Recognized in Other Comprehensive Income	Other changes in plan assets and benefit obligation recognized in other comprehensive income. Year ended March 31, Pension benefits Post retirement medical benefits 2019 2019 2018 2017 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Return on plan assets, (excluding amount included in net Interest expense) US$ (0.4 ) Rs. (27.0 ) Rs. 26.9 Rs. (264.1 ) US$ — Rs. — Rs. — Rs. — Actuarial (gains) / losses arising from changes in demographic assumptions (0.2 ) (11.9 ) (160.3 ) (9.6 ) — — (114.0 ) 21.7 Actuarial (gains) / losses arising from changes in financial assumptions 2.1 141.9 228.8 160.1 1.2 81.1 (27.0 ) 218.2 Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 8.6 592.7 105.0 (65.0 ) (2.2 ) (150.3 ) (289.6 ) (104.6 ) Total recognized in other comprehensive income US$ 10.1 Rs. 695.7 Rs. 200.4 Rs. (178.6 ) US$ (1.0 ) Rs. (69.2 ) Rs. (430.6 ) Rs. 135.3 Total recognized in income statement and statement of other comprehensive income US$ 21.5 Rs. 1,486.9 Rs. 1,062.2 Rs. 573.1 US$ 1.5 Rs. 106.4 Rs. (198.0 ) Rs. 340.5
Summary of Assumptions Used	The assumptions used in accounting for the Severance indemnity plan is set out below: As at March 31, 2019 2018 2017 Discount rate 2.0 % 2.8 % 2.3 % Rate of increase in compensation level of covered employees 3.5 % 3.5 % 3.0 %
Summary of Fair Value of Plan Assets by Category	Severance indemnity plans asset allocation by category is as follows: As at March 31, 2019 2018 Deposit with banks 100% 100%
Summary of Sensitivity Analysis	The table below outlines the effect on the service cost, the interest cost and the defined benefit obligation in the event of a decrease/increase of 1% in the assumed rate of discount rate, salary escalation rate: Assumption Change in assumption Impact on defined benefit obligation Impact on service cost and interest cost Discount rate Increase by 1% Decrease by 1% Decrease by Rs. 440.1 millions Increase by Rs. 516.2 millions Decrease by Rs. 123.2 millions Increase by Rs. 135.6 millions Salary escalation rate Increase by 1% Decrease by 1% Increase by Rs. 503.0 millions Decrease by Rs. 438.2 millions Increase by Rs. 148.6 millions Decrease by Rs. 128.4 millions
Jaguar Land Rover Pension plan [member]
Statement [line items]
Summary of Amounts Recognized in Financial Statements	The following table sets out the disclosure pertaining to employee benefits of Jaguar Land Rover Limited As at March 31, Pension benefits 2019 2019 2018 (In millions) Change in defined benefit obligation: Defined benefit obligation, beginning of the year US$ 11,102.6 Rs. 767,800.4 Rs. 806,676.9 Service cost 209.5 14,490.5 18,561.3 Interest cost 286.5 19,814.7 20,584.3 Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions (65.5 ) (4,533.1 ) (17,990.4 ) Actuarial (gains) / losses arising from changes in financial assumptions 718.0 49,653.7 (30,177.8 ) Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 47.4 3,276.9 (8,487.5 ) Past service cost/(credit) 54.9 3,799.0 (36,090.1 ) Plan settlement — — (1,807.6 ) Benefits paid (818.1 ) (56,573.7 ) (84,441.3 ) Member contributions 2.0 135.8 324.8 Foreign currency translation (219.8 ) (15,199.3 ) 100,647.8 Defined benefit obligation, end of the year US$ 11,317.5 Rs. 782,664.9 Rs. 767,800.4 Change in plan assets: Fair value of plan assets, beginning of the year US$ 10,518.1 Rs. 727,378.9 Rs. 688,454.9 Interest Income 275.3 19,040.2 18,661.3 Remeasurements gains / (losses) Return on plan assets, (excluding amount included in net Interest expense) 341.6 23,626.2 (9,974.6 ) Employer’s contributions 348.2 24,078.1 24,554.2 Members contributions 2.0 135.8 324.8 Plan settlement — — (1,749.5 ) Benefits paid (818.1 ) (56,573.7 ) (84,441.3 ) Expenses paid (17.2 ) (1,186.5 ) (777.7 ) Foreign currency translation (203.9 ) (14,098.0 ) 92,326.9 Fair value of plan assets, end of the year US$ 10,446.0 Rs. 722,401.0 Rs. 727,378.9 As at March 31, Pension benefits 2019 2019 2018 (In millions) Amount recognized in the balance sheet consist of: Present value of defined benefit obligation US$ 11,317.5 Rs. 782,664.9 Rs. 767,800.4 Fair value of plan Assets 10,446.0 722,401.0 727,378.9 Net liability US$ (871.5 ) Rs. (60,263.9 ) Rs. (40,421.5 ) Amount recognized in the balance sheet consist of: Non- US$ — Rs. — Rs. — Non -current liabilities (871.5 ) (60,263.9 ) (40,421.5 ) Net liability US$ (871.5 ) Rs. (60,263.9 ) Rs. (40,421.5 )
Summary of Amount Recognized in Other Comprehensive Income	Total amount recognized in other comprehensive income consists of: As at March 31, Pension benefits 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses US$ 2,212.2 Rs. 152,983.4 Rs. 128,212.1 Rs. 174,893.2 Restriction of Pension asset (as per IFRIC 14) (201.4 ) (13,928.1 ) (13,928.1 ) (13,928.1 ) Onerous obligation, excluding amounts included in interest expenses (125.1 ) (8,650.4 ) (8,650.4 ) (8,650.4 ) US$ 1,885.7 Rs. 130,404.9 Rs. 105,633.6 Rs. 152,314.7
Summary of Net Periodic Cost	Net pension and post retirement cost consist of the following components: Year ended March 31, Pension benefits 2019 2019 2018 2017 (In millions) Current service cost US$ 209.5 Rs. 14,490.5 Rs. 18,561.3 Rs. 17,357.3 Past service cost/(credit) 54.9 3,799.0 (36,090.1 ) — Administrative expenses 17.2 1,186.5 777.7 789.0 Plan settlement — — (58.1 ) — Net interest cost / (income) (including onerous obligations) 11.2 774.5 1,923.0 1,490.3 Net periodic pension cost US$ 292.8 Rs. 20,250.5 Rs. (14,886.2 ) Rs. 19,636.6
Summary of Remeasurements (Gains)/Losses Recognized in Other Comprehensive Income	Amount recognized in other comprehensive income Year ended March 31, Pension benefits 2019 2019 2018 2017 (In millions) Remeasurements (gains) / losses Actuarial (gains) / losses arising from changes in demographic assumptions US$ (65.5 ) Rs. (4,533.1 ) Rs. (17,990.4 ) Rs. (6,662.4 ) Actuarial (gains) / losses arising from changes in financial assumptions 718.0 49,653.7 (30,177.8 ) 204,693.3 Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities 47.4 3,276.9 (8,487.5 ) (18,672.2 ) Return on plan assets, (excluding amount included in net Interest expense) (341.6 ) (23,626.2 ) 9,974.6 (100,724.9 ) Change in onerous obligation, excluding amounts included in interest expenses — — — (175.3 ) Total recognized in other comprehensive income US$ 358.3 Rs. 24,771.3 Rs. (46,681.1 ) Rs. 78,458.5 Total recognized in income statement and other comprehensive income US$ 651.1 Rs. 45,021.8 Rs. (61,567.3 ) Rs. 98,095.1
Summary of Assumptions Used	The assumptions used in accounting for the pension plans are set out below: As at March 31, Pension benefits 2019 2018 2017 Discount rate 2.4 % 2.70 % 2.60 % Expected rate of increase in compensation level of covered employees 2.4 % 2.30 % 3.70 % Inflation increase 3.2 % 3.10 % 3.20 % The assumed life expectations on retirement at age 65 are (years) Retiring today : Males 21.0 21.3 21.5 Females 23.2 23.4 24.5 Retiring in 20 years : Males 22.4 22.5 23.3 Females 25.1 25.1 26.3
Summary of Fair Value of Plan Assets by Category	Pension plans asset allocation by category is as follows: As at March 31, 2019 2018 Quoted * Unquoted Total Quoted * Unquoted Total (In millions) Equity Instruments Information Technology 7,166.5 — 7,166.5 12,181.6 — 12,181.6 Energy 3,047.5 — 3,047.5 5,167.9 — 5,167.9 Manufacturing 5,223.0 — 5,223.0 8,859.3 — 8,859.3 Financials 8,224.1 — 8,224.1 13,935.0 — 13,935.0 Others 22,724.1 — 22,724.1 38,482.7 — 38,482.7 46,385.2 — 46,385.2 78,626.5 — 78,626.5 Debt Instruments Government 227,093.5 — 227,093.5 351,696.7 — 351,696.7 Corporate Bonds (Investment Grade) 13,519.8 153,280.4 166,800.2 1,845.7 169,434.6 171,280.3 Corporate Bonds (Non Investment Grade) — 55,472.6 55,472.6 — 53,894.2 53,894.2 240,613.3 208,753.0 449,366.3 353,542.4 223,328.8 576,871.2 Property Funds UK — 22,112.6 22,112.6 — 15,227.0 15,227.0 Other — 20,763.6 20,763.6 — 14,765.5 14,765.5 — 42,876.2 42,876.2 — 29,992.5 29,992.5 Cash and Cash equivalents 19,047.9 — 19,047.9 20,109.4 — 20,109.4 Other Hedge Funds — 28,032.9 28,032.9 — 32,853.3 32,853.3 Private Markets 381.7 30,392.9 30,774.6 184.6 23,255.7 23,440.3 Alternatives 1,394.7 73,373.0 74,767.7 43,373.8 19,748.9 63,122.7 1,776.4 131,798.8 133,575.2 43,558.4 75,857.9 119,416.3 Derivatives Foreign exchange contracts — 1,478.2 1,478.2 — 92.3 92.3 Interest Rate and inflation — 29,672.0 29,672.0 — 21,041.0 21,041.0 — 31,150.2 31,150.2 — 21,133.3 21,133.3 Collateralized debt obligations — — — (118,770.3 ) (118,770.3 ) — — — — (118,770.3 ) (118,770.3 ) Total 307,822.8 414,578.2 722,401.0 495,836.7 231,542.2 727,378.9 * determined on the basis of quoted prices for identical assets or liabilities in active markets.
Summary of Sensitivity Analysis	The sensitivity analysis below is based on a change in an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. When calculating the sensitivity of the defined benefit obligation to significant actuarial assumptions the same method (present value of the defined benefit obligation calculated with the projected unit credit method at the end of the reporting period) has been applied as when calculating the pension liability recognized within the consolidated balance sheet. Assumption Change in assumption Impact on defined benefit Impact on service cost and interest cost Discount rate Increase / decrease by 0.25% Decrease/increase by Decrease/increase by Inflation rate Increase / decrease by 0.25% Increase/decrease by Increase/decrease by Mortality rate Increase / decrease by 1 year Increase/decrease by Increase/decrease by

Capital Management (Tables)

Capital Management (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Capital	The following table summarizes the capital of the Company: As at March 31, 2019 2019 2018 (In millions) Equity* US$ 8,575.3 Rs. 593,022.3 Rs. 907,631.5 Short-term borrowings and current portion of long-term debt 5,087.8 351,843.7 277,287.4 Long-term debt 10,238.8 708,067.0 611,419.4 Total debt 15,326.6 1,059,910.7 888,706.8 Total capital (Debt + Equity) US$ 23,901.9 Rs. 1,652,933.0 Rs. 1,796,338.3 * Details of equity : As at March 31, 2019 2019 2018 (In millions) Total equity as reported in balance sheet US$ 8,069.9 Rs. 558,067.4 Rs. 913,521.0 Currency translation reserve attributable to - Shareholders of Tata Motors Limited (410.5 ) (28,388.6 ) (49,388.8 ) - Non-controlling (2.9 ) (198.6 ) (197.8 ) Hedging reserve 877.2 60,668.2 39,224.0 Cost of hedge reserve 41.6 2,873.9 4,473.1 Equity as reported above US$ 8,575.3 Rs. 593,022.3 Rs. 907,631.5

Disclosures on financial inst_2

Disclosures on financial instruments (Tables)	12 Months Ended
	Mar. 31, 2019
Statement [line items]
Summary of Carrying Amounts and Fair Value of Each Category of Financial Assets and Liabilities	The following table presents the carrying amounts and fair value of each category of financial assets and liabilities as at March 31, 2019. Financial assets Cash and financial cost Investments - Investments - Investments - cost Derivatives Derivatives Total carrying value Total fair value Total value Total fair value (In millions) Cash and cash equivalents Rs. 215,598.0 Rs. — Rs. — Rs. — Rs. — Rs. — Rs. 215,598.0 Rs. 215,598.0 US$ 3,117.6 US$ 3,117.6 Short-term deposits 105,742.1 — — — — — 105,742.1 105,742.1 1,529.1 1,529.1 Finance receivables 336,246.9 — — — — — 336,246.9 334,290.5 4,862.2 4,833.9 Trade receivables 189,961.7 — — — — — 189,961.7 189,961.7 2,746.9 2,746.9 Other investments - non-current — 7,412.9 7,523.4 38.8 — — 14,975.1 14,975.1 216.8 216.8 Other investments - current — 9.2 11,919.0 77,455.1 — — 89,383.3 89,383.3 1,292.5 1,292.5 Other financial assets: - current 37,615.3 — — — 2,840.2 9,515.2 49,970.7 49,970.7 722.6 722.6 - non-current 23,054.6 — — — 5,219.4 3,892.0 32,166.0 32,166.0 465.1 465.1 Total Rs. 908,218.6 Rs. 7,422.1 Rs. 19,442.4 Rs. 77,493.9 Rs. 8,059.6 Rs. 13,407.2 Rs. 1,034,043.8 Rs. 1,032,087.4 US$ 14,952.8 US$ 14,924.5 Financial liabilities Derivatives Derivatives Other Total carrying Total fair Total carrying Total fair (In millions) Accounts payable Rs. — Rs. — Rs. 759,681.7 Rs. 759,681.7 Rs. 759,681.7 US$ 10,985.2 US$ 10,985.2 Acceptances — — 31,771.2 31,771.2 31,771.2 459.5 459.5 Short-term debt (excluding current portion of long-term debt) — — 201,502.6 201,502.6 201,502.6 2,913.8 2,913.8 Long-term debt (including current portion of long-term debt) (refer note below) — — 858,408.1 858,408.1 827,757.5 12,412.7 11,969.6 Other financial liabilities: - current 8,853.9 38,571.4 56,243.9 103,669.2 103,669.2 1,499.1 1,499.1 - non-current 1,959.0 24,665.4 2,864.4 29,488.8 29,488.8 426.4 426.4 Total Rs. 10,812.9 Rs. 63,236.8 Rs. 1,910,471.9 Rs. 1,984,521.6 Rs. 1,953,871.0 US$ 28,696.7 US$ 28,253.6 1 Includes USD denominated bonds designated as cash flow hedges against forecasted USD revenue amounting to Rs. 69,148.8 million (USD 1,000 million) 2 Inculdes Rs. 34,585.5 million designated as hedged item in fair value hedge relationship. This includes a loss of Rs. 445.6 million on account of fair value changes attributable to the hedged interest rate risk. The following table presents the carrying amounts and fair value of each category of financial assets and liabilities as at March 31, 2018. Financial assets Cash, and loans and receivables Available- for-sale financial assets Derivatives other than in relationship Derivatives in hedging Total carrying value Total fair value (In millions) Cash and cash equivalents Rs. 147,167.5 Rs. — Rs. — Rs. — Rs. 147,167.5 Rs. 147,167.5 Short-term deposits 193,615.7 — — — 193,615.7 193,615.7 Finance receivables 238,989.7 — — — 238,989.7 238,235.9 Trade receivables 198,933.0 — — — 198,933.0 198,933.0 Unquoted equity investments* — 2,036.9 — — 2,036.9 — Unquoted equity investments at fair value — 4,076.1 — — 4,076.1 4,076.1 Other investments 1,094.0 147,007.0 — — 148,101.0 148,101.0 Other financial assets: - current 33,682.3 — 13,931.8 10,829.5 58,443.6 58,443.6 - non-current 22,123.8 — 11,880.7 16,588.3 50,592.8 50,592.8 Total Rs. 835,606.0 Rs. 153,120.0 Rs. 25,812.5 Rs. 27,417.8 Rs. 1,041,956.3 Rs. 1,039,165.6 * The fair value in respect of the unquoted equity investments cannot be reliably measured. Financial liabilities Derivatives Derivatives in Other financial liabilities Total carrying Total fair value (In millions) Accounts payable Rs. — Rs. — Rs. 804,601.6 Rs. 804,601.6 Rs. 804,601.6 Acceptances — — 49,013.4 49,013.4 49,013.4 Short-term debt (excluding current portion of long-term debt) — — 167,948.5 167,948.5 167,948.5 Long-term debt (including current portion of long-term debt) (refer note below) — — 720,758.3 720,758.3 727,920.3 Other financial liabilities: - current 8,090.1 53,986.5 57,042.0 119,118.6 119,118.6 - non-current 1,395.1 23,106.9 3,385.4 27,887.4 27,887.4 Total Rs. 9,485.2 Rs. 77,093.4 Rs. 1,802,749.2 Rs. 1,889,327.8 Rs. 1,896,489.8 * Includes USD denominated bonds designated as cash flow hedges against forecasted USD revenue amounting to Rs.111,664.4 million (USD 1,700 million)
Summary of Amounts that have been Offset and Amounts that are Available for Offset	The following table discloses the amounts that have been offset, in arriving at the balance sheet presentation and the amounts that are available for offset only under certain conditions as at March 31, 2019: Gross Gross Net amount balance sheet Amounts subject to an Net amount Financial assets Financial Cash (In millions) Derivative financial instruments Rs. 21,466.8 Rs. — Rs. 21,466.8 Rs. (17,173.7 ) Rs. — Rs. 4,293.1 Trade receivables 191,052.4 (1,090.7 ) 189,961.7 — — 189,961.7 Cash and cash equivalents 254,334.7 (38,736.7 ) 215,598.0 — — 215,598.0 Total Rs. 466,853.9 Rs. (39,827.4 ) Rs. 427,026.5 Rs. (17,173.7 ) Rs. — Rs. 409,852.8 US$ 6,750.9 US$ (575.9 ) US$ 6,175.0 US$ (248.3 ) US$ — US$ 5,926.7 Financial liabilities Derivative financial instruments Rs. 74,049.7 Rs. — Rs. 74,049.7 Rs. (17,173.7 ) Rs. — Rs. 56,876.0 Accounts payable 760,772.4 (1,090.7 ) 759,681.7 — — 759,681.7 Loans from banks/financial institutions (short-term) 129,983.7 (38,736.7 ) 91,247.0 — — 91,247.0 Total Rs. 964,805.8 Rs. (39,827.4 ) Rs. 924,978.4 Rs. (17,173.7 ) Rs. — Rs. 907,804.7 US$ 13,951.3 US$ (575.9 ) US$ 13,375.4 US$ (248.3 ) US$ — US$ 13,127.1 The following table discloses the amounts that have been offset in arriving at the balance sheet presentation and the amounts that are available for offset only under certain conditions as at March 31, 2018: Gross Gross Net amount in the balance sheet Amounts subject to an Net amount Financial assets Financial Cash (In millions) Derivative financial instruments Rs. 53,230.3 Rs. — Rs. 53,230.3 Rs. (49,058.2 ) Rs. — Rs. 4,172.1 Trade receivables 199,905.7 (972.7 ) 198,933.0 — — 198,933.0 Cash and cash equivalents 163,843.3 (16,675.8 ) 147,167.5 — — 147,167.5 Total Rs. 416,979.3 Rs. (17,648.5 ) Rs. 399,330.8 Rs. (49,058.2 ) Rs. — Rs. 350,272.6 Financial liabilities Derivative financial instruments Rs. 86,578.6 Rs. — Rs. 86,578.6 Rs. (49,058.2 ) Rs. — Rs. 37,520.4 Accounts payable 805,574.3 (972.7 ) 804,601.6 — — 804,601.6 Loans from banks/financial institutions (short-term) 77,948.8 (16,675.8 ) 61,273.0 — — 61,273.0 Total Rs. 970,101.7 Rs. (17,648.5 ) Rs. 952,453.2 Rs. (49,058.2 ) Rs. — Rs. 903,395.0
Summary of Carrying Amount of Trade Receivables and Finance Receivables Sold Along with Associated Liabilities	The carrying amount of trade receivables and finance receivables along with the associated liabilities is as follows: As at March 31, 2019 2019 2018 Nature of Asset Carrying Carrying Carrying Carrying Carrying Carrying (In millions) Trade receivables US$ 149.2 US$ 149.2 Rs. 10,314.6 Rs. 10,314.6 Rs. 15,074.4 Rs. 15,074.4 Finance receivables US$ 438.7 US$ 440.7 Rs. 30,338.3 * Rs. 30,473.3 Rs. 13,069.1 * Rs. 13,205.8 * Net of provision of Rs. 380.3 million and Rs. 226.2 million as at March 31, 2019 and 2018, respectively.
Summary of Gain (Loss) from Cash Flow Hedges Recognized in Other Comprehensive Income and Income Statement	The accumulated gain/losses in hedge reserve and cost of hedge reserve are expected to be recognized in the income statement during the years ending March 31, 2020 to 2024. Year ended March 31, 2019 2019 2018 2017 Fair value gain/(loss) of foreign currency derivative contracts recognized in hedging reserve and cost of hedge reserve US$ (1,171.2 ) Rs. (80,992.4 ) Rs. 94,016.9 Rs. (249,818.5 ) Fair value gain/(loss) of foreign currency bonds recognized in hedging reserve (136.3 ) (9,429.1 ) 12,435.2 (13,140.7 ) Fair value gain/(loss) of cross currency interest rate swaps entered for cash flow hedges of repayment of foreign currency denominated borrowings recognized in hedging reserve 6.4 446.0 (359.0 ) — Fair value gain/(loss) of interest rate swaps entered for cash flow hedges of payment of interest on borrowings that are benchmarked to libor (8.6 ) (595.7 ) — — Gain/(loss) recognized in hedging reserve and cost of hedge reserve US$ (1,309.7 ) (90,571.2 ) 106,093.1 (262,959.2 ) Gain/(loss) reclassified from Hedging reserve and recognized in ‘Revenue’ in the income statement on occurance of forecast sales US$ (1,150.0 ) Rs. (79,529.5 ) Rs. (118,767.0 ) Rs. (112,697.8 ) Gain/(loss) reclassified out of Hedging reserve and recorded in ‘Raw materials, components and consumables’ in the income statement when forecast purchases affect income statement — — 15,674.8 7,553.4 Gain/(loss) reclassified from Hedging reserve and recognized in ‘Foreign exchange (gain)/loss (net)’ in the income statement on account of forecast transactions no longer expected to occur (14.9 ) (1,033.4 ) 555.5 (3,673.1 ) Gain/(loss) reclassified from other components of equity to income statement US$ (1,164.9 ) Rs. (80,562.9 ) Rs. (102,536.7 ) Rs. (108,817.5 )
Summary of Contractual Maturities of Financial Liabilities	Carrying amount Due in 1 st Year Due in 2 nd Year Due in 3 rd to 5 th Due after 5 th Year Total contractual cash flows (In millions) Financial liabilities Accounts payable and acceptances Rs. 791,452.9 Rs. 791,452.9 Rs. — Rs. — Rs. — Rs. 791,452.9 US$ 11,444.6 Borrowings and interest thereon 1,070,506.5 398,168.8 184,162.3 438,942.3 195,065.9 1,216,339.3 17,588.6 Other financial liabilities 48,512.5 45,648.1 1,068.5 1,887.4 3,563.2 52,167.2 754.4 Derivative liabilities 74,049.7 47,425.3 28,341.0 13,643.1 3,001.4 92,410.8 1,336.3 Total Rs. 1,984,521.6 Rs. 1,282,695.1 Rs. 213,571.8 Rs. 454,472.8 Rs. 201,630.5 Rs. 2,152,370.2 US$ 31,123.9 Carrying Due in 1 st Year Due in 2 nd Due in 3 rd th Total contractual cash flows (In millions) Collateralized debt obligations Rs. 30,473.3 Rs. 14,824.2 Rs. 10,134.0 Rs. 5,515.1 Rs. 30,473.3 US$ 440.7 The table below provides details regarding the contractual maturities of financial liabilities, including estimated interest payments as at March 31, 2018: Carrying amount Due in 1 st Year Due in 2 nd Year Due in 3 rd th Due after 5 th Total contractual cash flows (In millions) Financial liabilities Accounts payable and acceptances Rs. 853,615.0 Rs. 853,615.0 Rs. — Rs. — Rs. — Rs. 853,615.0 Borrowings and interest thereon 899,664.0 311,803.8 149,973.7 398,648.1 160,292.0 1,020,717.6 Other financial liabilities 49,470.2 46,273.1 1,717.9 1,176.9 1,069.2 50,237.1 Derivative liabilities 86,578.6 62,076.6 29,688.0 12,188.2 1,207.6 105,160.4 Total Rs. 1,889,327.8 Rs. 1,273,768.5 Rs. 181,379.6 Rs. 412,013.2 Rs. 162,568.8 Rs. 2,029,730.1 Carrying Due in 1 st Due in 2 nd Due in 3 rd th Total (In millions) Collateralized debt obligations Rs.13,205.8 Rs.7,280.9 Rs.5,924.9 Rs. — Rs.13,205.8
Summary of Fair Value of Derivative Financial Instruments	The fair value of derivative financial instruments is as follows: As at March 31, 2019 2019 2018 (In millions) Foreign currency forward exchange contracts and options US$ (758.1 ) Rs. (52,426.5 ) Rs. (37,089.3 ) Commodity Derivatives 14.7 1,019.5 (2.4 ) Others including interest rate and currency swaps (17.0 ) (1,175.9 ) 3,743.4 Total US$ (760.4 ) Rs. (52,582.9 ) Rs. (33,348.3 )
Summary of Changes in Foreign Currency Forward Exchange Contracts and Options Due to 10% Appreciation/Depreciation of Foreign Currency	As at March 31, 2019 2019 2018 2017 (In millions) 10% depreciation of foreign currency: Gain/(loss) in hedging reserve US$ 30.9 Rs. 2,136.0 Rs. 71,814.7 Rs. 130,521.6 Gain/(loss) in statement of Profit and loss US$ 13.4 Rs. 925.0 Rs. (7,371.1 ) Rs. (9,481.3 ) 10% Appreciation of foreign currency: Gain/(loss) in hedging reserve US$ (33.8 ) Rs. (2,335.1 ) Rs. (83,992.3 ) Rs. (129,631.5 ) Gain/(loss) in statement of Profit and loss US$ 0.1 Rs. 6.7 Rs. 10,373.6 Rs. 7,679.5
Disclosure on Detailed Financials Instruments Designated as Hedging Instrument in Cashflow Hedge	The details of cash flow hedges entered by the Company to hedge interest rate risk arising on floating rate borrowings and by one of the Company’s subsidiaries to hedge the currency fluctuation of its functional currency (GBP) against foreign currencies to hedge future cash flows arising from revenue and cost of materials is as follows: Outstanding contracts Average strike Nominal amounts Carrying value (in GBP) (GBP in million) (in millions) as at March as at March 31 as at March 31 2019 2018 2019 2018 2019 2019 2018 Cash flow hedges of foreign exchange risk on forecast transactions Foreign currency derivative instruments Sell - USD <1 year 0.6756 0.6483 1,584.0 2,257.0 US$ (241.6 ) Rs. (16,706.2 ) Rs. (16,426.7 ) Between 1-5 years 0.6989 0.6771 1,945.0 2,988.0 (149.2 ) (10,318.2 ) (5,075.7 ) Sell - Chinese Yuan <1 year 0.1054 0.1018 2,132.0 2,984.0 (200.2 ) (13,848.1 ) (27,685.4 ) Between 1-5 years 0.1075 0.1051 1,299.0 2,582.0 (56.3 ) (3,892.0 ) (7,659.6 ) Buy - Euro <1 year 0.8823 0.8521 3,609.0 2,568.0 18.3 1,267.1 12,919.8 Between 1-5 years 0.9192 0.8994 4,030.0 4,490.0 (95.5 ) (6,607.3 ) 13,196.7 Other currencies <1 year 0.0024 0.0020 1,800.0 1,748.0 2.6 181.0 (5,721.6 ) Between 1-5 years 0.0044 0.0033 882.0 1,560.0 14.4 995.6 3,691.4 Total foreign currency derivative instruments 17,281.0 21,177.0 US$ (707.5) Rs. (48,928.1 ) Rs. (32,761.0 ) Debt instruments denominated in foreign currency USD < 1 year 0.7358 0.6727 736.0 471.0 US$ (999.9 ) Rs. (69,148.8 ) Rs. (46,142.3 ) Between 1-5 years — 0.7358 — 736.0 — — (65,614.4 ) Total debt instruments denominated in foreign currency 736.0 1,207.0 US$ (999.9 ) Rs. (69,148.8 ) Rs. (111,756.7 ) Total cash flow hedges of foreign exchange risk on forecast transactions 18,017.0 22,384.0 US$ (1,707.4 ) Rs. (118,076.9 ) Rs. (144,517.7 ) Cash flow hedges of foreign exchange risk on recognized debt Cross currency interest rate swaps USD >5 years 0.7592 0.7592 379.6 379.6 US$ 14.5 Rs. 1,004.7 Rs. (2,676.3 ) EUR >5 years 0.8912 — 446.0 — (19.2 ) (1,330.5 ) — Total cross currency interest rate swaps 825.6 379.6 US$ (4.7 ) Rs. (325.8 ) Rs. (2,676.3 ) Total cash flow hedges of foreign exchange risk arising from outstanding debt 825.6 379.6 US$ (4.7 ) Rs. (325.8 ) Rs. (2,676.3 ) Cash flow hedges of interest rate risk arising on floating rate borrowings Average strike Nominal amounts Carrying value (USD in million) (in millions) as at March as at March 31 as at March 31 2019 2018 2019 2018 2019 2019 2018 Interest rate swaps linked to LIBOR >5 years 2.86 % — 237.5 — US$ (8.3 ) Rs. (575.7 ) Rs. — Total derivatives designated in hedge relationship US$ (720.5 ) Rs. (49,829.6 ) Rs. (35,437.3 ) Total debt instruments designated in hedge relationship US$ (999.9 ) Rs. (69,148.8 ) Rs. (111,756.7 )
Foreign currency exchange rate risk [member]
Statement [line items]
Summary of Foreign Currency Exposure	The following table sets forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2019: U.S. dollar Euro Chinese GBP Japanese Others* Total (In millions) Financial assets Rs. 227,659.7 Rs. 125,940.9 Rs. 19,853.1 Rs. 16,006.7 Rs. 3,398.6 Rs. 27,184.6 420,043.6 Financial liabilities Rs. 390,892.0 Rs. 322,260.4 Rs. 38,501.1 Rs. 59,269.8 Rs. 4,405.9 Rs. 28,285.3 843,614.5 * Others mainly include currencies such as the Russian rouble, Singapore dollars, Swiss franc, Australian dollars, South African rand, Thai baht and Korean won. The following table set forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2018: U.S. dollar Euro Chinese GBP Japanese Others* Total (In millions) Financial assets Rs. 135,310.7 Rs. 128,171.7 Rs. 49,977.2 Rs. 15,115.0 Rs. 4,750.2 Rs. 41,652.4 374,977.2 Financial liabilities Rs. 369,091.0 Rs. 311,926.9 Rs. 53,989.1 Rs. 63,716.6 Rs. 5,456.5 Rs. 35,389.5 839,569.6 * Others mainly include currencies such as the Russian rouble, Singapore dollars, Swiss franc, Australian dollars, South African rand, Singapore dollars, Thai baht and Korean won. The following table set forth information relating to foreign currency exposure (other than risk arising from derivatives disclosed at clause (iv) below) as at March 31, 2017: U.S. dollar Euro Chinese Japanese Others* Total (In millions) Financial assets Rs. 104,987.4 Rs. 98,624.2 Rs. 40,009.6 Rs. 1,279.8 Rs. 44,323.2 Rs. 289,224.2 Financial liabilities Rs. 375,478.7 Rs. 213,018.3 Rs. 33,991.9 Rs. 5,382.2 Rs. 29,392.5 Rs. 657,263.6 * Others mainly include currencies such as the Russian rouble, Swiss franc, Australian dollars, South African rand, Singapore Dollars, Thai baht and Korean won.
Not measured at fair value on recurring basis [Member]
Statement [line items]
Summary of Fair Value of Financial Assets and Liabilities	The following table provides an analysis of fair value of financial instruments that are not measured at fair value on recurring basis, grouped into Level 1 to Level 3 categories: As at March 31, 2019 Level 1 Level 2 Level 3 Total (In millions) Financial assets not measured at fair value Finance receivables — — 334,290.5 334,290.5 Other investments 77,455.1 — 38.8 77,493.9 Total Rs. 77,455.1 Rs. — Rs. 334,329.3 Rs. 411,784.4 US$ 1,120.0 US$ — US$ 4,834.5 US$ 5,954.5 Financial liabilities not measured at fair value Short-term debt (excluding current portion of long-term debt) — 201,502.6 — 201,502.6 Long-term debt (including current portion of long-term debt) 352,851.5 474,906.0 — 827,757.5 Total Rs. 352,851.5 Rs. 676,408.6 Rs. — Rs. 1,029,260.1 US$ 5,102.3 US$ 9,781.2 US$ — US$ 14,883.5 As at March 31, 2018 Level 1 Level 2 Level 3 Total (In millions) Financial assets not measured at fair value Finance receivables — — 238,235.9 238,235.9 Other investments — 1,094.0 — 1,094.0 Total Rs. — Rs. 1,094.0 Rs. 238,235.9 Rs. 239,329.9 Financial liabilities not measured at fair value Short-term debt (excluding current portion of long-term — 167,948.5 — 167,948.5 Long-term debt (including current portion of long-term 399,497.0 328,423.3 — 727,920.3 Total Rs. 399,497.0 Rs. 496,371.8 Rs. — Rs. 895,868.8
Measured at fair value [Member]
Statement [line items]
Summary of Fair Value of Financial Assets and Liabilities	The main items in this category are unquoted equity shares, measured at fair value through other comprehensive income. As at March 31, 2019 Level 1 Level 2 Level 3 Total (In millions) Financial assets measured at fair value Investments Rs. 19,481.9 Rs. — Rs. 7,382.6 Rs. 26,864.5 Derivative assets — 21,466.8 — 21,466.8 Total Rs. 19,481.9 Rs. 21,466.8 Rs. 7,382.6 Rs. 48,331.3 US$ 281.7 US$ 310.5 US$ 106.8 US$ 698.9 Financial liabilities measured at fair value Derivative liabilities Rs. — Rs. 74,049.7 Rs. — Rs. 74,049.7 Total Rs. — Rs. 74,049.7 Rs. — Rs. 74,049.7 US$ — US$ 1,070.7 US$ — US$ 1,070.7 As at March 31, 2018 Level 1 Level 2 Level 3 Total (In millions) Financial assets measured at fair value Available-for-sale Rs. 147,007.0 Rs. — Rs. — Rs. 147,007.0 Unquoted equity investments — — 4,076.1 4,076.1 Derivative assets — 53,230.3 — 53,230.3 Total Rs. 147,007.0 Rs. 53,230.3 Rs. 4,076.1 Rs. 204,313.4 Financial liabilities measured at fair value Derivative liabilities Rs. — Rs. 86,578.6 Rs. — Rs. 86,578.6 Total Rs. — Rs. 86,578.6 Rs. — Rs. 86,578.6
Trade receivables and finance receivables [Member]
Statement [line items]
Summary of Aging of Trade and Finance Receivables	As at March 31, 2019 2019 2019 2019 2019 2019 2018 2018 2018 Trade receivables Gross Allowance Net Gross Allowance Net Gross Allowance Net (In millions) Period (in months) Not due US$ 2,182.0 US$ (4.7 ) US$ 2,177.4 Rs.150,898.8 Rs. (324.1 ) Rs.150,574.7 Rs.159,519.0 Rs. (215.7 ) Rs.159,303.3 Overdue up to 3 months 449.5 (1.9 ) 447.6 31,086.5 (131.0 ) 30,955.5 32,819.4 (371.5 ) 32,447.9 Overdue 3-6 36.4 (2.7 ) 33.8 2,516.9 (183.7 ) 2,333.2 2,243.6 (354.8 ) 1,888.8 Overdue more than 6 months 219.1 (131.0 ) 88.1 15,160.5 (9,062.2 ) 6,098.3 * 16,967.8 (11,674.8 ) 5,293.0 * Total US$ 2,887.0 US$ (140.3 ) US$ 2,746.9 Rs.199,662.7 Rs. (9,701.0 ) Rs.189,961.7 Rs.211,549.8 Rs. (12,616.8 ) Rs.198,933.0 * Trade receivables overdue more than six months include Rs. 5,130.8 million as at March 31, 2019 (Rs. 4,622.2 million as at March 31, 2018) outstanding from state government organizations in India, which are considered recoverable. The Company makes allowances for losses on its portfolio of finance receivable on the basis of expected future collection from receivables. The future collection are estimated on the basis of past collection trend which are adjusted for changes in current circumstances as well as expected changes in colelction on account of future with respect to certain macro economic factor like GDP growth, fuel price and inflation. As at March 31, 2019 2019 2019 2019 2019 2019 2018 2018 2018 Finance receivables # Gross Allowance Net Gross Allowance Net Gross Allowance Net (In millions) Period (in months) Not due* US$ 4,863.7 US$ (87.9 ) US$ 4,775.8 Rs.336,349.5 Rs. (6,082.0 ) Rs.330,267.5 Rs.239,142.5 Rs. (7,443.7 ) Rs.231,698.8 Overdue up to 3 months 62.1 (2.8 ) 59.3 4,294.7 (194.4 ) 4,100.3 4,526.3 (154.5 ) 4,371.8 Overdue more than 3 months 56.9 (29.7 ) 27.2 3,933.2 (2,054.1 ) 1,879.1 7,038.8 (4,119.7 ) 2,919.1 Total US$ 4,982.7 US$ (120.4 ) US$ 4,862.2 Rs.344,577.4 Rs. (8,330.5 ) Rs.336,246.9 Rs.250,707.6 Rs. (11,717.9 ) Rs.238,989.7 * Allowance in the “Not due” category includes allowance against installments pertaining to impaired finance receivables which have not yet fallen due. # Finance receivables originated in India.

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Segment Reporting	For the year ended March 31, 2019 Automotive and related activity Tata and other brand vehicles * Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable** Total (In millions) Revenues: External revenue Rs. 579,496.9 Rs. 141,622.2 Rs. — Rs. 721,119.1 Rs. 33,995.5 Rs. 2,216,656.9 Rs. — Rs. 2,971,771.5 Rs. 21,890.9 Rs. — Rs. 2,993,662.4 US$ 43,289.2 Inter-segment/intra-segment revenue Rs. — Rs. 26.8 Rs. — Rs. 26.8 Rs. 1,129.5 Rs. — Rs. (1,156.3 ) Rs. — Rs. 13,432.8 Rs. (13,432.8 ) Rs. — US$ — Total revenues Rs. 579,496.9 Rs. 141,649.0 Rs. — Rs. 721,145.9 Rs. 35,125.0 Rs. 2,216,656.9 Rs. (1,156.3 ) Rs. 2,971,771.5 Rs. 35,323.7 Rs. (13,432.8 ) Rs. 2,993,662.4 US$ 43,289.2 Earnings Before Other Income, Interest and Tax (a) Rs. 34,007.1 Rs. (15,842.3 ) Rs. (4,761.8 ) 13,403.0 21,153.3 (323,812.6 ) — (289,256.3 ) 4,103.6 (1,201.8 ) (286,354.5 ) (4,140.8 ) Finance costs pertaining to borrowings sourced by vehicle financing segment (26,156.5 ) (26,156.5 ) (26,156.5 ) (378.2 ) Segment results 34,007.1 (15,842.3 ) (4,761.8 ) 13,403.0 (5,003.2 ) (323,812.6 ) — (315,412.8 ) 4,103.6 (1,201.8 ) (312,511.0 ) (4,519.0 ) Share of profit/(loss) of equity accounted investees (net) — — 416.7 416.7 (7.2 ) 753.7 — 1,163.2 931.8 — 2,095.0 30.3 Reconciliation to net income/(loss): Assets written off/loss on sale of assets and others (net) (13,186.7 ) (190.7 ) Other income/(loss) (net) 35,438.7 512.5 Foreign exchange gain/(loss) (net) (5,824.2 ) (84.2 ) Interest income 7,864.6 113.7 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (31,429.5 ) (454.4 ) Income tax (expense)/credit 25,425.0 367.7 Net Income/(loss) Rs. (292,128.1 ) US$ (4,224.1 ) Depreciation and amortization Rs. 16,164.1 13,626.0 1,524.3 31,314.4 186.5 Rs. 197,437.4 Rs. — Rs. 228,938.3 Rs. 1,617.1 Rs. (357.6 ) Rs. 230,197.8 US$ 3,328.7 Capital expenditure Rs. 20,100.8 29,331.7 763.5 50,196.0 719.6 Rs. 290,656.3 — 341,571.9 664.5 — 342,236.4 4,948.8 906.1 Segment assets Rs. 237,225.5 Rs. 176,558.2 Rs. 15,037.0 Rs. 428,820.7 Rs. 382,615.8 Rs. 1,670,913.0 Rs. — Rs. 2,482,349.5 Rs. 20,037.4 Rs. (12,252.5 ) Rs. 2,490,134.4 US$ 36,008.0 Assets classified as held for sale 1,622.4 — — 1,622.4 — — 1,622.4 — — 1,622.4 23.5 Investment in equity accounted investees — — 4,225.5 4,225.5 26.6 43,181.7 — 47,433.8 5,915.0 — 53,348.8 771.4 Reconciliation to total assets: Investments 104,358.4 1,509.1 Current and non-current 12,089.3 174.9 Deferred income taxes 51,511.1 744.9 Other unallocated financial assets 1 274,055.5 3,963.0 Total assets Rs. 2,987,119.9 US$ 43,194.8 Segment liabilities Rs. 157,447.7 Rs. 36,347.5 Rs. 17,521.3 Rs. 211,316.5 Rs. 7,114.3 Rs. 1,039,660.5 Rs. (3,376.5 ) Rs. 1,254,714.8 Rs. 5,290.7 Rs. (2,520.6 ) Rs. 1,257,484.9 US$ 18,183.6 Reconciliation to total liabilities: Borrowings 1,059,910.7 15,326.6 Current income tax liabilities 10,176.4 147.2 Deferred income taxes 14,910.4 215.6 Other unallocated financial liabilities 2 86,570.1 1,251.9 Total liabilities Rs. 2,429,052.5 US$ 35,124.9 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable. 1. Includes interest-bearing loans and deposits and accrued interest income. 2. Includes interest accrued and other interest bearing liabilities. a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense. For the year ended/as at March 31, 2018 Automotive and related activity Tata and other brand vehicles * Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable ** Total (In millions) Revenues: External revenue Rs. 494,917.2 Rs. 128,840.3 Rs. 96.3 Rs. 623,853.8 Rs. 26,040.3 Rs. 2,214,492.3 Rs. — Rs. 2,864,386.4 Rs. 18,564.7 Rs. — Rs. 2,882,951.1 Inter-segment/intra-segment revenue — 77.9 — 77.9 111.9 — (111.9 ) 77.9 12,770.0 (12,847.9 ) — Total revenues Rs. 494,917.2 Rs. 128,918.2 Rs. 96.3 Rs. 623,931.7 Rs. 26,152.2 Rs. 2,214,492.3 Rs. (111.9 ) Rs. 2,864,464.3 Rs. 31,334.7 Rs. (12,847.9 ) Rs. 2,882,951.1 Earnings Before Other Income, Interest and Tax (a) 36,694.4 (29,998.8 ) (4,082.1 ) 2,613.5 17,079.3 84,952.3 — 104,645.1 3,045.8 (1,456.3 ) 106,234.6 Finance costs pertaining to borrowings sourced by vehicle financing segment (19,053.0 ) (19,053.0 ) (19,053.0 ) Segment results 36,694.4 (29,998.8 ) (4,082.1 ) 2,613.5 (1,973.7 ) 84,952.3 — 85,592.1 3,045.8 (1,456.3 ) 87,181.6 Share of profit/(loss) of equity accounted investees — — 301.8 301.8 — 21,389.2 — 21,691.0 1,091.6 — 22,782.6 Reconciliation to net income: Assets written off/loss on sale of assets and others (net) (29,148.6 ) Other income/(loss) (net) 47,873.3 Foreign exchange gain/(loss) (net) (4,332.9 ) Interest income 7,122.4 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (27,738.3 ) Income tax expense (37,678.2 ) Net Income Rs. 66,061.9 Depreciation and amortization Rs. 15,417.3 Rs. 14,368.1 Rs. 1,457.4 Rs. 31,242.8 Rs. 183.4 Rs. 177,830.8 Rs. — Rs. 209,257.0 Rs. 561.2 Rs. — Rs. 209,818.2 Capital expenditure Rs. 13,554.5 Rs. 19,145.1 Rs. 859.8 Rs. 33,559.4 Rs. 471.5 Rs. 380,417.9 Rs. — Rs. 414,448.8 Rs. 841.6 Rs. (187.8 ) Rs. 415,102.6 Segment assets Rs. 206,937.3 Rs. 136,472.5 Rs. 63,355.4 Rs. 406,765.2 Rs. 276,709.4 Rs. 1,967,993.9 Rs. (6.0 ) Rs. 2,651,462.5 Rs. 3,303.8 Rs. (12,031.4 ) Rs. 2,642,734.9 Assets classified as held for sale 2,233.3 — — 2,233.3 — — 2,233.3 27,569.1 (3,950.5 ) 25,851.9 Investment in equity accounted investees — — 3,855.0 3,855.0 — 45,023.9 — 48,878.9 — — 48,878.9 Investment in equity accounted investees (held for sale) — — — — — — — — 4,973.5 — 4,973.5 Reconciliation to total assets: Investments 154,214.0 Current and non-current 11,086.4 Deferred income taxes 41,064.6 Other unallocated financial assets 1 306,706.5 Total assets Rs. 3,235,510.7 Segment liabilities Rs. 135,371.8 Rs. 31,371.7 Rs. 27,198.3 Rs. 193,941.8 Rs. 7,244.0 Rs. 1,048,546.1 Rs. (7.1 ) Rs. 1,249,724.8 Rs. 840.2 Rs. (3,152.2 ) Rs. 1,247,412.8 Liabilities classified as held for sale — — — — — — — — 10,701.8 — 10,701.8 Reconciliation to total liabilities: Borrowings 888,706.8 Current income tax liabilities 15,590.7 Deferred income taxes 61,257.8 Other unallocated financial liabilities 2 98,320.0 Total liabilities Rs. 2,321,989.9 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable 1. Includes interest-bearing loans and deposits and accrued interest income. 2. Includes interest accrued and other interest bearing liabilities. a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense. For the year ended March 31, 2017 Automotive and related activity Tata and other brand vehicles* Vehicle Jaguar Land Intra- Total Others Inter- Total Commercial Passenger Unallocable *** Total (In millions) Revenues: External revenue Rs. 414,891.9 Rs. 79,188.1 Rs. — Rs. 494,080.0 Rs. 24,318.3 Rs. 2,120,676.6 Rs. — Rs. 2,639,074.9 Rs. 17,420.2 Rs. — Rs. 2,656,495.1 Inter-segment/intra-segment revenue — 33.1 — 33.1 238.0 — (284.7 ) (13.6 ) 13,734.0 (13,720.4 ) — Total revenues Rs. 414,891.9 Rs. 79,221.2 Rs. — Rs. 494,113.1 Rs. 24,556.3 Rs. 2,120,676.6 Rs. (284.7 ) Rs. 2,639,061.3 Rs. 31,154.2 Rs. (13,720.4 ) Rs. 2,656,495.1 Earnings Before Other Income, Interest and Tax (a) (1,781.7 ) (28,453.7 ) (4,635.8 ) (34,871.2 ) 16,962.2 120,866.8 ** — 102,957.8 3,797.7 (1,942.8 ) 104,812.7 Finance costs pertaining to borrowings sourced by vehicle financing segment (18,465.0 ) (18,465.0 ) (18,465.0 ) Segment results (1,781.7 ) (28,453.7 ) (4,635.8 ) (34,871.2 ) (1,502.8 ) 120,866.8 — 84,492.8 3,797.7 (1,942.8 ) 86,347.7 Share of profit/(loss) of equity accounted investees (net) — — 252.1 252.1 — 13,843.7 — 14,095.8 834.2 — 14,930.0 Reconciliation to net income: Assets written off/loss on sale of assets and others (net) (11,418.6 ) Other income /(loss) (net) 39,590.1 Foreign exchange gain/(loss) (net) (16,590.4 ) Interest income 5,640.7 Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment) (23,900.7 ) Income tax expense (35,035.6 ) Net Income Rs. 59,563.2 Depreciation and amortization Rs. 19,333.6 Rs. 15,666.5 Rs. 1,400.9 Rs. 36,401.0 Rs. 275.3 Rs. 144,472.0 Rs. — Rs. 181,148.3 Rs. 1,257.1 Rs. — Rs. 182,405.4 Capital expenditure 16,562.0 22,506.6 912.2 39,980.8 76.1 269,658.7 — 309,715.6 3,652.3 (1,740.6 ) 311,627.3 * Tata and other brand vehicles include Tata Daewoo and Fiat brand vehicles. ** Includes reversal of provision for loss of inventories and insurance recoveries on account of loss of inventories Rs. 13,301.0 million *** Corporate expenses for Tata Motors Limited not identifiable to reportable segments kept as unallocable a. Earnings Before Other Income, Interest and Tax is Earnings before share of profit/(loss) of equity accounted investees (net), assets written off/loss on sale of assets and others (net), other income/(loss) (net), foreign exchange gains/(loss) (net), interest income, interest expense (net) and income tax expense.
Summary of Information Concerning Principal Geographic Areas	Net sales to external customers by geographic area by location of customers: Year ended March 31, 2019 2019 2018 2017 (In millions) India US$ 9,806.2 Rs. 678,148.1 Rs. 578,403.3 Rs. 422,499.1 United States of America 7,411.0 512,511.1 448,881.5 413,469.9 United Kingdom 8,097.7 559,993.0 418,970.3 486,091.5 Rest of Europe 6,537.3 452,087.8 470,288.0 469,926.9 China 4,394.9 303,929.1 481,675.0 410,721.9 Rest of the World 7,042.1 486,993.3 484,733.0 453,785.8 Total revenues US$ 43,289.2 Rs. 2,993,662.4 Rs. 2,882,951.1 Rs. 2,656,495.1 Non-current non-current As at March 31, 2019 2019 2018 (In millions) India US$ 3,596.6 Rs. 248,726.3 Rs. 224,623.2 United States of America 42.2 2,919.9 2,990.0 United Kingdom 14,186.4 981,062.7 1,211,921.5 Rest of Europe 1,369.5 94,708.0 72,420.6 China 20.4 1,409.2 1,661.1 Rest of the World 363.5 25,137.5 26,977.3 Total US$ 19,578.6 Rs. 1,353,963.6 Rs. 1,540,593.7
Summary of Information About Product Revenues	Information about product revenues: Year ended March 31, 2019 2019 2018 2017 (In millions) Tata and Fiat vehicles US$ 9,863.0 Rs. 682,076.2 Rs. 575,483.5 Rs. 436,306.2 Tata Daewoo commercial vehicles 564.6 39,042.9 48,370.3 57,773.8 Jaguar Land Rover vehicles 32,053.5 2,216,656.9 2,214,492.3 2,120,676.6 Others 316.5 21,890.9 18,564.7 17,420.2 Sub-total 42,797.6 2,959,666.9 2,856,910.8 2,632,176.8 Finance revenues 491.6 33,995.5 26,040.3 24,318.3 Total revenues US$ 43,289.2 Rs. 2,993,662.4 Rs. 2,882,951.1 Rs. 2,656,495.1

Related-party transactions (Tab

Related-party transactions (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Related-party Transactions and Balances Included in Consolidated Financial Statements	The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2019: Associates subsidiaries Joint ventures Joint operations Tata Sons Pvt Ltd, its subsidiaries and Total Total (In millions) Purchase of products Rs. 23,691.0 Rs. 24.6 Rs. 39,407.7 Rs. 2,028.0 Rs. 65,151.3 US$ 942.1 Sale of products 3,284.0 29,465.5 8,253.2 8,281.0 49,283.7 712.7 Services received 462.0 11.3 — 18,668.0 19,141.3 276.8 Services rendered 217.0 7,653.2 60.4 1,163.0 9,093.6 131.5 Acceptances — — — 54,937.8 54,937.8 794.4 Purchase of property, plant and equipment 135.0 — — 8.0 143.0 2.1 Purchase of investments 72.0 — — — 72.0 1.0 Sale of investments — — — 5,333.5 5,333.5 77.1 Interest (income)/expense, dividend (income)/paid, (net) (124.0 ) (1,991.3 ) (262.2 ) 231.0 (2,146.5 ) (31.0 ) Loans given — 57.5 — — 57.5 0.8 Loans taken 1,770.0 — — — 1,770.0 25.6 Loans repaid by us 2,100.0 — — — 2,100.0 30.4 Amounts receivable in respect of loans and interest thereon — 37.5 — 38.0 75.5 1.1 Amounts payable in respect of loans and interest thereon 230.0 — — 36.0 266.0 3.8 Trade and other receivables 556.0 1,321.5 — 1,988.0 3,865.5 55.9 Accounts payable 3,043.0 25.9 2,461.2 3,729.0 9,259.1 133.9 Acceptances — — — 691.3 691.3 10.0 The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2018: Associates Joint Joint Tata Sons Total (In millions) Purchase of products Rs. 26,057.0 Rs. — Rs. 31,631.0 Rs. 1,713.0 Rs. 59,401.0 Sale of products 2,016.0 60,082.1 5,454.9 7,091.0 74,644.0 Services received 89.0 5,500.9 1.6 17,353.0 22,944.5 Services rendered 190.0 12,077.2 43.4 241.0 12,551.6 Acceptances — — — 41,350.3 41,350.3 Purchase of property, plant and equipment 624.0 — — 2.0 626.0 Purchase of investments — 25.0 — — 25.0 Interest (income)/expense, dividend (income)/paid, (net) (95.0 ) (17,644.9 ) (46.0 ) 263.0 (17,522.9 ) Loans taken 4,890.0 — — — 4,890.0 Loans repaid by us 4,890.0 — — — 4,890.0 Amounts receivable in respect of loans and interest thereon — — — 40.0 40.0 Amounts payable in respect of loans and interest thereon 560.0 — — 48.0 608.0 Trade and other receivables 633.0 10,371.4 (0.7 ) 1,511.0 12,514.7 Accounts payable 1,496.0 2.5 1,848.8 3,357.0 6,704.3 Acceptances — — — 2,201.6 2,201.6 Deposit given as security — — — 30.0 30.0 The following table summarizes related-party transactions and balances included in the consolidated financial statements for the year ended/as at March 31, 2017: Associates Joint ventures Joint operations Tata Sons Total (In millions) Purchase of products Rs. 20,585.2 Rs. 213.0 Rs. 22,757.5 Rs. 668.4 Rs. 44,224.1 Sale of products 2,504.9 49,835.3 3,237.2 4,615.0 60,192.4 Services received 109.8 10,885.7 0.7 19,701.5 30,697.7 Services rendered 166.4 7,718.8 161.2 1,301.3 9,347.7 Acceptances — — — 32,027.7 32,027.7 Purchase of property, plant and equipment 137.9 — — 1.1 139.0 Interest (income)/expense, dividend (income)/paid, (net) (111.0 ) (5,943.6 ) (121.2 ) 642.6 (5,533.2 ) Amounts receivable in respect of loans and interest thereon — — — 93.3 93.3 Amounts payable in respect of loans and interest thereon 560.0 — — 1,055.5 1,615.5 Trade and other receivables 495.2 5,658.6 — 1,600.1 7,753.9 Accounts payable 397.6 226.3 1,239.6 4,711.1 6,574.6 Conversion of Optionally Convertible Preference shares in to equity shares 1,600.0 — — — 1,600.0 Loans given — — — 303.0 303.0 Loans given, repaid — — 1,325.0 603.0 1,928.0 Loans taken 3,290.0 — — 5,896.3 9,186.3 Loans repaid by us 3,000.0 — — 6,269.5 9,269.5 Deposit given as security — — — 30.0 30.0
Summary of Compensation and Other Transactions with Key Management Personnel	Compensation of key management personnel: Year ended March 31, 2019 2019 2018 2017 (In millions) Short-term benefits US$ 9.2 Rs. 633.9 Rs. 798.4 Rs. 693.1 Post-employment benefits* 0.8 54.6 17.6 184.7 Share based payment US$ 0.1 Rs. 4.4 Rs. — Rs. — * Excludes provision for encashable leave and gratuity for certain key management personnel as a separate actuarial valuation is not available. Other transactions with key management personnel: Year ended March 31, 2019 2019 2018 2017 (In millions) Sale of products US$ — Rs. — Rs. — Rs. 8.1 Dividend paid US$ — Rs. — Rs. — Rs. — ** Refer note 35 for information on transactions with post-employment benefit plans. ** amount less than Rs. 50,000

Earnings per share ("EPS") (Tab

Earnings per share ("EPS") (Tables)	12 Months Ended
	Mar. 31, 2019
Text block [abstract]
Summary of Earnings Per Share	Net income Weighted Earnings per For the year ended March 31, 2019: Ordinary Shares Basic net earnings per share Rs. (249,246.9 ) 2,887,348,474 Rs. (86.3 ) US$ (3,604.2 ) US$ (1.2 ) Effect of shares kept in abeyance Rs. # # Rs. # US$ # # US$ # Diluted earnings per share Rs. (249,246.9 ) 2,887,348,474 Rs. (86.3 ) US$ (3,604.2 ) US$ (1.2 ) ‘A’ Ordinary Shares Basic net earnings per share Rs. (43,895.8 ) 508,502,371 Rs. (86.3 ) US$ (634.7 ) US$ (1.2 ) Effect of shares kept in abeyance Rs. # # Rs. # US$ # # US$ # Diluted earnings per share Rs. (43,895.8 ) 508,502,371 Rs. (86.3 ) US$ (634.7 ) US$ (1.2 ) For the year ended March 31, 2018: Ordinary Shares Basic net earnings per share Rs. 55,258.1 2,887,348,357 Rs. 19.1 Effect of shares kept in abeyance Rs. (2.4 ) 494,469 Rs. (4.9 ) Diluted earnings per share Rs. 55,255.7 2,887,842,826 Rs. 19.1 ‘A’ Ordinary Shares Basic net earnings per share Rs. 9,782.6 508,502,336 Rs. 19.2 Effect of shares kept in abeyance Rs. 2.4 233,774 Rs. 10.3 Diluted earnings per share Rs. 9,785.0 508,736,110 Rs. 19.2 For the year ended March 31, 2017: Ordinary Shares Basic net earnings per share Rs. 49,730.2 2,887,218,310 Rs. 17.2 Effect of shares kept in abeyance Rs. (2.2 ) 599,766 Rs. (3.7 ) Diluted earnings per share Rs. 49,728.0 2,887,818,076 Rs. 17.2 ‘A’ Ordinary Shares Basic net earnings per share Rs. 8,809.1 508,483,714 Rs. 17.3 Effect of shares kept in abeyance Rs. 2.2 252,396 Rs. 8.7 Diluted earnings per share Rs. 8,811.3 508,736,110 Rs. 17.3

Held for sale assets and liab_2

Held for sale assets and liabilities (Tables)	12 Months Ended
	Mar. 31, 2019
Investments accounted for using equity method [abstract]
Disclosure of Detailed Information About Assets and Liabilities Held for Sale	The below table outlines various assets and liabilities classifed as held for sale. As at March 31, 2019 2019 2018 (In millions) ASSETS: Current assets: Cash and cash equivalents US$ — Rs. — Rs. 2,439.4 Short-term deposits — — 201.2 Trade receivables — — 5,245.8 Other financial assets — — 319.0 Inventories — — 958.0 Other current assets — — 584.6 Current income tax assets — — 726.4 Total current assets — — 10,474.5 Non-current Investments — — 317.9 Other financial assets — — 546.9 Property, plant and equipment 0.2 11.4 4,545.3 Goodwill — — 5,579.1 Intangible assets 23.3 1,611.0 3,076.1 Non-current — — 318.4 Deferred income taxes — — 211.6 Other non-current — — 782.1 Total non-current 23.5 1,622.4 15,377.4 Total assets US$ 23.5 Rs. 1,622.4 Rs. 25,851.9 LIABILITIES Current liabilities: Accounts payable — — 3,926.4 Short-term borrowings and current portion of long-term debt — — 939.0 Other financial liabilities — — 67.0 Provisions — — 117.1 Other current liabilities — — 1,844.1 Current income tax liabilities — — 714.3 Total current liabilities — — 7,607.9 Non-current Long-term debt — — 486.5 Other financial liabilities — — 13.4 Provisions — — 297.0 Other liabilities — — 2,296.9 Total non-current — — 3,093.9 Total liabilities US$ — Rs. — Rs. 10,701.8

Subsidiaries (Tables)

Subsidiaries (Tables)	12 Months Ended
	Mar. 31, 2019
Investments accounted for using equity method [abstract]
Disclosure of Detailed Information of Percentage of Control in Subsidiaries	Sr. No. Name of the Subsidiary Company Country of % of Equity 1 Concorde Motors (India) Limited India 100.00 2 Tata Motors European Technical Centre PLC UK 100.00 3 Tata Motors Insurance Broking and Advisory Services Limited India 100.00 4 TMF Holdings Limited (formerly known as Tata Motors Finance Limited) India 100.00 5 TML Holdings Pte. Limited Singapore 100.00 6 TML Distribution Company Limited India 100.00 7 Tata Hispano Motors Carrocera S.A. Spain 100.00 8 Tata Hispano Motors Carrocerries Maghreb SA Morocco 100.00 9 Trilix S.r.l. Italy 100.00 10 Tata Precision Industries Pte. Limited Singapore 78.39 11 Tata Technologies Limited India 72.28 12 Tata Marcopolo Motors Limited India 51.00 (B) INDIRECT SUBSIDIARIES (i) Subsidiaries of TML Holdings Pte. Ltd. 13 Tata Daewoo Commercial Vehicle Company Limited South Korea 100.00 14 Tata Daewoo Commercial Vehicle Sales and Distribution Company Limited South Korea 100.00 15 Tata Motors (Thailand) Limited Thailand 95.49 16 Tata Motors (SA) (Proprietary) Limited South Africa 60.00 17 PT Tata Motors Indonesia Indonesia 100.00 18 PT Tata Motors Distribusi Indonesia Indonesia 100.00 19 TMNL Motor Services Nigeria Limited Nigeria 100.00 20 Jaguar Land Rover Automotive Plc UK 100.00 (ii) Subsidiaries of Jaguar Land Rover Automotive Plc 21 Jaguar Land Rover Holdings Limited UK 100.00 (iii) Subsidiaries of Jaguar Land Rover Holdings Limited 22 Jaguar Land Rover Limited UK 100.00 23 Jaguar Land Rover Austria GmbH Austria 100.00 24 Jaguar Land Rover Japan Limited Japan 100.00 25 JLR Nominee Company Limited UK 100.00 26 Jaguar Land Rover Deutschland GmbH Germany 100.00 27 Jaguar Land Rover North America LLC USA 100.00 28 Jaguar Land Rover Nederland BV Netherlands 100.00 29 Jaguar Land Rover Portugal - Veículos e Peças, Lda. Portugal 100.00 30 Jaguar Land Rover Australia Pty Limited Australia 100.00 31 Jaguar Land Rover Italia Spa Italy 100.00 32 Jaguar Land Rover Korea Company Limited South Korea 100.00 33 Jaguar Land Rover (China) Investment Co. Limited China 100.00 34 Jaguar Land Rover Canada ULC Canada 100.00 35 Jaguar Land Rover France, SAS France 100.00 36 Jaguar Land Rover (South Africa) (Pty) Limited South Africa 100.00 37 Jaguar e Land Rover Brasil Indústria e Comércio de Veículos LTDA Brazil 100.00 38 Limited Liability Company “Jaguar Land Rover” (Russia) Russia 100.00 39 Jaguar Land Rover (South Africa) Holdings Limited South Africa 100.00 40 Jaguar Land Rover India Limited India 100.00 41 Jaguar Land Rover Espana SL Spain 100.00 42 Jaguar Land Rover Belux NV Belgium 100.00 43 Jaguar Cars South Africa (Pty) Limited South Africa 100.00 44 The Jaguar Collection Limited UK 100.00 45 Jaguar Cars Limited UK 100.00 46 Land Rover Exports Limited UK 100.00 47 Land Rover Ireland Limited Ireland 100.00 48 The Daimler Motor Company Limited UK 100.00 49 Daimler Transport Vehicles Limited UK 100.00 50 S.S. Cars Limited UK 100.00 51 The Lanchester Motor Company Limited UK 100.00 52 Shanghai Jaguar Land Rover Automotive Services Company Limited China 100.00 53 Jaguar Land Rover Pension Trustees Limited UK 100.00 54 Jaguar Land Rover Slovakia s.r.o Slovakia 100.00 55 Jaguar Land Rover Singapore Pte. Ltd. Singapore 100.00 56 Jaguar Racing Limited UK 100.00 57 InMotion Ventures Limited UK 100.00 58 InMotion Ventures 1 Limited UK 100.00 59 InMotion Ventures 2 Limited UK 100.00 60 InMotion Ventures 3 Limited UK 100.00 61 InMotion Ventures 4 Limited UK 100.00 62 Jaguar Land Rover Colombia S.A.S Columbia 100.00 63 Jaguar Land Rover Ireland (Services) Limited Ireland 100.00 64 Jaguar Land Rover Taiwan Company Limited Taiwan 100.00 65 Jaguar Land Rover Servicios México, S.A. de C.V. Mexico 100.00 66 Jaguar Land Rover México, S.A.P.I. de C.V. Mexico 100.00 67 Jaguar Land Rover Hungary KFT Hungary 100.00 68 Jaguar Land Rover Classic USA LLC USA 100.00 69 Spark44 (JV) Limited UK 50.50 (iv) Subsidiaries of Spark44 (JV) Limited 70 Spark44 Pty. Ltd. Australia 50.50 71 Spark44 GmbH Germany 50.50 72 Spark44 LLC USA 50.50 73 Spark44 Shanghai Limited China 50.50 74 Spark44 DMCC UAE 50.50 75 Spark44 Demand Creation Partners Pvt. Limited India 50.50 76 Spark44 Limited UK 50.50 77 Spark44 Singapore Pte. Ltd. Singapore 50.50 78 Spark44 Communications SL Spain 50.50 79 Spark44 S.r.l. Italy 50.50 80 Spark44 Seoul Limited Korea 50.50 81 Spark44 Japan K.K. Japan 50.50 82 Spark44 Canada Inc Canada 50.50 83 Spark44 Pty. Limited South Africa 50.50 84 Spark44 Colombia S.A.S. Columbia 50.50 85 Spark44 Taiwan Limited Taiwan 50.50 (v) Subsidiaries of Tata Technologies Limited 86 Tata Technologies Pte Limited Singapore 72.28 87 Tata Technologies (Thailand) Limited Thailand 72.28 88 Tata Manufacturing Technologies (Shanghai) Limited China 72.28 89 INCAT International Plc. UK 72.28 90 INCAT GmbH Germany 72.28 91 Tata Technologies Europe Limited UK 72.28 92 Escenda Engineering AB Sweden 72.28 93 Tata Technologies Inc. USA 72.35 94 Tata Technologies de Mexico, S.A. de C.V. Mexico 72.35 95 Cambric GmbH Germany 72.35 96 Cambric Limited USA 72.32 97 Tata Technologies SRL Romania Romania 72.32 (vi) Subsidiaries of TMF Holdings Ltd. 98 Tata Motors Finance Solutions Limited India 100.00 99 Tata Motors Finance Limited India 100.00

Background and Operations - Add

Background and Operations - Additional Information (Detail) - Tata Sons Private Limited [Member]	12 Months Ended
	Mar. 31, 2019
Ordinary shares [Member]
Disclosure of background and operations [line items]
Percentage of shares of Tata Motors Limited owned by Tata Sons Limited	38.52%
'A' Ordinary shares [Member]
Disclosure of background and operations [line items]
Percentage of shares of Tata Motors Limited owned by Tata Sons Limited	0.09%

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail) $ in Millions	Mar. 31, 2019INR (₨)	Apr. 01, 2018INR (₨)	Mar. 31, 2019INR (₨)Segments	Mar. 31, 2019USD ($)Segments	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of summary of significant accounting policies [line items]
Assets written off/loss on sale of assets and others (net)			₨ 13,186,700,000	$ 190.7	₨ 29,148,600,000	₨ 11,418,600,000
Amount available for distribution	₨ 0		₨ 0
Number of reportable sub-segments | Segments			4	4
Decrease in retained earnings		₨ (177,800,000)
Decrease in both revenue and expenses			₨ 45,926,900,000
Contract liabilities	(92,504,700,000)		(92,504,700,000)		(78,678,900,000)
Operating lease liability	58,497,700,000		58,497,700,000
Right to use assets	56,536,300,000		₨ 56,536,300,000
Decrease in retained earnings from adoption of IFRS 16	₨ (1,961,400,000)
Convenience translation, rate of INR per US$1.00	69.155		69.155
Bottom of range [member]
Disclosure of summary of significant accounting policies [line items]
Percentage of voting power held in associates			20.00%	20.00%
Top of range [member]
Disclosure of summary of significant accounting policies [line items]
Percentage of voting power held in associates			50.00%	50.00%
Product warranty claim, timing of outflow period			6 years	6 years
Leasing arrangement, timing of outflow period			3 years	3 years
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Disclosure of summary of significant accounting policies [line items]
Number of days salary payable for lump sum payment			30 days	30 days
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] | Bottom of range [member]
Disclosure of summary of significant accounting policies [line items]
Number of years of employment eligible for lump sum payment			1 year	1 year
Provident Fund and Family Pension [Member]
Disclosure of summary of significant accounting policies [line items]
Percentage of the covered employees' salary contributed to defined contribution plan			12.00%	12.00%
Increase (decrease) due to application of IFRS 15 [member]
Disclosure of summary of significant accounting policies [line items]
Retained earnings					418,000,000
Warranty provision					1,376,500,000
Contract liabilities					₨ 1,794,500,000
Gratuity benefits [Member] | Bottom of range [member]
Disclosure of summary of significant accounting policies [line items]
Number of days of salary payable related to gratuity plan			15 days	15 days
Vesting period related to gratuity plan			5 years	5 years
Gratuity benefits [Member] | Top of range [member]
Disclosure of summary of significant accounting policies [line items]
Number of days of salary payable related to gratuity plan			30 days	30 days
Superannuation plan [member] | Bottom of range [member]
Disclosure of summary of significant accounting policies [line items]
Percentage of annual basic salary for monthly pension benefits after retirement			0.75%	0.75%
Superannuation plan [member] | Top of range [member]
Disclosure of summary of significant accounting policies [line items]
Percentage of annual basic salary for monthly pension benefits after retirement			2.00%	2.00%
Maximum percentage of salary entitled to benefits			15.00%	15.00%
Maximum percentage of employees salary contributed to plan			15.00%	15.00%
Maximum amount of employees salary contributed to plan			₨ 150,000
Bhavishya Kalyan Yojana [Member]
Disclosure of summary of significant accounting policies [line items]
Percentage of salary drawn eligible for monthly payments			50.00%	50.00%
Product development costs [Member] | Bottom of range [member]
Disclosure of summary of significant accounting policies [line items]
Product development cost, amortization period			24 months	24 months
Product development costs [Member] | Top of range [member]
Disclosure of summary of significant accounting policies [line items]
Product development cost, amortization period			120 months	120 months

Significant Accounting Polici_5

Significant Accounting Policies - Summary of Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Mar. 31, 2019
Buildings [Member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	20 years
Buildings [Member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	60 years
Plant and equipment [Member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	3 years
Plant and equipment [Member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	30 years
Computers [Member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	3 years
Computers [Member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	6 years
Vehicles [Member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	3 years
Vehicles [Member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	11 years
Furniture and fixtures [Member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	3 years
Furniture and fixtures [Member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of assets	21 years

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Estimated Useful Lives of Intangible Assets (Detail)	12 Months Ended
	Mar. 31, 2019
Patents and technical know-how [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	2 years
Patents and technical know-how [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	12 years
Dealer network [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	20 years
Intellectual property rights [Member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	3 years
Intellectual property rights [Member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	10 years
Software [Member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	1 years
Software [Member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives of intangible assets	8 years

Significant Accounting Polici_7

Significant Accounting Policies - Adjustments Made to Line Items in the Income Statement and the Statement of Other Comprehensive Income and Cumulative Effect Recognized in Effect Equity for Changes in Accounting on Adoption of IFRS 9 (Detail) ₨ in Millions, $ in Millions	Apr. 01, 2018INR (₨)	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance	₨ (39,224)	₨ (39,224)		₨ (206,143.3)
Beginning Balance	(4,473.1)	(4,473.1)		(6,704.6)
Available for sale investments measured now as Fair value through profit or loss				1,561.7	₨ 1,826
Foreign exchange (gain)/loss (net)		(5,824.2)	$ (84.2)	(4,332.9)	(16,590.4)
Gain/(loss) on cash flow hedges (net)		(28,142.8)	(407)	208,629.8	(154,141.7)
Interest (expense) (net)		(57,586)	(832.7)	(46,791.3)	(42,365.7)
Income tax (expense)/credit		25,425	367.7	(37,678.2)	(35,035.6)
Ending Balance		(60,668.2)	(877.2)	(39,224)	(206,143.3)
Ending Balance		(2,873.9)	$ (41.6)	(4,473.1)	(6,704.6)
Cost of Hedge Reserve [member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance	(4,473.1)	(4,473.1)		(6,704.6)	(3,140.5)
Basis adjustment for hedges of inventory purchases	204.8
Foreign exchange (gain)/loss (net)				1,574.1	3,305.6
Gain/(loss) on cash flow hedges (net)				1,233	(7,679.7)
Income tax (expense)/credit				(575.6)	810
Ending Balance	(4,268.3)			(4,473.1)	(6,704.6)
Hedge reserve [member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance	5,857.1	5,857.1		6,894.8	659.5
Basis adjustment for hedges of inventory purchases	(2,819.3)
Gain/(loss) on cash flow hedges (net)				(1,233)	7,679.7
Income tax (expense)/credit				195.3	(1,444.4)
Ending Balance	3,037.8			5,857.1	6,894.8
Retained earnings [Member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance	(1,810.3)	₨ (1,810.3)		(190.2)	2,481
Expected credit loss	(177.8)
Available for sale investments measured now as Fair value through profit or loss	29.3
Foreign exchange (gain)/loss (net)				(1,574.1)	(3,305.6)
Interest (expense) (net)				(426.3)
Income tax (expense)/credit				380.3	634.4
Ending Balance	₨ (1,958.8)			₨ (1,810.3)	(190.2)
Cumulative increase (decrease) due to application of IFRS 9 [Member] | Cost of Hedge Reserve [member] | Time value of options [member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance					(2,481)
Cumulative increase (decrease) due to application of IFRS 9 [Member] | Cost of Hedge Reserve [member] | Cross Currency Basis Spread Adjustment [member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance					(659.5)
Cumulative increase (decrease) due to application of IFRS 9 [Member] | Hedge reserve [member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance					659.5
Cumulative increase (decrease) due to application of IFRS 9 [Member] | Retained earnings [Member]
Disclosure of initial application of standards or interpretations [line items]
Beginning Balance					₨ 2,481

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2018USD ($)	Mar. 31, 2017INR (₨)	Mar. 31, 2016INR (₨)
Cash and cash equivalents [abstract]
Cash balances	₨ 292.1	$ 4.2	₨ 314.2
Balances with banks (including deposits with original maturity of up to three months)	215,305.9	3,113.4	146,853.3
Total	₨ 215,598	$ 3,117.6	₨ 147,167.5	$ 2,128.1	₨ 139,867.6	₨ 171,536.1

Finance Receivables - Summary o

Finance Receivables - Summary of Finance Receivables (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of financial assets [line items]
Finance receivables	₨ 336,246.9	$ 4,862.2	₨ 238,989.7
Current portion	115,515.2	1,670.4	84,016.5
Non-current portion	220,731.7	3,191.8	154,973.2
Cost [Member]
Disclosure of financial assets [line items]
Finance receivables	344,577.4	4,982.7	250,707.6
Allowance for credit losses [Member]
Disclosure of financial assets [line items]
Finance receivables	₨ 8,330.5	$ 120.5	₨ 11,717.9

Finance Receivables - Summary_2

Finance Receivables - Summary of Changes in Allowance for Credit Losses in Finance Receivables (Detail) - Finance receivables [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of financial assets [line items]
Balance at the beginning	₨ 11,717.9	$ 169.4	₨ 35,975.1	₨ 44,131.9
Effect of IFRS 9 transition	177.8	2.6
Allowances made during the year	3,202.4	46.3	255.2	5,653.5
Written off	(6,767.6)	(97.8)	(24,512.4)	(13,810.3)
Balance at the end	₨ 8,330.5	$ 120.5	₨ 11,717.9	₨ 35,975.1

Allowance for Trade and Other_3

Allowance for Trade and Other Receivables - Summary of Change in Allowances for Trade and Other Receivables (Detail) - Trade and other receivables [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of financial assets [line items]
Balance at the beginning	₨ 14,776.2	$ 213.7	₨ 15,170.3	₨ 14,460.4
Allowances made during the year	2,141.9	31	145.7	1,706
Written off	(3,974.4)	(57.5)	(454.9)	(1,340.3)
Currency translation	(353.3)	(5.1)	45.6	344.2
Reversal of/(classified as) held for sale	130.5	1.9	(130.5)
Balance at the end	₨ 12,720.9	$ 184	₨ 14,776.2	₨ 15,170.3

Other Investments - non-curre_3

Other Investments - non-current - Summary of Other Investments Non current (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Equity shares	₨ 7,412.9	$ 107.2	₨ 4,014.3
Investments - measured at Fair value through profit or loss	7,523.4	109	3,527.2
Investments - measured at amortized cost	38.8	0.6	35
Total (a+b+c)	14,975.1	216.8	7,576.5
IAS 39 Category AFS			369.5
Loans and Receivables			1,094
Unquoted equity investments at Cost			2,036.9
Unquoted equity investments at FVTPL			4,076.1
Quoted equity shares [Member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	4,231.4		2,047
Quoted equity shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Equity shares	3,033.9	43.9	369.5
Investments - measured at Fair value through profit or loss	4,231.4	61.2
Unquoted equity shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Equity shares	4,379	63.3	3,644.8
Investments - measured at Fair value through profit or loss	1,242.8	18	2,468.2
Mutual funds [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	288.4	4.2
Non Cumulative Redeemable Preference shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	54	0.8	4
Cumulative redeemable preference shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	25	0.4	25
Convertible Debentures [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	1,490.8	21.6	854
Unquoted Others [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	191	2.8	176
Non-convertible debentures [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Investments - measured at amortized cost	₨ 38.8	$ 0.6	35
Investments - FVTOCI [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
IAS 39 Category AFS			369.5
Unquoted equity investments at Cost			2,036.9
Unquoted equity investments at FVTPL			1,607.9
Investments - FVTOCI [Member] | Quoted equity shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
IAS 39 Category AFS			369.5
Investments - FVTOCI [Member] | Unquoted equity shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Unquoted equity investments at Cost			2,036.9
Unquoted equity investments at FVTPL			1,607.9
Investments - FVTPL [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			1,059
Unquoted equity investments at FVTPL			2,468.2
Investments - FVTPL [Member] | Unquoted equity shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Unquoted equity investments at FVTPL			2,468.2
Investments - FVTPL [Member] | Non Cumulative Redeemable Preference shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			4
Investments - FVTPL [Member] | Cumulative redeemable preference shares [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			25
Investments - FVTPL [Member] | Convertible Debentures [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			854
Investments - FVTPL [Member] | Unquoted Others [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			176
Financial assets at amortized cost, class [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			35
Financial assets at amortized cost, class [Member] | Non-convertible debentures [Member] | ReclassifyingToIFRS9Category [member]
Disclosure of financial assets [line items]
Loans and Receivables			₨ 35

Other Investments - Additional

Other Investments - Additional Information (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Quoted equity shares [Member]
Disclosure of financial assets [line items]
Carrying value of equity shares	₨ 4,231.4	₨ 2,047

Other Investments - current - S

Other Investments - current - Summary of Other Investments current (Detail) - ReclassifyingToIFRS9Category [member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of financial assets [line items]
Investments - measured at Fair value through Other Comprehensive Income	₨ 9.2	$ 0.1	₨ 3,035.3
Investments - measured at Fair value through profit or loss	11,919	172.4	16,007.5
Investments - measured at amortized cost	77,455.1	1,120	127,594.7
Total (a+b+c)	89,383.3	1,292.5	146,637.5
AFS			146,637.5
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Quoted equity shares [Member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through Other Comprehensive Income	9.2	0.1	3,035.3
Mutual funds [Member]
Disclosure of financial assets [line items]
Investments - measured at Fair value through profit or loss	11,919	172.4	16,007.5
Money market funds [member]
Disclosure of financial assets [line items]
Investments - measured at amortized cost	₨ 77,455.1	$ 1,120	127,594.7
Investments - FVTOCI [Member]
Disclosure of financial assets [line items]
AFS			3,035.3
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Investments - FVTOCI [Member] | Quoted equity shares [Member]
Disclosure of financial assets [line items]
AFS			3,035.3
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Investments - FVTPL [Member]
Disclosure of financial assets [line items]
AFS			16,007.5
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Investments - FVTPL [Member] | Mutual funds [Member]
Disclosure of financial assets [line items]
AFS			16,007.5
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Financial assets at amortized cost, class [Member]
Disclosure of financial assets [line items]
AFS			127,594.7
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			0
Financial assets at amortized cost, class [Member] | Money market funds [member]
Disclosure of financial assets [line items]
AFS			127,594.7
Loans and Receivables			0
Unquoted equity investments at Cost			0
Unquoted equity investments at FVTPL			₨ 0

Other Financial Assets - Curren

Other Financial Assets - Current - Summary of Other Financial Assets - Current (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of financial assets [abstract]
Derivative financial instruments	₨ 12,355.4	$ 178.7	₨ 24,761.3
Loans to channel partners	885.2	12.8	188.4
Advances and other receivables recoverable in cash	26,543	383.8	24,020.8
Inter corporate deposits	23.1	0.3	3.2
Margin money with banks	1,495.8	21.6	417.1
Government grant receivables	5,003.1	72.3	4,114
Restricted bank deposits	3,652.3	52.9	4,938.8
Others	12.8	0.2
Total	₨ 49,970.7	$ 722.6	₨ 58,443.6

Other Financial Assets - Curr_2

Other Financial Assets - Current - Additional Information (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Disclosure of financial assets [line items]
Restricted bank deposits held as security in relation to interest and repayment of borrowings	₨ 2,509.3	₨ 3,030.8
Restricted bank deposits [Member]
Disclosure of financial assets [line items]
Restricted bank deposits pledged till the maturity of the respective borrowings	₨ 942.7	₨ 850.9

Other Financial Assets (Non-cur

Other Financial Assets (Non-current) - Summary of Other Financial Assets (Non-current) (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of financial assets [abstract]
Derivative financial instruments	₨ 9,111.4	$ 131.8	₨ 28,469
Loans to channel partners	1,804.9	26.1	2,787.2
Advance and other receivables recoverable in cash	9,682.3	140	10,728.4
Margin money with banks	3,290.7	47.6	1,048
Government grants receivables	5,080.8	73.5	4,671.4
Loans to employees	262.9	3.8	280.6
Restricted deposits	751.1	10.9	690.6
Loans to joint arrangements	37.5	0.5
Others	2,144.4	30.9	1,917.6
Total	₨ 32,166	$ 465.1	₨ 50,592.8

Other Financial Assets (Non-c_2

Other Financial Assets (Non-current) - Additional Information (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of financial assets [line items]
Restricted deposits held in relation to legal cases	₨ 751.1	$ 10.9	₨ 690.6
Legal cases [Member]
Disclosure of financial assets [line items]
Restricted deposits held in relation to legal cases	₨ 452.6		₨ 507.6

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Classes of current inventories [abstract]
Raw materials, components and consumables	₨ 36,026	$ 520.9	₨ 45,175
Work-in-progress	38,917.6	562.8	40,431.7
Finished goods	315,072.3	4,556	338,689.5
Total	₨ 390,015.9	$ 5,639.7	₨ 424,296.2

Inventories - Additional Inform

Inventories - Additional Information (Detail) ₨ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2018GBP (£)	Mar. 31, 2017INR (₨)	Mar. 31, 2017GBP (£)	Mar. 31, 2016INR (₨)	Mar. 31, 2016GBP (£)	Mar. 31, 2019USD ($)
Disclosure of inventories [line items]
Finished goods	₨ 315,072.3	₨ 338,689.5						$ 4,556
Cost of inventories (including cost of purchased products) recognized as expense	2,283,424.2	2,172,364.1		₨ 1,975,324.2
Inventory write-down expenses	6,086.3	6,074.2		3,725.1
Provision for inventory						₨ 16,383.9	£ 157
Inventory insurance recoveries		111.9	£ 1.4	₨ 13,301	£ 151	₨ 5,342.4	£ 55
Vehicles sold subject to repurchase arrangements [Member]
Disclosure of inventories [line items]
Finished goods	₨ 43,807.1	₨ 40,236.1

Other Current Assets - Summary

Other Current Assets - Summary of Other Current Assets (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Miscellaneous current assets [abstract]
Advances to suppliers and contractors	₨ 4,340.7	$ 62.8	₨ 3,640.2
Taxes recoverable, statutory deposits and dues from government	50,719.5	733.4	56,749.8
Prepaid expenses	12,106.8	175.1	14,403.5
Others	1,455.2	21	1,832
Total	₨ 68,622.2	$ 992.3	₨ 76,625.5

Other Non-current Assets - Summ

Other Non-current Assets - Summary of Other Non-current Assets (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Miscellaneous non-current assets [abstract]
Taxes recoverable, statutory deposits and dues from government	₨ 10,819	$ 156.4	₨ 10,496.3
Prepaid rentals on operating leases	3,625.7	52.4	3,817.2
Prepaid expenses	7,684.2	111.1	7,660
Others	3,399.6	49.2	2,027.6
Total	₨ 25,528.5	$ 369.1	₨ 24,001.1

Other Non-current Assets - Addi

Other Non-current Assets - Additional Information (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Miscellaneous non-current assets [abstract]
Pension assets	₨ 16.4	₨ 15.7

Property, Plant and Equipment -

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	₨ 850,444.1
Capital work-in-progress	87,996.3		₨ 163,891.7
Ending balance	762,303.3	$ 11,023.1	850,444.1
Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,231,438.2		976,458.6
Additions	239,691.5		196,195.4
Asset acquired in business combination			582.3
Reversal of assets classified as held for sale	3,076.6
Assets classified as held for sale			(7,001.4)
Write down of assets			(6,468.8)
Currency translation	(22,111.4)		103,542.9
Disposal	(59,645)		(31,870.8)
Ending balance	1,392,449.9		1,231,438.2
Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(544,885.8)		(432,560.4)
Depreciation for the year	(120,827.5)		(107,620.9)
Reversal of assets classified as held for sale	(1,601.5)
Assets classified as held for sale			2,615.8
Write down of assets	(111,187)		3,890.8
Currency translation	5,077.2		(40,633.6)
Disposal	55,281.7		29,422.5
Ending balance	(718,142.9)		(544,885.8)
Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	686,552.4
Ending balance	674,307		686,552.4
Land and buildings [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	196,031.4		146,419
Additions	68,356.7		34,576.8
Asset acquired in business combination			21.6
Reversal of assets classified as held for sale	638.9
Assets classified as held for sale			(1,273.1)
Currency translation	(5,218.1)		16,380.8
Disposal	(426.3)		(93.7)
Ending balance	259,382.6		196,031.4
Land and buildings [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(33,149.1)		(24,775.8)
Depreciation for the year	(9,199.8)		(6,560.6)
Reversal of assets classified as held for sale	(260.4)
Assets classified as held for sale			340.5
Currency translation	488.1		(2,181)
Disposal	251.2		27.8
Ending balance	(41,870)		(33,149.1)
Land and buildings [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	162,882.3
Ending balance	217,512.6		162,882.3
Plant and equipment [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	992,423.7		791,127.5
Additions	162,366.3		156,105.9
Asset acquired in business combination			2.2
Reversal of assets classified as held for sale	461.8
Assets classified as held for sale			(3,675.3)
Write down of assets			(5,368.2)
Currency translation	(16,339.3)		83,892.9
Disposal	(55,547.1)		(29,661.3)
Ending balance	1,083,365.4		992,423.7
Plant and equipment [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(490,346)		(388,261.8)
Depreciation for the year	(107,143.4)		(97,363.3)
Reversal of assets classified as held for sale	(137.3)
Assets classified as held for sale			1,160.3
Write down of assets	(105,718)		3,890.8
Currency translation	4,451.2		(37,328)
Disposal	51,925.2		27,556
Ending balance	(646,968.3)		(490,346)
Plant and equipment [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	502,077.7
Ending balance	436,397.1		502,077.7
Vehicles [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	3,841.5		2,989
Additions	1,095.1		1,340.2
Reversal of assets classified as held for sale	38.8
Assets classified as held for sale			(38.8)
Currency translation	(6.4)		114.6
Disposal	(470.4)		(563.5)
Ending balance	4,498.6		3,841.5
Vehicles [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(1,859.2)		(1,832.6)
Depreciation for the year	(675.9)		(483.8)
Reversal of assets classified as held for sale	(21.8)
Assets classified as held for sale			25.8
Write down of assets	(60.5)
Currency translation	(0.1)		(62.1)
Disposal	392.8		493.5
Ending balance	(2,224.7)		(1,859.2)
Vehicles [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	1,982.3
Ending balance	2,273.9		1,982.3
Computers [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	21,300.9		19,466.4
Additions	5,374.5		2,708.2
Asset acquired in business combination			131.2
Reversal of assets classified as held for sale	1,568.2
Assets classified as held for sale			(1,606.9)
Currency translation	(299.4)		1,436.4
Disposal	(2,723.8)		(834.4)
Ending balance	25,220.4		21,300.9
Computers [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(12,332.2)		(11,673.6)
Depreciation for the year	(2,544.8)		(1,869.4)
Reversal of assets classified as held for sale	(1,015)
Assets classified as held for sale			955.6
Write down of assets	(2,348.2)
Currency translation	67.9		(519.1)
Disposal	2,322		774.3
Ending balance	(15,850.3)		(12,332.2)
Computers [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	8,968.7
Ending balance	9,370.1		8,968.7
Furniture and fixtures [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	14,293.8		12,223.1
Additions	2,255.1		1,464.3
Asset acquired in business combination			427.3
Reversal of assets classified as held for sale	368.9
Assets classified as held for sale			(407.3)
Currency translation	(199)		1,218.2
Disposal	(463.7)		(631.8)
Ending balance	16,255.1		14,293.8
Furniture and fixtures [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(7,199.3)		(6,016.6)
Depreciation for the year	(1,263.6)		(1,343.8)
Reversal of assets classified as held for sale	(167)
Assets classified as held for sale			133.6
Write down of assets	(1,443.4)
Currency translation	70.1		(543.4)
Disposal	390.5		570.9
Ending balance	(9,612.7)		(7,199.3)
Furniture and fixtures [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	7,094.5
Ending balance	6,642.4		7,094.5
Heritage Assets [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	3,546.9		4,233.6
Additions	243.8
Write down of assets			(1,100.6)
Currency translation	(49.2)		500
Disposal	(13.7)		(86.1)
Ending balance	3,727.8		3,546.9
Heritage Assets [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Write down of assets	(1,616.9)
Ending balance	(1,616.9)
Heritage Assets [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	3,546.9
Ending balance	₨ 2,110.9		₨ 3,546.9

Property, Plant and Equipment_2

Property, Plant and Equipment - Summary of Net Carrying Amounts of Property, Plant and Equipment under Finance Lease Arrangements (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment under finance lease arrangements	₨ 907.4	$ 13.1	₨ 1,192.7
Buildings [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment under finance lease arrangements	553.2	8	378.5
Plant and equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment under finance lease arrangements	298.2	4.3	693.2
Computers [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Property, plant and equipment under finance lease arrangements	₨ 56	$ 0.8	₨ 121

Property, Plant and Equipment_3

Property, Plant and Equipment - Additional Information (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Freehold land [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Land	₨ 29,582.7	₨ 30,097.9

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Rental Payments under Non-cancellable Operating Leases and Finance Leases (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of finance lease and operating lease by lessee [line items]
Operating, minimum lease payments, minimum lease commitments	₨ 62,223.6	$ 899.8	₨ 53,678.7
Finance, minimum lease payments, minimum lease commitments	3,793.4	54.9	917
Finance, less: future finance charges	(2,058.7)		(227.2)
Finance, present value of minimum lease payments	1,734.7	25.1	689.8
Included in the financial statements as: Other financial liabilities - current (refer note 20)	173	2.5	222.3
Included in the financial statements as: Other financial liabilities - non-current (refer note 21)	1,561.7	22.6	467.5
Finance lease liabilities	1,734.7	$ 25.1	689.8
Not later than one year [Member]
Disclosure of finance lease and operating lease by lessee [line items]
Operating, minimum lease payments, minimum lease commitments	10,994.1		8,808
Finance, minimum lease payments, minimum lease commitments	330		253.9
Finance, present value of minimum lease payments	295.9		222.3
Later than one year but not later than five years [Member]
Disclosure of finance lease and operating lease by lessee [line items]
Operating, minimum lease payments, minimum lease commitments	26,261.2		21,527.8
Finance, minimum lease payments, minimum lease commitments	970.9		282.5
Finance, present value of minimum lease payments	791.2		221.9
Later than five years [Member]
Disclosure of finance lease and operating lease by lessee [line items]
Operating, minimum lease payments, minimum lease commitments	24,968.3		23,342.9
Finance, minimum lease payments, minimum lease commitments	2,492.5		380.6
Finance, present value of minimum lease payments	₨ 647.6		₨ 245.6

Leases - Additional Information

Leases - Additional Information (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of finance lease and operating lease by lessee [abstract]
Operating lease rent expenses	₨ 10,774.2	₨ 10,223.9	₨ 8,224.8

Goodwill - Summary of Goodwill

Goodwill - Summary of Goodwill (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of reconciliation of changes in goodwill [abstract]
Balance at the beginning	₨ 1,164.5	$ 16.8	₨ 6,733.2
Impairment	(81.1)	(1.2)		₨ (142.5)
Reversal of/(classified as) held for sale	6,399.2	92.6	(5,579.1)
Currency translation	(3.9)	(0.1)	10.4
Balance at the end	₨ 7,478.7	$ 108.1	₨ 1,164.5	₨ 6,733.2

Goodwill - Additional Informati

Goodwill - Additional Information (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2018USD ($)	Mar. 31, 2017INR (₨)
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	₨ 7,478.7	$ 108.1	₨ 1,164.5	$ 16.8	₨ 6,733.2
Estimated cash flows, pre-tax discount rate	11.80%	11.80%	8.70%	8.70%
Estimated cash flows, growth rate	1.90%	1.90%	2.00%	2.00%
Goodwill [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Estimated cash flows, pre-tax discount rate	12.70%	12.70%
Estimated cash flows, growth rate	2.00%	2.00%
Software consultancy and services cash generating unit [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	₨ 6,399.2
Tata and other brand vehicles [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	1,079.5		₨ 1,081
Others [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	₨ 6,399.2
Jaguar Land Rover vehicles [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill			₨ 83.5

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about intangible assets [line items]
Beginning balance	₨ 685,167.9
Additions	173,698.8	$ 2,511.7	₨ 161,196.8
Reversal of assets classified as held for sale	125.4	1.8
Ending balance	580,555.9	$ 8,395	685,167.9
Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	825,601.2		590,745.9
Additions	123,089		165,155.3
Asset acquired in Business Combination			462.1
Reversal of assets classified as held for sale	2,992.7
Assets classified as held for sale			(2,992)
Currency translation	(15,830)		86,324.5
Fully amortized not in use	(90,542.1)		(14,094.6)
Ending balance	845,310.8		825,601.2
Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(367,628.9)		(243,591.6)
Amortization for the year	(109,370.3)		(102,197.3)
Reversal of assets classified as held for sale	(1,821.1)
Assets classified as held for sale			1,816.5
Write down of assets	(101,882.7)		(1,127.1)
Currency translation	5,692.4		(36,624)
Fully amortized not in use	90,542.1		14,094.6
Ending balance	(484,468.5)		(367,628.9)
Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	457,972.3
Ending balance	360,842.3		457,972.3
Capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	227,195.6
Ending balance	219,713.6		227,195.6
Software [Member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	63,015.3		52,128.4
Additions	8,446.9		8,472
Asset acquired in Business Combination			126.2
Reversal of assets classified as held for sale	2,488.3
Assets classified as held for sale			(2,488.3)
Currency translation	(1,923.6)		6,943.2
Fully amortized not in use	(4,345.1)		(2,166.2)
Ending balance	67,681.8		63,015.3
Software [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(32,351.4)		(22,148.2)
Amortization for the year	(10,434.8)		(9,972.6)
Reversal of assets classified as held for sale	(1,706.3)
Assets classified as held for sale			1,700.5
Write down of assets	(6,694)		(1,127.1)
Currency translation	540.6		(2,970.2)
Fully amortized not in use	4,345.1		2,166.2
Ending balance	(46,300.8)		(32,351.4)
Software [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	30,663.9
Ending balance	21,381		30,663.9
Patents and technical know-how [member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	15,221.2		13,136.9
Additions	21.8		427.5
Reversal of assets classified as held for sale	17.5
Assets classified as held for sale			(16.8)
Currency translation	(283.5)		1,673.6
Fully amortized not in use	(382)
Ending balance	14,595		15,221.2
Patents and technical know-how [member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(13,956.4)		(10,960.5)
Amortization for the year	(768.3)		(1,350.7)
Reversal of assets classified as held for sale	(4.8)
Assets classified as held for sale			6.4
Currency translation	375.4		(1,651.6)
Fully amortized not in use	382
Ending balance	(13,972.1)		(13,956.4)
Patents and technical know-how [member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	1,264.8
Ending balance	622.9		1,264.8
Customer related [Member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	5,612.7		5,166
Additions			223.1
Reversal of assets classified as held for sale	486.9
Assets classified as held for sale			(486.9)
Currency translation	(119.6)		710.5
Ending balance	5,980		5,612.7
Customer related [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(2,731.2)		(2,254.4)
Amortization for the year	(293.5)		(260.9)
Reversal of assets classified as held for sale	(110)
Assets classified as held for sale			109.6
Write down of assets	(617.3)
Currency translation	52.3		(325.5)
Ending balance	(3,699.7)		(2,731.2)
Customer related [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	2,881.5
Ending balance	2,280.3		2,881.5
Intellectual property rights and other intangibles [Member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	3,268.3		1,950
Additions	445.9		615.3
Asset acquired in Business Combination			335.9
Currency translation	(84.5)		367.1
Fully amortized not in use	(82.8)
Ending balance	3,546.9		3,268.3
Intellectual property rights and other intangibles [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(882.3)		(396.2)
Amortization for the year	(395.7)		(536.7)
Write down of assets	(474)
Currency translation	(95.9)		50.6
Fully amortized not in use	82.8
Ending balance	(1,765.1)		(882.3)
Intellectual property rights and other intangibles [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	2,386
Ending balance	1,781.8		2,386
Product development costs [Member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	681,420.6		468,329.6
Additions	114,174.4		155,417.4
Currency translation	(12,321.8)		69,602
Fully amortized not in use	(85,732.2)		(11,928.4)
Ending balance	697,541		681,420.6
Product development costs [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	(317,707.6)		(207,832.3)
Amortization for the year	(97,478)		(90,076.4)
Write down of assets	(80,928.6)
Currency translation	4,961.1		(31,727.3)
Fully amortized not in use	85,732.2		11,928.4
Ending balance	(405,420.9)		(317,707.6)
Product development costs [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	363,713
Ending balance	292,120.1		363,713
Indefinite life trademarks and brands [Member] | Cost [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	57,063.1		50,035
Currency translation	(1,097)		7,028.1
Ending balance	55,966.1		57,063.1
Indefinite life trademarks and brands [Member] | Accumulated depreciation and amortization [Member]
Disclosure of detailed information about intangible assets [line items]
Write down of assets	(13,168.8)
Currency translation	(141.1)
Ending balance	(13,309.9)
Indefinite life trademarks and brands [Member] | Net carrying amount before capital work-in-progress [Member]
Disclosure of detailed information about intangible assets [line items]
Beginning balance	57,063.1
Ending balance	₨ 42,656.2		₨ 57,063.1

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Off set against assets [member]
Disclosure of detailed information about intangible assets [line items]
Capitalized product development expenditure	₨ 8,350.6	₨ 8,717.5	₨ 7,626.7
Other income/(loss) (net) [member]
Disclosure of detailed information about intangible assets [line items]
Capitalized product development expenditure	₨ 1,601.5	₨ 3,845.9	₨ 3,331.1

Intangible Assets - Summary o_2

Intangible Assets - Summary of Intangible Assets Under Development (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2019USD ($)
Disclosure of detailed information about intangible assets [abstract]
Cost as at April 1,	₨ 227,195.6		₨ 224,359.5	$ 3,285.3
Additions	173,698.8	$ 2,511.7	161,196.8
Transferred to other intangible assets	(122,621.4)		(164,960.7)	(1,773.1)
Transferred to Held for Sale			(1,901)
Reversal of assets classified as held for sale	125.4	1.8
Provision for impairment/Write off	(53,864.8)	(778.9)	(15,766.4)
Currency translation	(4,820)	$ (69.7)	24,267.4
Balance at the end	₨ 219,713.6		₨ 227,195.6	$ 3,177.1

Impairment of Jaguar Land Rov_3

Impairment of Jaguar Land Rover Business - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2017INR (₨)
Disclosure of impairment loss and reversal of impairment loss [abstract]
Recoverable value	₨ 722,907.6
Impairment Charge	278,379.1
Impairment of Goodwill	₨ 81.1	$ 1.2	₨ 142.5

Impairment of Jaguar Land Rov_4

Impairment of Jaguar Land Rover Business - Summary of Impairment of Jaguar Land Rover Business - Assumptions Used (Detail)	Mar. 31, 2019	Mar. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [abstract]
Growth rate applied beyond approved forecast period	1.90%	2.00%
Pre-tax discount rate	11.80%	8.70%

Impairment of Jaguar Land Rov_5

Impairment of Jaguar Land Rover Business - Summary of Impairment of Jaguar Land Rover Business (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	₨ 278,379.1
Plant and equipment [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	108,570.1
Capital Work in Progress [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	16,560.8
Goodwill [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	81.1
Intangible Assets [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	101,873.4
Capital work-in-progress [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment loss	₨ 51,293.7

Impairment of Jaguar Land Rov_6

Impairment of Jaguar Land Rover Business - Summary of Impairment Sensitivity to Key Assumptions (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss	₨ 278,379.1
Increase in discount rate by 1% [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss	100,828.7
Decrease in long-term growth rate applied beyond approved forecast period by 0.5% [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss	43,716.6
Decrease in projected volume growth rate by 5% [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss	388,923.7
Decrease in projected gross margin by 1% [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment loss	₨ 188,986

Impairment of Jaguar Land Rov_7

Impairment of Jaguar Land Rover Business - Summary of Impairment Sensitivity to Key Assumptions (Parenthetical) (Detail)	12 Months Ended
	Mar. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [abstract]
Percentage of increase in discount rate	1.00%
Percentage of decrease in long-term growth rate applied beyond approved forecast period	0.50%
Percentage of decrease in projected volume growth rate	5.00%
Percentage of decrease in projected gross margin	1.00%

Investments in Equity Account_3

Investments in Equity Accounted Investees - Summary of Financial Information of Immaterial Associates Accounted for using the Equity Method (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Disclosure of associates [line items]
Company's share of other comprehensive income in associates	₨ (474.6)	$ (6.9)	₨ 3,996.7	₨ (3,087)
Immaterial associates [Member]
Disclosure of associates [line items]
Carrying amount of the Company's interest in associates	10,393.4		9,333.4		$ 150.3
Company's share of profit/(loss) in associates	1,110.6	16.1	1,183	1,109.3
Company's share of other comprehensive income in associates	83.2	1.2	(19)	(155.1)
Company's share of total comprehensive income in associates	₨ 1,193.8	$ 17.3	₨ 1,164	₨ 954.2

Investments in Equity Account_4

Investments in Equity Accounted Investees - Additional Information (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of significant investments in associates and joint ventures [line items]
Fair value of investment in an equity accounted associate for which published price quotation is available	₨ 1,696.9	₨ 3,380.4
Carrying amount of investment in an equity accounted associate for which published price quotation is available	1,387	1,414.8
Chery Jaguar Land Rover Automotive Co. Limited [member]
Disclosure of significant investments in associates and joint ventures [line items]
Dividend received by a subsidiary in UK from Chery Jaguar Land Rover Automotive Co. Ltd.	₨ 1,990.3	₨ 17,644.9	₨ 5,928.8
Loginomic Tech Soluitons Pvt. Limited [member]
Disclosure of significant investments in associates and joint ventures [line items]
Percentage of ordinary share capital purchased	26.00%
Value of ordinary share capital purchased	₨ 26.6

Investments in Equity Account_5

Investments in Equity Accounted Investees - Summary of Material Joint Venture (Detail) ₨ in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2016INR (₨)
Disclosure of joint ventures [line items]
Current assets	₨ 1,228,275,200		₨ 1,362,648,300		$ 17,761,300
Non-current assets	1,758,844,700		1,872,862,600		25,433,500
Current liabilities	(1,447,750,600)		(1,427,782,700)		(20,935,100)
Non-current liabilities	(981,301,900)		(894,207,200)		(14,189,800)
Cash and cash equivalents	215,598,000		147,167,500	₨ 139,867,600	3,117,600	$ 2,128,100	₨ 171,536,100
Revenue	2,993,662,400	$ 43,289,200	2,882,951,100	2,656,495,100
Net income/(loss)	(292,128,100)	(4,224,100)	66,061,900	59,563,200
Other comprehensive income	(50,076,500)	(724,400)	309,197,700	(287,597,200)
Total comprehensive income for the year	(342,204,600)	(4,948,500)	375,259,600	(228,034,000)
Depreciation and amortization	230,197,800	3,328,700	209,818,200	182,405,400
Interest income	(7,864,600)	(113,700)	(7,122,400)	(5,640,700)
Interest expense (net)	57,586,000	832,700	46,791,300	42,365,700
Income tax expense/(credit)	₨ (25,425,000)	$ (367,700)	₨ 37,678,200	35,035,600
Chery Jaguar Land Rover Automotive Co. Limited [member]
Disclosure of joint ventures [line items]
Principal activity	Manufacture and assembly of vehicles	Manufacture and assembly of vehicles
Principal place of the business	China	China
% holding	50.00%	50.00%	50.00%
Current assets	₨ 67,701,900		₨ 82,317,900		979,000
Non-current assets	130,244,700		122,184,900		1,883,400
Current liabilities	(99,923,600)		(99,298,300)		(1,444,900)
Non-current liabilities	(11,042,400)		(14,184,100)		(159,700)
Cash and cash equivalents	28,601,300		40,466,800		413,600
Current financial liabilities (excluding trade and other payables and provisions)	(25,161,900)		(3,885,200)		(363,800)
Non-current financial liabilities (excluding trade and other payables and provisions)	(11,042,300)		(13,999,600)		(159,700)
Share of net assets of material joint venture	43,490,300		45,510,200		628,900
Other consolidation adjustments	(534,900)		(1,016,200)		(7,800)
Carrying amount of the Company's interest in joint venture	42,955,400		44,494,000		$ 621,100
Revenue	155,715,000	$ 2,251,700	237,876,100	189,601,300
Net income/(loss)	1,119,500	16,200	43,381,300	27,320,600
Other comprehensive income	0	0	0	0
Total comprehensive income for the year	1,119,500	16,200	43,381,300	27,320,600
Depreciation and amortization	18,857,600	272,700	11,947,800	9,201,100
Interest income	(1,092,000)	(15,800)	(2,298,700)	(993,200)
Interest expense (net)	1,266,300	18,300	609,000	706,600
Income tax expense/(credit)	₨ 578,100	$ 8,400	₨ 11,630,500	₨ 9,014,400

Investments in Equity Account_6

Investments in Equity Accounted Investees - Summary of Reconciliation of Financial Information to Carrying Amount of Interest in Joint Venture (Detail) - Chery Jaguar Land Rover Automotive Co. Limited [member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of joint ventures [line items]
Net assets of the joint venture	₨ 86,980.6	$ 1,257.8	₨ 91,020.4
Proportion of the Company's interest in joint venture	43,490.3	628.9	45,510.2
Other consolidation adjustments	(534.9)	(7.8)	(1,016.2)
Carrying amount of the Company's interest in joint venture	₨ 42,955.4	$ 621.1	₨ 44,494

Investments in Equity Account_7

Investments in Equity Accounted Investees - Summary of Financial Information of Immaterial Joint Ventures Accounted for using the Equity Method (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of joint ventures [line items]
Company's share of other comprehensive income in immaterial joint ventures	₨ (474.6)	$ (6.9)	₨ 3,996.7	₨ (3,087)
Immaterial joint ventures [Member]
Disclosure of joint ventures [line items]
Carrying amount of the Company's interest in joint ventures			25
Company's share of profit/(loss) in immaterial joint ventures	(25)	(0.4)	162.5	276.5
Company's share of other comprehensive income in immaterial joint ventures				(130.3)
Company's share of total comprehensive income in associates	₨ (25)	$ (0.4)	₨ 162.5	₨ 146.2

Investments in Equity Account_8

Investments in Equity Accounted Investees - Summary of Investments in Equity Accounted Investees (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Disclosure of joint ventures [line items]
Carrying amount in immaterial associates (held for sale)			₨ 4,973.5
Carrying amount of interest in equity accounted investees	₨ 53,348.8		53,852.4		$ 771.4
Current (held for sale)			4,973.5
Non current	53,348.8		48,878.9		771.4
Carrying amount of interest in equity accounted investees	53,348.8		53,852.4		771.4
Share of profit/(loss) in equity accounted investees	2,095	$ 30.3	22,782.6	₨ 14,930
Share of other comprehensive income in equity accounted investees	(474.6)	(6.9)	3,996.7	(3,087)
Chery Jaguar Land Rover Automotive Co. Limited [member]
Disclosure of joint ventures [line items]
Carrying amount in joint venture	42,955.4		44,494		621.1
Share of profit/(loss) in joint venture	559.8	8.1	21,690.7	13,660.3
Share of other comprehensive income, currency translation differences	(557.8)	(8.1)	4,015.7	(2,801.6)
Other adjustments in material joint venture [member]
Disclosure of joint ventures [line items]
Share of profit/(loss) in joint venture	449.6	6.5	(253.6)	(116.1)
Immaterial joint ventures [Member]
Disclosure of joint ventures [line items]
Carrying amount in joint venture			25
Share of profit/(loss) in joint venture	(25)	(0.4)	162.5	276.5
Share of other comprehensive income, currency translation differences				(130.3)
Share of other comprehensive income in equity accounted investees				(130.3)
Immaterial associates [Member]
Disclosure of joint ventures [line items]
Carrying amount in immaterial associates	10,393.4		4,359.9		$ 150.3
Share of profit/(loss) in immaterial associates	1,110.6	16.1	1,183	1,109.3
Share of other comprehensive income in immaterial associates	111.5	1.6	(113.8)	(40)
Share of other comprehensive income, currency translation differences	(28.3)	(0.4)	94.8	(115.1)
Share of other comprehensive income in equity accounted investees	₨ 83.2	$ 1.2	₨ (19)	₨ (155.1)

Income Taxes - Summary of Domes

Income Taxes - Summary of Domestic and Foreign Components of Net Income Before Income Tax (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of geographical areas [line items]
Net income before income taxes	₨ (317,553.1)	$ (4,591.8)	₨ 103,740.1	₨ 94,598.8
India [Member]
Disclosure of geographical areas [line items]
Net income before income taxes	27,429.8	396.6	(8,867.9)	(46,507.6)
Other than India [Member]
Disclosure of geographical areas [line items]
Net income before income taxes	₨ (344,982.9)	$ (4,988.4)	₨ 112,608	₨ 141,106.4

Income Taxes - Summary of Dom_2

Income Taxes - Summary of Domestic and Foreign Components of Income Tax Expense (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Deferred taxes
Deferred taxes	₨ (47,677.2)	$ (689.5)	₨ 4,649.7	₨ 3,661.7
Income tax expense/(credit) reported	(25,425)	(367.7)	37,678.2	35,035.6
India [Member]
Current taxes
Current taxes	5,034.3	72.8	2,420	1,842.8
Deferred taxes
Deferred taxes	(3,241.9)	(46.9)	494.6	3,111.6
Other than India [Member]
Current taxes
Current taxes	17,217.9	249	30,608.5	29,531.1
Deferred taxes
Deferred taxes	₨ (44,435.3)	$ (642.6)	₨ 4,155.1	₨ 550.1

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Estimated Income Tax to Income Tax Expense (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Income/(loss) before income taxes	₨ (317,553.1)	$ (4,591.8)	₨ 103,740.1	₨ 94,598.8
Income tax expense at tax rates applicable to individual entities	(54,712.2)	(791.2)	20,746.7	13,625.8
Additional deduction for patent, research and product development cost	(1,891.2)	(27.3)	(4,099.8)	(7,455.8)
Items (net) not deductible for tax /not liable to tax :
- foreign currency (gain)/loss relating to loans and deposits (net)	(82.8)	(1.2)	1,336.2	(739.8)
- interest, loss on conversion option and other expenses relating to borrowings for investment	621.6	9	337.8	531
- Dividend from subsidiaries, joint operations, equity accounted investees and available-for-saleinvestments	(15.5)	(0.2)	(50.1)	27.1
Undistributed earnings of subsidiaries, joint operations and equity accounted investees	1,277.8	18.5	9,170.1	4,134.3
Deferred tax assets not recognized because realization is not probable	4,738.7	68.5	9,902.3	29,372.1
Utilization/credit of unrecognized tax losses, unabsorbed depreciation and other tax benefits	(7,016.4)	(101.5)	(3,583.3)	(2,950.5)
Previously recognized deferred tax assets written down on account of provision for impairment in Jaguar Land Rover	26,981.5	390.2
Profit on sale of business by a subsidiary to another subsidiary				4,078.9
Profit on sale of investments in subsidiaries and Others	(932)	(13.5)
Tax on share of (profit)/loss of equity accounted investees (net)	(532.7)	(7.7)	(4,601.4)	(3,146.7)
Impact of change in statutory tax rates	4,540.4	65.7	5,392.6	(5,684.6)
Others	1,597.8	23	3,127.1	3,243.8
Income tax expense/(credit) reported	₨ (25,425)	$ (367.7)	₨ 37,678.2	₨ 35,035.6

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) ₨ in Millions, $ in Millions	Apr. 01, 2020	Mar. 31, 2018INR (₨)	Mar. 31, 2017	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)
Disclosure of income taxes [line items]
Impact of change in statutory tax rates, deferred tax assets		₨ 4,648.4
Unrecognized deferred tax assets				₨ 62,928.4	$ 910
Unrecognized deferred tax liability on undistributed profits of certain subsidiaries		₨ 745,891.7		445,510.6
United States of America [Member]
Disclosure of income taxes [line items]
Tax rate		21.00%	35.00%
Scenario plan [Member] | United Kingdom [Member]
Disclosure of income taxes [line items]
Tax rate	17.00%
Indefinitely [Member]
Disclosure of income taxes [line items]
Unrecognized deferred tax assets				57,631.5
Specified period [Member]
Disclosure of income taxes [line items]
Unrecognized deferred tax assets				₨ 62,928.4

Income Taxes - Summary of Signi

Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Changes in deferred tax assets and liabilities [line items]
Opening balance	₨ 20,193.2	$ 292	₨ (32,415.3)	₨ 3,865.5
Adjustment of initial application of IFRS 15	(84.5)	(1.2)
Adjusted Opening Balance	20,108.7	290.8
Recognized in profit or loss	(47,677.2)	(689.5)	4,649.7	3,661.7
Recognized in/reclassified from other comprehensive income	(9,020.2)	(130.4)	47,747.2	(39,942.5)
MAT Credit Utilized	15.8	0.2
Reversal of items classified as held for Sale in earlier year	(85.3)	(1.2)
Divestment of subsidiary	57.5	0.8
Closing balance	(36,600.7)	$ (529.3)	20,193.2	(32,415.3)
Deferred tax assets	51,511.1		41,064.6	44,221.7	$ 744.9
Deferred tax liabilities	(14,910.4)		(61,257.8)	(11,806.4)	$ (215.6)
Undistributed earnings in subsidiaries, joint operations and equity accounted investees, reversed on dividend distribution by subsidiaries	3,608.2		4,088.5	3,653.6
Classified as held for sale			211.6
Property, plant and equipment [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	16,852		14,335.3	16,117.2
Adjusted Opening Balance	16,852
Recognized in profit or loss	(1,142.6)		2,221.9	(1,787.8)
Recognized in/reclassified from other comprehensive income	(119.7)		453.5	5.9
Reversal of items classified as held for Sale in earlier year	56
Divestment of subsidiary	72.1
Closing balance	15,717.8		16,852	14,335.3
Classified as held for sale			(158.7)
Intangible assets [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	121,838.5		104,848.9	115,877.7
Adjusted Opening Balance	121,838.5
Recognized in profit or loss	(12,420.5)		5,305.1	2,879.2
Recognized in/reclassified from other comprehensive income	(1,881.1)		11,657.1	(13,908)
Reversal of items classified as held for Sale in earlier year	(27.4)
Closing balance	107,509.5		121,838.5	104,848.9
Classified as held for sale			27.4
Investments accounted for using equity method [member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	19,397.2		13,376.3	13,436.3
Adjusted Opening Balance	19,397.2
Recognized in profit or loss	(2,330.4)		5,081.6	480.7
Recognized in/reclassified from other comprehensive income	(174.6)		939.3	(540.7)
Closing balance	16,892.2		19,397.2	13,376.3
Fair valuation of retained interest in a subsidiary subsequent to disposal of controlling equity interest [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	169.5		169.5	169.5
Adjusted Opening Balance	169.5
Closing balance	169.5		169.5	169.5
Derivative financial instruments [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance			231.2	40.4
Recognized in profit or loss			(611.5)	200.2
Recognized in/reclassified from other comprehensive income			380.3	(9.4)
Closing balance				231.2
Others [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	136.6		446.9	624.1
Adjusted Opening Balance	136.6
Recognized in profit or loss	717.4		(81.2)	(222.8)
Recognized in/reclassified from other comprehensive income	176.1		(132.9)	45.6
Reversal of items classified as held for Sale in earlier year	120.9
Closing balance	1,151		136.6	446.9
Classified as held for sale			(96.2)
Deferred tax liabilities [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	158,393.8		133,408.1	146,265.2
Adjusted Opening Balance	158,393.8
Recognized in profit or loss	(15,176.1)		11,915.9	1,549.5
Recognized in/reclassified from other comprehensive income	(1,999.3)		13,297.3	(14,406.6)
Reversal of items classified as held for Sale in earlier year	149.5
Divestment of subsidiary	72.1
Closing balance	141,440		158,393.8	133,408.1
Classified as held for sale			(227.5)
Unabsorbed Depreciation [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(21,955.1)		(19,921)	(19,432.6)
Adjusted Opening Balance	(21,955.1)
Recognized in profit or loss	161.2		(2,150.3)	(489)
Recognized in/reclassified from other comprehensive income	0.1		(15.8)	0.6
Reversal of items classified as held for Sale in earlier year	(24.3)
Divestment of subsidiary	(124.4)
Closing balance	(21,942.5)		(21,955.1)	(19,921)
Classified as held for sale			132.1
Business loss carry forwards [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(42,737.4)		(27,509.3)	(34,321.9)
Adjustment of initial application of IFRS 15	(84.5)
Adjusted Opening Balance	(42,821.9)
Recognized in profit or loss	19,255.9		(11,944)	4,177
Recognized in/reclassified from other comprehensive income	723.9		(3,284.1)	2,635.6
Closing balance	(22,842.1)		(42,737.4)	(27,509.3)
Expenses deductible - provisions, allowances for doubtful receivables and others [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(30,213.9)		(26,824.2)	(33,149.5)
Adjusted Opening Balance	(30,213.9)
Recognized in profit or loss	(3,911.1)		(2,191.5)	5,127
Recognized in/reclassified from other comprehensive income	(2.2)		(1,233.1)	1,198.3
Reversal of items classified as held for Sale in earlier year	(21.2)
Divestment of subsidiary	(24.5)
Closing balance	(34,172.9)		(30,213.9)	(26,824.2)
Classified as held for sale			34.9
Compensated absences and retirement benefits [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(8,426.3)		(21,729.6)	(11,859)
Adjusted Opening Balance	(8,426.3)
Recognized in profit or loss	(32.7)		7,224.7	6.2
Recognized in/reclassified from other comprehensive income	(3,858.5)		5,941.6	(9,876.8)
Reversal of items classified as held for Sale in earlier year	(132.4)
Divestment of subsidiary	(13)
Closing balance	(12,462.9)		(8,426.3)	(21,729.6)
Classified as held for sale			137
Minimum alternate tax carry-forward [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(381.9)		(749.2)	(582.6)
Adjusted Opening Balance	(381.9)
Recognized in profit or loss	(817.8)		329.5	(166.6)
MAT Credit Utilized	15.8
Reversal of items classified as held for Sale in earlier year	(37.8)
Divestment of subsidiary	155.5
Closing balance	(1,066.2)		(381.9)	(749.2)
Classified as held for sale			37.8
Property, plant and equipment [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(926.5)		(1,119)	(2,109.3)
Adjusted Opening Balance	(926.5)
Recognized in profit or loss	(48,258.9)		308.3	738.1
Recognized in/reclassified from other comprehensive income	(108.2)		(115.8)	252.2
Closing balance	(49,293.6)		(926.5)	(1,119)
Derivative financial instruments [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(7,552.4)		(44,289.4)	(22,966.4)
Adjusted Opening Balance	(7,552.4)
Recognized in profit or loss	(1,022.1)		465.4	1,283.3
Recognized in/reclassified from other comprehensive income	(3,674.7)		36,267.6	(22,606.3)
Reversal of items classified as held for Sale in earlier year	(3.9)
Closing balance	(12,253.1)		(7,552.4)	(44,289.4)
Classified as held for sale			3.9
Unrealized profit on inventory [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(15,079.2)		(15,696.4)	(12,233.4)
Adjusted Opening Balance	(15,079.2)
Recognized in profit or loss	3,811.5		3,038.2	(5,519.4)
Recognized in/reclassified from other comprehensive income	(151)		(2,421)	2,056.4
Closing balance	(11,418.7)		(15,079.2)	(15,696.4)
Others [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(10,927.9)		(7,985.3)	(5,745)
Adjusted Opening Balance	(10,927.9)
Recognized in profit or loss	(1,687.1)		(2,346.5)	(3,044.4)
Recognized in/reclassified from other comprehensive income	49.7		(689.5)	804.1
Reversal of items classified as held for Sale in earlier year	(15.2)
Divestment of subsidiary	(8.2)
Closing balance	(12,588.7)		(10,927.9)	(7,985.3)
Classified as held for sale			93.4
Deferred tax assets [Member]
Changes in deferred tax assets and liabilities [line items]
Opening balance	(138,200.6)		(165,823.4)	(142,399.7)
Adjustment of initial application of IFRS 15	(84.5)
Adjusted Opening Balance	(138,285.1)
Recognized in profit or loss	(32,501.1)		(7,266.2)	2,112.2
Recognized in/reclassified from other comprehensive income	(7,020.9)		34,449.9	(25,535.9)
MAT Credit Utilized	15.8
Reversal of items classified as held for Sale in earlier year	(234.8)
Divestment of subsidiary	(14.6)
Closing balance	₨ (178,040.7)		(138,200.6)	₨ (165,823.4)
Classified as held for sale			₨ 439.1

Income Taxes - Summary of Unrec

Income Taxes - Summary of Unrecognized Deferred Tax Assets Expire Unutilized based on Year of Origination (Detail) - Mar. 31, 2019 ₨ in Millions, $ in Millions	INR (₨)	USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	₨ 62,928.4	$ 910
2020 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	525	7.6
2021 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	3,995.5	57.8
2022 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	4,142.4	59.9
2023 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	8,859.5	128.1
2024 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	7,161.4	103.6
Thereafter [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	₨ 38,244.6	$ 553

Short-term Borrowings and Curre

Short-term Borrowings and Current Portion of Long-term Debt - Summary of Short-term Borrowings and Current Portion of Long-term Debt (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Borrowings [abstract]
Commercial paper	₨ 109,525.6	$ 1,583.8	₨ 105,815.5
Loans from banks/financial institutions	91,247	1,319.5	61,273
Inter-corporate deposits	730	10.5	860
Current portion of long-term debt (refer note 21)	150,341.1	2,174	109,338.9
Total	₨ 351,843.7	$ 5,087.8	₨ 277,287.4

Long-term Debt - Summary of Lon

Long-term Debt - Summary of Long-term Debt (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Borrowings [abstract]
Non-convertible debentures	₨ 127,793.8	$ 1,847.9	₨ 148,107.9
Collateralized debt obligations	30,473.3	440.7	13,205.8
Buyers credit from banks at floating interest rate	25,000	361.5	15,000
Loan from banks/financial institutions	279,380.1	4,039.8	137,181.5
Senior notes	382,845.6	5,536.1	396,301.9
Others	12,915.3	186.8	10,961.2
Total	858,408.1	12,412.8	720,758.3
Less: current portion (refer note 20)	150,341.1	2,174	109,338.9
Long-term debt	₨ 708,067	$ 10,238.8	₨ 611,419.4

Long-term Debt - Additional Inf

Long-term Debt - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2019USD ($)
Disclosure of detailed information about borrowings [line items]
Loan amount	₨ 1,059,910.7	₨ 888,706.8	$ 15,326.6
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Financial assets pledged as collateral for liabilities	₨ 308,850.5	₨ 181,969.1
Long-term borrowings [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Maturity	April 2019
Long-term borrowings [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 2023
Loans from banks/financial institutions (short-term) [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Commercial paper issued interest rate		7.21%
Loans from banks/financial institutions (short-term) [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Commercial paper issued interest rate		9.10%
Marginal cost lending rate [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Loan amount	₨ 220,311.8
London interbank offered rate (LIBOR) 1 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Loan amount	₨ 59,068.3
Buyers credit from banks at floating interest rate [Member]
Disclosure of detailed information about borrowings [line items]
Maturity		Four years
Non-convertible debentures [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	7.28%		7.28%
Non-convertible debentures [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	11.50%		11.50%

Long-term Debt - Summary of Det

Long-term Debt - Summary of Details of Tranches of Senior Notes Listed on the Euro MTF Market (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2019GBP (£)	Mar. 31, 2019EUR (€)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about borrowings [line items]
Outstanding	₨ 382,845.6	$ 5,536,100,000			₨ 396,301.9
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member]
Disclosure of detailed information about borrowings [line items]
Outstanding | ₨	₨ 326,817.9				328,231.3
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 5.625% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	January 2013
Currency	USD
Initial Principal amounts | $		500,000,000
Outstanding Principal amounts | $		$ 500,000,000
Outstanding | ₨	₨ 34,464				32,485.2
Interest rate	5.625%	5.625%	5.625%	5.625%
Redeemable on	February 2023
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 3.875% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	February 2015
Currency	GBP
Initial Principal amounts | £			£ 400,000,000
Outstanding Principal amounts | £			£ 400,000,000
Outstanding | ₨	₨ 36,005.8				36,664.8
Interest rate	3.875%	3.875%	3.875%	3.875%
Redeemable on	March 2023
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 5.000% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	January 2014
Currency	GBP
Initial Principal amounts | £			£ 400,000,000
Outstanding Principal amounts | £			£ 400,000,000
Outstanding | ₨	₨ 35,969.8				36,598.4
Interest rate	5.00%	5.00%	5.00%	5.00%
Redeemable on	February 2022
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 3.500% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	March 2015
Currency	USD
Initial Principal amounts | $		$ 500,000,000
Outstanding Principal amounts | $		$ 500,000,000
Outstanding | ₨	₨ 34,686.5				32,713.6
Interest rate	3.50%	3.50%	3.50%	3.50%
Redeemable on	March 2020
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 4.125% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	December 2013
Currency	USD
Initial Principal amounts | $		$ 700,000,000
Outstanding | ₨					45,844.7
Interest rate	4.125%	4.125%	4.125%	4.125%
Redeemable on	December 2018
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 4.250% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	October 2014
Currency	USD
Initial Principal amounts | $		$ 500,000,000
Outstanding Principal amounts | $		$ 500,000,000
Outstanding | ₨	₨ 34,713				32,738.4
Interest rate	4.25%	4.25%	4.25%	4.25%
Redeemable on	November 2019
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 2.750% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	January 2017
Currency	GBP
Initial Principal amounts | £			£ 300,000,000
Outstanding Principal amounts | £			£ 300,000,000
Outstanding | ₨	₨ 27,036.8				27,504.6
Interest rate	2.75%	2.75%	2.75%	2.75%
Redeemable on	January 2021
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 2.200% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	January 2017
Currency	EUR
Initial Principal amounts | €				€ 650,000,000
Outstanding Principal amounts | €				€ 650,000,000
Outstanding | ₨	₨ 50,367				52,112.4
Interest rate	2.20%	2.20%	2.20%	2.20%
Redeemable on	January 2024
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 4.500% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	October 2017
Currency	USD
Initial Principal amounts | $		$ 500,000,000
Outstanding Principal amounts | $		$ 500,000,000
Outstanding | ₨	₨ 34,585.5				₨ 31,569.2
Interest rate	4.50%	4.50%	4.50%	4.50%
Redeemable on	March 2027
Jaguar Land Rover Automotive Plc [Member] | Luxembourg Stock Exchange [Member] | 4.500% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	October 2018
Currency	USD
Initial Principal amounts | $		$ 500,000,000
Outstanding Principal amounts | $		$ 500,000,000
Outstanding | ₨	₨ 38,989.5
Interest rate	4.50%	4.50%	4.50%	4.50%
Redeemable on	January 2026

Long-term Debt - Summary of D_2

Long-term Debt - Summary of Details of Tranches of Senior Notes Listed on the SGX-ST Market (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about borrowings [line items]
Outstanding	₨ 382,845.6	$ 5,536,100,000	₨ 396,301.9
Singapore Stock Exchange [Member]
Disclosure of detailed information about borrowings [line items]
Outstanding | ₨	₨ 56,027.7		68,070.6
Singapore Stock Exchange [Member] | 5.750% senior notes 1 [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	October 2014
Currency	USD
Initial Principal amounts		250,000,000
Outstanding Principal amounts		$ 250,000,000
Outstanding | ₨	₨ 17,187.3		16,194.3
Interest rate	5.75%	5.75%
Redeemable on	October 2024
Singapore Stock Exchange [Member] | 4.625% senior notes [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	October 2014
Currency	USD
Initial Principal amounts		$ 500,000,000
Outstanding Principal amounts		$ 262,532,000
Outstanding | ₨	₨ 18,048.8		32,388.6
Interest rate	4.625%	4.625%
Redeemable on	April 2020
TML Holdings Pte Ltd [Member] | Singapore Stock Exchange [Member] | 5.750% senior notes 2 [Member]
Disclosure of detailed information about borrowings [line items]
Issued on	May 2014
Currency	USD
Initial Principal amounts		$ 300,000,000
Outstanding Principal amounts		$ 300,000,000
Outstanding | ₨	₨ 20,791.6		₨ 19,487.7
Interest rate	5.75%	5.75%
Redeemable on	May 2021

Other Financial Liabilities - C

Other Financial Liabilities - Current - Summary of Other Current Financial Liabilities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Categories of current financial liabilities [abstract]
Liability towards vehicles sold under repurchase arrangements	₨ 42,436.5	$ 613.6	₨ 44,235.8
Interest accrued but not due	10,595.8	153.2	10,957.2
Lease liabilities	173	2.5	222.3
Derivative financial instruments	47,425.3	685.8	62,076.6
Unclaimed matured fixed deposits	73.4	1.1	107.7
Others	2,965.2	42.9	1,519
Total	₨ 103,669.2	$ 1,499.1	₨ 119,118.6

Other Financial Liabilities - N

Other Financial Liabilities - Non-current - Summary of Other Financial Liabilities Non-current (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Categories of non-current financial liabilities [abstract]
Lease liabilities	₨ 1,561.7	$ 22.6	₨ 467.5
Derivative financial instruments	26,624.4	385	24,502
Liability towards employee separation scheme	791	11.4	852.2
Retention money, security deposits and others	511.7	7.4	2,065.7
Total	₨ 29,488.8	$ 426.4	₨ 27,887.4

Provisions - Summary of Provisi

Provisions - Summary of Provisions (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Current
Current provisions	₨ 101,967.5		$ 1,474.5	₨ 79,418.5
Non-current
Non-current provisions	118,548.5		1,714.2	109,493.3
Employee benefits obligations [Member]
Non-current
Non-current provisions	8,263.5		119.5	7,380
Product warranty [Member]
Current
Current provisions	74,042.5		1,070.7	64,815
Non-current
Non-current provisions	100,970.1		1,460.1	94,521.6
Balance at the beginning	159,336.6	$ 2,304.1
Adjustment on initial application of IFRS 15 (refer note 2(x))	(1,376.5)	(19.9)
Provision made during the year	104,237	1,507.3
Provision used during the year	(86,087.7)	(1,244.9)
Impact of discounting	1,912.5	27.7
Currency translation	(3,009.3)	(43.5)
Balance at the end	175,012.6	2,530.8
Current	74,042.5		1,070.7
Non-current	100,970.1		1,460.1
Legal and product liability [Member]
Current
Current provisions	13,951.2		201.7	10,999.2
Non-current
Non-current provisions	3,913.1		56.6	2,199.5
Balance at the beginning	13,198.7	190.9
Provision made during the year	14,654.8	211.9
Provision used during the year	(9,857.3)	(142.5)
Currency translation	(131.9)	(2)
Balance at the end	17,864.3	258.3
Current	13,951.2		201.7
Non-current	3,913.1		56.6
Provision for residual risk [Member]
Current
Current provisions	851.2		12.3	622
Non-current
Non-current provisions	2,776.2		40.1	2,547.6
Balance at the beginning	3,169.6	45.8
Provision made during the year	724.9	10.5
Provision used during the year	(239.5)	(3.5)
Currency translation	(27.6)	(0.4)
Balance at the end	3,627.4	52.4
Current	851.2		12.3
Non-current	2,776.2		40.1
Provision for environmental liability [Member]
Current
Current provisions	1,254.7		18.1	978.8
Non-current
Non-current provisions	1,381.2		20	1,500.5
Balance at the beginning	2,479.3	35.9
Provision made during the year	1,009.4	14.6
Provision used during the year	(799.3)	(11.6)
Currency translation	(53.5)	(0.8)
Balance at the end	2,635.9	$ 38.1
Current	1,254.7		18.1
Non-current	1,381.2		20
Employee related and other provisions [Member]
Current
Current provisions	11,867.9		171.7	2,003.5
Other provisions [Member]
Non-current
Non-current provisions	₨ 1,244.4		$ 17.9	₨ 1,344.1

Provisions - Summary of Provi_2

Provisions - Summary of Provisions (Parenthetical) (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)
Disclosure of other provisions [abstract]
Estimated recovery from supplies	₨ (29.6)

Other Current Liabilities - Sum

Other Current Liabilities - Summary of Other Current Liabilities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Miscellaneous current liabilities [abstract]
Contract liabilities	₨ 45,773.8	$ 661.9	₨ 37,562.7
Statutory dues	39,139	566	31,768.3
Others	3,728.1	53.9	2,719.7
Total	₨ 88,640.9	$ 1,281.8	₨ 72,050.7

Other Liabilities - Non-curre_3

Other Liabilities - Non-current - Summary of Other Non-current Liabilities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Miscellaneous non-current liabilities [abstract]
Employee benefit obligations	₨ 61,101.2	$ 883.5	₨ 41,007.6
Contract liabilities	46,730.9	675.7	41,116.2
Others	2,455.1	35.6	2,025.5
Total	₨ 110,287.2	$ 1,594.8	₨ 84,149.3

Other Liabilities - Non-curre_4

Other Liabilities - Non-current - Summary of Movement of Contract Liabilities (Detail) ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)
Miscellaneous non-current liabilities [abstract]
Opening contract liabilities (regrouped on transition to IFRS 15)	₨ 78,678.9
Transition impact of IFRS 15	2,766.9
Amount recognized in revenue during the year	(35,783.9)
Amount received in advance during the year	49,580.5
Amount refunded to customers during the year	(2,175.5)
Reversal of liabilities directly associated with assets held-for-sale	717.7
Currency translation	(1,279.9)
Balance at the end	₨ 92,504.7

Other Liabilities - Non-curre_5

Other Liabilities - Non-current - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019
Miscellaneous non-current liabilities [abstract]
Description of future maintenance service and extended warranty period	Performance obligations in respect of amount received for future maintenance service and extended warranty will be fulfilled over a period of 6 years from year ending March 31 ,2020 till March 31, 2025.
Performance obligation expected timing for future maintenance service and extended warranty	6 years

Other Liabilities - Non-curre_6

Other Liabilities - Non-current - Summary of Contract Liabilities (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Miscellaneous non-current liabilities [abstract]
Advances received from customers - current	₨ 17,396.1
Deferred revenue - current	28,377.7
Deferred revenue -Non-current	46,730.9
Total contract liabilities	₨ 92,504.7	₨ 78,678.9

Equity - Summary of Movement of

Equity - Summary of Movement of Number of Shares and Share Capital (Detail) $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)shares	Mar. 31, 2019USD ($)shares	Mar. 31, 2018INR (₨)shares		Mar. 31, 2017INR (₨)shares
Disclosure of classes of share capital [line items]
Shares issued			₨ 0	[1]	₨ 45,500,000
Top of range [member]
Disclosure of classes of share capital [line items]
Shares issued			₨ 50,000
Ordinary shares [Member]
Disclosure of classes of share capital [line items]
Shares at the beginning | shares	2,887,348,694	2,887,348,694	2,887,348,428		2,887,203,602
Shares issued | shares	0	0	266		144,826
Shares at the end | shares	2,887,348,694	2,887,348,694	2,887,348,694		2,887,348,428
Shares at the beginning	₨ 5,775,200,000		₨ 5,775,200,000		₨ 5,774,800,000
Shares issued			0		400,000
Shares at the end	₨ 5,775,200,000	$ 83.5	₨ 5,775,200,000		₨ 5,775,200,000
'A' Ordinary shares [Member]
Disclosure of classes of share capital [line items]
Shares at the beginning | shares	508,502,371	508,502,371	508,502,291		508,476,704
Shares issued | shares	0	0	80		25,587
Shares at the end | shares	508,502,371	508,502,371	508,502,371		508,502,291
Shares at the beginning	₨ 1,017,000,000		₨ 1,017,000,000		₨ 1,017,000,000
Shares issued			0		0
Shares at the end	₨ 1,017,000,000	$ 14.7	1,017,000,000		₨ 1,017,000,000
'A' Ordinary shares [Member] | Top of range [member]
Disclosure of classes of share capital [line items]
Shares issued			₨ 50,000
[1]	Less than Rs. 50,000

Equity - Additional Information

Equity - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019Vote₨ / sharesshares	Mar. 31, 2018₨ / sharesshares	Mar. 31, 2017₨ / sharesshares
Ordinary shares [Member]
Disclosure of classes of share capital [line items]
Authorized share capital	4,000,000,000	3,500,000,000	3,500,000,000
Par value per share | ₨ / shares	₨ 2	₨ 2	₨ 2
Number of shares issued includes partly paid up shares	570	570	570
'A' Ordinary shares [Member]
Disclosure of classes of share capital [line items]
Authorized share capital	1,000,000,000	1,000,000,000	1,000,000,000
Par value per share | ₨ / shares	₨ 2	₨ 2	₨ 2
Number of votes for every ten 'A' Ordinary share held | Vote	1
Number of 'A' Ordinary share needed for one vote	10
Percentage points more than the aggregate rate of dividend declared on Ordinary shares that 'A' Ordinary shareholders are entitled to	5.00%
Convertible cumulative preference shares [Member]
Disclosure of classes of share capital [line items]
Authorized share capital	300,000,000	300,000,000	300,000,000
Par value per share | ₨ / shares	₨ 100	₨ 100	₨ 100

Other Components of Equity - Su

Other Components of Equity - Summary of Movement of Currency Translation Reserve (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Balance at the beginning	₨ 913,521		₨ 538,842.2
Net change in translation reserve - equity accounted investees (net)	(586.1)	$ (8.5)	4,044.2	₨ (3,047)
Balance at the end	558,067.4	8,069.9	913,521	538,842.2
Currency translation reserve [Member]
Balance at the beginning	49,388.8	714.2	(50,933.2)	45,936.6
Exchange differences arising on translating the net assets of foreign operations (net)	(20,414.1)	(295.2)	96,211.5	(93,822.8)
Net change in translation reserve - equity accounted investees (net)	(586.1)	(8.5)	4,110.5	(3,047)
Balance at the end	₨ 28,388.6	$ 410.5	₨ 49,388.8	₨ (50,933.2)

Other Components of Equity - _2

Other Components of Equity - Summary of Movement of Equity Instruments Held as Fair Value (Detail) - 12 months ended Mar. 31, 2019 ₨ in Millions, $ in Millions	INR (₨)	USD ($)
Balance at the beginning	₨ 913,521
Balance at the end	558,067.4	$ 8,069.9
Equity instruments held as fair value through other comprehensive income [Member]
Effect of transition to IFRS 9 (refer note 2(x))	1,392.8	20.1
Other Comprehensive income for the year	438.1	6.3
Income tax relating to gain/(loss) recognized on equity investments, where applicable	3.9	0.1
Profit on sale of equity investments reclassified to retained earnings	(49.3)	(0.7)
Balance at the end	₨ 1,785.5	$ 25.8

Other Components of Equity - _3

Other Components of Equity - Summary of Movement of Available-for-sale Investments Reserve (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Balance at the beginning	₨ 913,521		₨ 538,842.2
Net change in share of available-for-sale investments reserves - equity accounted investees (net)	(586.1)	$ (8.5)	4,044.2	₨ (3,047)
Balance at the end	558,067.4	8,069.9	913,521	538,842.2
Available-for-sale investments [Member]
Balance at the beginning	1,422.1	20.6	1,062.8	274.6
IFRS 9 transition adjustments (refer note 2(x))	₨ (1,422.1)	$ (20.6)
Gain/(loss) arising on revaluation of available-for-sale investments (net)			565.8	905.6
Income tax relating to gain/loss arising on revaluation of available-for-sale investments (net), where applicable			(16.2)	(16)
Cumulative (gain)/loss reclassified to profit or loss on available-for-sale investments (net)			(169.2)	(143.9)
Income tax relating to cumulative gain/loss reclassified to profit or loss on available-for-sale investments (net), where applicable			45.2	42.5
Net change in share of available-for-sale investments reserves - equity accounted investees (net)			(66.3)
Balance at the end			₨ 1,422.1	₨ 1,062.8

Other Components of Equity - _4

Other Components of Equity - Summary of Movement of Hedging Reserve (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Balance at the beginning	₨ 913,521		₨ 538,842.2
Gain/(loss) recognized on cash flow hedges	(90,571.2)	$ (1,309.7)	106,093.1	₨ (262,959.2)
Balance at the end	558,067.4	8,069.9	913,521	538,842.2
Hedging reserve [Member]
Balance at the beginning	(39,224)	(567.2)	(206,143.3)	(84,860)
Effect of transition to IFRS 9 (refer note 2(x))	(2,819.8)	(40.8)		659.5
Gain/(loss) recognized on cash flow hedges	(89,824.6)	(1,298.9)	104,219.6	(258,874.4)
Income tax relating to gain/loss recognized on cash flow hedges	16,974.8	245.5	(19,598.8)	49,566
(Gain)/loss reclassified to profit or loss	79,903.6	1,155.4	101,603.1	109,106.8
Income tax relating to gain/loss reclassified to profit or loss	(15,181.1)	(219.5)	(19,304.6)	(21,741.2)
Amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges	(12,959.4)	(187.4)
Tax on amount reclassed from Hedge reserve to Inventory on maturity of inventory hedges	2,462.3	35.7
Balance at the end	₨ (60,668.2)	$ (877.2)	₨ (39,224)	₨ (206,143.3)

Other Components of Equity - _5

Other Components of Equity - Summary of Movement of Cost of Hedging Reserve (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Balance at the beginning	₨ 913,521		₨ 538,842.2
Gain/(loss) recognized on cash flow hedges	(90,571.2)	$ (1,309.7)	106,093.1	₨ (262,959.2)
Balance at the end	558,067.4	8,069.9	913,521	538,842.2
Movements of cost of hedging reserve which included time value of options forward element of forward contracts and foreign currency basis spread [Member]
Balance at the beginning	(4,473.1)	(64.7)	(6,704.6)
Effect of transition to IFRS 9 (refer note 2(x))	204.8	3		(3,140.5)
Gain/(loss) recognized on cash flow hedges	(746.6)	(10.8)	1,873.5	(4,084.8)
Income tax relating to gain/loss recognized on cash flow hedges	207.5	3	(398.2)	752.1
(Gain)/loss reclassified to profit or loss	659.3	9.5	933.6	(289.3)
Income tax relating to gain/loss reclassified to profit or loss	(125.3)	(1.8)	(177.4)	57.9
Amounts removed from hedge reserve and recognized in inventory	1,727.8	25
Income tax related to amounts removed from hedge reserve and recognized in inventory	(328.3)	(4.7)
Balance at the end	₨ (2,873.9)	$ (41.5)	₨ (4,473.1)	₨ (6,704.6)

Other Components of Equity - _6

Other Components of Equity - Summary of Other Components of Equity (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Statement of changes in equity [abstract]
Currency translation reserve	₨ 28,388.6	$ 410.5	₨ 49,388.8	₨ (50,933.2)
Available-for-sale investments reserve			1,422.1	1,062.8
Investments reserve	1,785.5	25.8
Hedging reserve	(60,668.2)	(877.2)	(39,224)	(206,143.3)
Cost of hedge reserve	(2,873.9)	(41.6)	(4,473.1)	(6,704.6)
Total	₨ (33,368)	$ (482.5)	₨ 7,113.8	₨ (262,718.3)

Notes to Reserves and Dividen_2

Notes to Reserves and Dividends - Additional Information (Detail) - ₨ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debenture Redemption Reserve percentage	25.00%
Minimum percentage of net profit amount required to be transferred to reserve fund before declaring any dividend	20.00%
Dividend declared	₨ 0	₨ 0	₨ 0
Tata Daewoo Commercial Vehicle Company Limited [Member]
Minimum percentage of cash dividend declared appropriation to legal reserve	10.00%
Percentage of capital stock required until no longer required to appropriate cash dividend declared to legal reserve	50.00%

Revenue - Summary of revenue (D

Revenue - Summary of revenue (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of revenue from contracts with customers [line items]
Sale of Services	₨ 28,091.7	$ 406.2
Others (Incentives) (refer note 2(x))	0	0
Total	2,959,666.9	42,797.6	₨ 2,856,910.8	₨ 2,632,176.8
Vehicles [Member]
Disclosure of revenue from contracts with customers [line items]
- Sale of miscellaneous products	2,576,720.5	37,260.1
Spare Parts [member]
Disclosure of revenue from contracts with customers [line items]
- Sale of miscellaneous products	240,405	3,476.3
Miscellaneous [member]
Disclosure of revenue from contracts with customers [line items]
- Sale of miscellaneous products	₨ 114,449.7	$ 1,655

Employee Cost - Summary of Empl

Employee Cost - Summary of Employee Cost (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Classes of employee benefits expense [abstract]
Salaries, wages and welfare expenses	₨ 317,406	$ 4,589.8	₨ 270,441.8	₨ 255,325.7
Contribution to provident fund and other funds	28,855.1	417.2	32,183	28,262.3
Total	₨ 346,261.1	$ 5,007	₨ 302,624.8	₨ 283,588

Employee Cost - Additional Info

Employee Cost - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019INR (₨)₨ / shares	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number Share Options Granted	7,812,427
Exercise Price of options granted	₨ 345
Employee Stock Options [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Employee cost	₨ 84,400,000
Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Options granted vesting period	3 years
Number of Shares vest per option | ₨ / shares	₨ 0.5
Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Options granted vesting period	5 years
Number of Shares vest per option | ₨ / shares	₨ 1.5
Long Term Incentive Plan [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period of underlying shares	3 year vesting period and continued employment at the end of the vesting period.
Employee cost	₨ 91,800,000	₨ 85,500,000	₨ 701,300,000

Employee Cost - Summary of Equi

Employee Cost - Summary of Equity Settled Share Based Payments (Detail)	12 Months Ended
	Mar. 31, 2019
Disclosure Of Employee Salaries And Benefit Expenses [line items]
Options outstanding at the beginning of the year	0
Granted during the year	7,812,427
Forfeited/Expired during the year	0
Exercised during the year	0
Outstanding at the end of the year	7,812,427
Top of range [member]
Disclosure Of Employee Salaries And Benefit Expenses [line items]
Number of shares to be issued for outstanding options (conditional on performance measures)	11,718,641
Bottom of range [member]
Disclosure Of Employee Salaries And Benefit Expenses [line items]
Number of shares to be issued for outstanding options (conditional on performance measures)	3,906,214

Employee Cost - Summary of Esti

Employee Cost - Summary of Estimated Fair Value of Options Using Black Scholes Model (Detail)	12 Months Ended
	Mar. 31, 2019yr
Bottom of range [member]
Disclosure Of Employee Salaries And Benefit Expenses [line items]
Risk free rate	7.00%
Expected life of option	4
Expected volatility	33.00%
Top of range [member]
Disclosure Of Employee Salaries And Benefit Expenses [line items]
Risk free rate	8.00%
Expected life of option	6
Expected volatility	37.00%

Other Expenses - Summary of Oth

Other Expenses - Summary of Other Expenses (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Expenses by nature [abstract]
Stores, spare parts and tools consumed	₨ 24,441.5	$ 353.4	₨ 22,105.6	₨ 24,191.1
Freight and transportation expenses (refer note 2(x))	78,044.7	1,128.5	114,840.9	103,534.4
Research and product development cost	42,245.7	610.9	35,318.7	34,135.7
Warranty and product liability expenses	118,921.4	1,719.6	69,978.9	85,866.4
Allowance for trade and other receivables, and finance receivables	5,344.3	77.3	400.9	7,359.5
Works operation and other expenses	259,133.9	3,747.1	261,407.3	232,674.8
Repairs to building and plant and machinery	6,115.7	88.4	6,189.7	6,273.2
Processing charges	16,343.6	236.3	13,390.8	11,720.3
Power and fuel	15,859.3	229.3	13,080.8	11,598.2
Insurance	3,552.3	51.4	3,355.9	4,121.2
Publicity	87,296.3	1,262.5	89,685.9	86,986.8
Total	₨ 657,298.7	$ 9,504.7	₨ 629,755.4	₨ 608,461.6

Other Income_(Loss) (Net) - Sum

Other Income/(Loss) (Net) - Summary of Other Income/(Loss) (Net) (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure Of Other Income Loss[abstract]
Miscellaneous income	₨ 16,941.8	$ 245	₨ 32,508	₨ 25,143.9
Incentives	10,035.3	145.1	11,499.6	3,331.1
Gain/(Loss) on change in fair value of commodity derivatives	847.5	12.3	2,146.3	9,184
Dividend income and income on mutual funds	172.8	2.5	157.7	105.1
Gain/(loss) on sale, change in fair value of available-for-sale investments (net)			1,561.7	1,826
Profit on sale of investments measured at FVTPL	1,286.1	18.6
Profit on sale of investment in a subsidiary company (note below)	3,769.8	54.5
MTM on investments measured at FVTPL	2,385.4	34.5
Total	₨ 35,438.7	$ 512.5	₨ 47,873.3	₨ 39,590.1

Interest Expense (Net) - Summar

Interest Expense (Net) - Summary of Interest Expense (Net) (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Interest costs [abstract]
Gross interest expense	₨ 72,714.5	$ 1,051.5	₨ 59,734.5	₨ 55,306.7
Less: Interest capitalized	(15,128.5)	(218.8)	(12,943.2)	(12,941)
Total	₨ 57,586	$ 832.7	₨ 46,791.3	₨ 42,365.7

Interest Expense (Net) - Additi

Interest Expense (Net) - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Interest costs [abstract]
Weighted average rate for capitalization of interest relating to general borrowings	5.40%	4.30%	4.40%

Employee Benefits - Summary of

Employee Benefits - Summary of Change in Defined Benefit Obligations for Pension and Post Retirement Medical Plans (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Pension benefits [Member]
Change in defined benefit obligations :
Current service cost	₨ 746.3	$ 10.8	₨ 722.5	₨ 657.1
Interest cost	41	0.5	54.3	94.6
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions	(11.9)	(0.2)	(160.3)	(9.6)
Actuarial (gains) / losses arising from changes in financial assumptions	141.9	2.1	228.8	160.1
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	592.7	8.6	105	(65)
Pension benefits [Member] | Present value of defined benefit obligation [Member]
Change in defined benefit obligations :
Beginning of the year	10,247.9	148.2	9,807.6
Current service cost	746.3	10.8	722.5
Interest cost	757	10.9	687.6
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions	(11.9)	(0.2)	(160.3)
Actuarial (gains) / losses arising from changes in financial assumptions	141.9	2.1	228.8
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	592.7	8.6	105
Benefits paid from plan assets	(713.1)	(10.3)	(1,168.5)
Benefits paid directly by employer	(58.2)	(0.8)	(59.8)
Past service cost plan amendment	3.9	0.1	85
Acquisition/(Divestment)	(23.9)	(0.3)
End of the year	11,682.6	169.1	10,247.9	9,807.6
Post retirement medical benefits [Member]
Change in defined benefit obligations :
Current service cost	80.4	1.2	102	81.9
Interest cost	115.1	1.6	130.6	123.3
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions			(114)	21.7
Actuarial (gains) / losses arising from changes in financial assumptions	81.1	1.2	(27)	218.2
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(150.3)	(2.2)	(289.6)	(104.6)
Post retirement medical benefits [Member] | Present value of defined benefit obligation [Member]
Change in defined benefit obligations :
Beginning of the year	1,540.5	22.3	1,838.6
Current service cost	80.4	1.2	102
Interest cost	115.1	1.7	130.6
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions			(114)
Actuarial (gains) / losses arising from changes in financial assumptions	81.1	1.2	(27)
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(150.3)	(2.2)	(289.6)
Benefits paid directly by employer	(94.2)	(1.4)	(100.1)
Past service cost plan amendment	(19.9)	(0.3)
Acquisition/(Divestment)	(18.7)	(0.3)
End of the year	₨ 1,534	$ 22.2	₨ 1,540.5	₨ 1,838.6

Employee Benefits - Summary o_2

Employee Benefits - Summary of Change in Plan Assets for Pension and Post Retirement Medical Plans (Detail) - Pension benefits [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Interest income	₨ (41)	$ (0.5)	₨ (54.3)	₨ (94.6)
Remeasurements
Return on plan assets, (excluding amount included in net Interest cost)	27	0.4	(26.9)	264.1
Plan assets [Member]
Disclosure of defined benefit plans [line items]
Beginning of the year	9,060.4	131.1	8,417.8
Interest income	716	10.4	633.3
Remeasurements
Return on plan assets, (excluding amount included in net Interest cost)	27	0.4	(26.9)
Employer's contributions	1,172.6	17	1,204.7
Benefits paid	(713.1)	(10.3)	(1,168.5)
Acquisition/(Divestment)	(12.5)	(0.2)
End of the year	₨ 10,250.4	$ 148.4	₨ 9,060.4	₨ 8,417.8

Employee Benefits - Summary o_3

Employee Benefits - Summary of Amount Recognized in the Balance Sheet for Pension and Post Retirement Medical Plans (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of defined benefit plans [line items]
Non-current assets	₨ 16.4		₨ 15.7
Pension benefits [Member]
Disclosure of defined benefit plans [line items]
Present value of defined benefit obligation	11,682.6	$ 169.1	10,247.9
Fair value of plan assets	10,250.4	148.4	9,060.4
Net liability	(1,432.2)	(20.7)	(1,187.5)
Non-current assets	16.4	0.2	15.7
Non-current liabilities	(1,448.6)	(20.9)	(1,069.8)
Liabilities for assets classified as held for sale			(133.4)
Net liability	(1,432.2)	(20.7)	(1,187.5)
Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Present value of defined benefit obligation	1,534	22.2	1,540.5
Net liability	(1,534)	(22.2)	(1,540.5)
Non-current liabilities	(1,534)	(22.2)	(1,420.1)
Liabilities for assets classified as held for sale			(120.4)
Net liability	₨ (1,534)	$ (22.2)	₨ (1,540.5)

Employee Benefits - Summary o_4

Employee Benefits - Summary of Amount Recognized in Other Comprehensive Income for Pension and Post Retirement Medical Plans (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Pension benefits [Member]
Disclosure of defined benefit plans [line items]
Remeasurements (gains)/losses	₨ 3,068.2	$ 44.4	₨ 2,372.5	₨ 2,172.1
Remeasurements (gains)/losses	(3,068.2)	(44.4)	(2,372.5)	(2,172.1)
Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Remeasurements (gains)/losses	120.9	1.7	51.7	(378.9)
Post retirement medical benefits [Member] | Reserve of remeasurements of defined benefit plans [member]
Disclosure of defined benefit plans [line items]
Remeasurements (gains)/losses	₨ (120.9)	$ (1.7)	₨ (51.7)	₨ 378.9

Employee Benefits - Summary o_5

Employee Benefits - Summary of Information for Funded and Unfunded Plans for Pension and Post Retirement Medical Plans (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Pension benefits [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	₨ 11,682.6	$ 169.1	₨ 10,247.9
Fair value of plan assets	10,250.4	148.4	9,060.4
Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	1,534	22.2	1,540.5
Funded Plans [member] | Pension benefits [Member] | Defined benefit obligation in excess of plan assets [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	9,837	142.2	1,410.8
Fair value of plan assets	9,612.3	139	1,262.9
Funded Plans [member] | Pension benefits [Member] | Defined benefit obligation less than plan assets [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	621.7	9	7,781.8
Fair value of plan assets	638.1	9.2	7,797.5
Unfunded plans [Member] | Pension benefits [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	1,223.9	17.7	1,055.3
Unfunded plans [Member] | Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation	₨ 1,534	$ 22.2	₨ 1,540.5

Employee Benefits - Summary o_6

Employee Benefits - Summary of Net Pension and Post Retirement Medical Cost (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Past Service cost- Plan amendment	₨ (1,479.3)	$ (21.4)	₨ 36,090.1
Pension benefits [Member]
Disclosure of defined benefit plans [line items]
Service cost	746.3	10.8	722.5	₨ 657.1
Past Service cost- Plan amendment	3.9	0.1	85
Net interest cost / (income)	41	0.5	54.3	94.6
Net periodic cost	791.2	11.4	861.8	751.7
Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Service cost	80.4	1.2	102	81.9
Past Service cost- Plan amendment	(19.9)	(0.3)
Net interest cost / (income)	115.1	1.6	130.6	123.3
Net periodic cost	₨ 175.6	$ 2.5	₨ 232.6	₨ 205.2

Employee Benefits - Summary o_7

Employee Benefits - Summary of Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Remeasurements
Total recognized in other comprehensive income	₨ (25,612.6)	$ (370.4)	₨ 46,751	₨ (78,045)
Pension benefits [Member]
Remeasurements
Return on plan assets, (excluding amount included in net Interest expense)	(27)	(0.4)	26.9	(264.1)
Actuarial (gains) / losses arising from changes in demographic assumptions	(11.9)	(0.2)	(160.3)	(9.6)
Actuarial (gains) / losses arising from changes in financial assumptions	141.9	2.1	228.8	160.1
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	592.7	8.6	105	(65)
Total recognized in other comprehensive income	695.7	10.1	200.4	(178.6)
Total recognized in income statement and statement of other comprehensive income	1,486.9	21.5	1,062.2	573.1
Post retirement medical benefits [Member]
Remeasurements
Actuarial (gains) / losses arising from changes in demographic assumptions			(114)	21.7
Actuarial (gains) / losses arising from changes in financial assumptions	81.1	1.2	(27)	218.2
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(150.3)	(2.2)	(289.6)	(104.6)
Total recognized in other comprehensive income	(69.2)	(1)	(430.6)	135.3
Total recognized in income statement and statement of other comprehensive income	₨ 106.4	$ 1.5	₨ (198)	₨ 340.5

Employee Benefits - Summary o_8

Employee Benefits - Summary of Assumptions Used in Accounting for Pension and Post Retirement Medical Plans (Detail)	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate			7.50%
Rate of increase in compensation level of covered employees			11.00%
Pension benefits [Member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	6.75%	7.50%	6.75%
Rate of increase in compensation level of covered employees	5.75%	5.00%	4.00%
Pension benefits [Member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	7.70%	8.00%
Rate of increase in compensation level of covered employees	12.00%	12.00%
Post retirement medical benefits [Member]
Disclosure of defined benefit plans [line items]
Discount rate	7.60%	8.00%	7.30%
Increase in health care cost	6.00%	6.00%	6.00%

Employee Benefits - Summary o_9

Employee Benefits - Summary of Fair Value of Company's Pension Plan Assets (Detail) - Pension benefits [Member]	Mar. 31, 2019	Mar. 31, 2018
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	6.50%	6.00%
Deposits with Insurance companies	23.10%	23.60%
Total	100.00%	100.00%
Level 1 [Member]
Disclosure of fair value of plan assets [line items]
Debt instruments	66.90%	68.40%
Equity instruments (quoted)	2.60%	1.70%
Level 2 and 3 of fair value hierarchy [Member]
Disclosure of fair value of plan assets [line items]
Debt instruments	0.90%	0.30%

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) ₨ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)yr	Mar. 31, 2019USD ($)yr	Mar. 31, 2019GBP (£)yr	Mar. 31, 2018INR (₨)yr	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Defined benefit pension plan amendment cost/(credit)	₨ (1,479.3)	$ (21.4)		₨ 36,090.1
Contribution to defined contribution plans	₨ 11,862.1			₨ 8,995.9	₨ 7,549.5
Pension and post retirement medical plans [Member]
Disclosure of defined benefit plans [line items]
Weighted average duration of defined benefit obligation | yr	14.41	14.41	14.41	14.51
Expected contributions to funded plans in Fiscal 2020	₨ 966.7
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Disclosure of defined benefit plans [line items]
Weighted average duration of defined benefit obligation | yr	11	11	11	10.7
Expected contributions to funded plans in Fiscal 2020	₨ 179.1
Jaguar Pension Plan [Member] | Males [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					120.00%
Jaguar Pension Plan [Member] | Males [Member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	112.00%	112.00%	112.00%	113.00%
Jaguar Pension Plan [Member] | Males [Member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	118.00%	118.00%	118.00%	119.00%
Jaguar Pension Plan [Member] | Females [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					110.00%
Jaguar Pension Plan [Member] | Females [Member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	101.00%	101.00%	101.00%	102.00%
Jaguar Pension Plan [Member] | Females [Member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	112.00%	112.00%	112.00%	114.00%
Land Rover Pension Scheme [Member] | Males [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					115.00%
Land Rover Pension Scheme [Member] | Males [Member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	107.00%	107.00%	107.00%	108.00%
Land Rover Pension Scheme [Member] | Males [Member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	112.00%	112.00%	112.00%	113.00%
Land Rover Pension Scheme [Member] | Females [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					105.00%
Land Rover Pension Scheme [Member] | Females [Member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	103.00%	103.00%	103.00%	102.00%
Land Rover Pension Scheme [Member] | Females [Member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	109.00%	109.00%	109.00%	111.00%
Jaguar Executive Pension Plan [Member] | Males [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					95.00%
Jaguar Executive Pension Plan [Member] | Males [Member] | Weighted Average [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	94.00%	94.00%	94.00%	95.00%
Jaguar Executive Pension Plan [Member] | Females [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor					85.00%
Jaguar Executive Pension Plan [Member] | Females [Member] | Weighted Average [Member]
Disclosure of defined benefit plans [line items]
Mortality assumptions scaling factor	84.00%	84.00%	84.00%	85.00%
Jaguar Land Rover Pension plan [member]
Disclosure of defined benefit plans [line items]
Weighted average duration of defined benefit obligation | yr	19	19	19	20.04
Expected contributions to funded plans in Fiscal 2020	₨ 20,187.3
Allowance for long term improvements, per annum	1.25%	1.25%	1.25%
Intended period to eliminate the pension scheme funding deficits	10 years	10 years	10 years
Contribution rate for defined benefit accrual	31.00%	31.00%	31.00%
Expected net periodic pension cost	₨ 15,042.8
Defined benefit pension plan amendment cost/(credit)	₨ 3,799	$ 54.9	£ 16.5	₨ (36,090.1)
Jaguar Land Rover Pension plan [member] | Level 1 [Member]
Disclosure of defined benefit plans [line items]
Percentage of fair value of plan assets	62.00%	62.00%	62.00%	71.00%
Jaguar Land Rover Pension plan [member] | Level 2 [Member]
Disclosure of defined benefit plans [line items]
Percentage of fair value of plan assets	24.00%	24.00%	24.00%	20.00%
Jaguar Land Rover Pension plan [member] | Level 3 [Member]
Disclosure of defined benefit plans [line items]
Percentage of fair value of plan assets	14.00%	14.00%	14.00%	9.00%
Jaguar Land Rover Automotive Plc [Member]
Disclosure of defined benefit plans [line items]
Defined benefit pension plan amendment cost/(credit)				₨ 36,090.1

Employee Benefits - Summary _10

Employee Benefits - Summary of Sensitivity Analysis for Pension and Post Retirement Medical Plans (Detail) - Pension and post retirement medical plans [Member] ₨ in Millions	Mar. 31, 2019INR (₨)
Discount rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1.00%
Change in assumption, decrease	1.00%
Impact on defined benefit obligation, due to increase in assumption	₨ (845.5)
Impact on defined benefit obligation, due to decrease in assumption	951.2
Impact on service cost and interest cost, due to increase in assumption	(193.4)
Impact on service cost and interest cost, due to decrease in assumption	₨ 206.2
Salary escalation rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1.00%
Change in assumption, decrease	1.00%
Impact on defined benefit obligation, due to increase in assumption	₨ 913.1
Impact on defined benefit obligation, due to decrease in assumption	(810.2)
Impact on service cost and interest cost, due to increase in assumption	216.6
Impact on service cost and interest cost, due to decrease in assumption	₨ (190.3)
Health care cost [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1.00%
Change in assumption, decrease	1.00%
Impact on defined benefit obligation, due to increase in assumption	₨ 193.4
Impact on defined benefit obligation, due to decrease in assumption	(162.6)
Impact on service cost and interest cost, due to increase in assumption	42.7
Impact on service cost and interest cost, due to decrease in assumption	₨ (39.7)

Employee Benefits - Summary _11

Employee Benefits - Summary of Change in Defined Benefit Obligation for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Service cost	₨ 525.2	$ 7.6	₨ 452.6	₨ 486.2
Interest cost	1.6		(2.5)	7.6
Remeasurements
Actuarial (gains) / losses arising from changes in financial assumptions	368.3	5.3	(1.4)	(156.5)
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(213.4)	(3.1)	147	(195.3)
Present value of defined benefit obligation [Member]
Disclosure of defined benefit plans [line items]
Beginning of the year	4,256.3	61.5	3,482.6
Service cost	525.2	7.6	452.6
Interest cost	111.3	1.6	79
Remeasurements
Actuarial (gains) / losses arising from changes in financial assumptions	368.3	5.3	(1.4)
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(213.4)	(3.1)	147
Benefits paid from plan assets	(738.9)	(10.7)	(70.8)
Benefits paid directly by employer	(89.5)	(1.3)	(34.9)
Foreign currency translation	4	0.1	202.2
End of the year	₨ 4,223.3	$ 61	₨ 4,256.3	₨ 3,482.6

Employee Benefits - Summary _12

Employee Benefits - Summary of Change in Plan Assets for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Interest income	₨ (1.6)		₨ 2.5	₨ (7.6)
Remeasurements
Return on plan assets, (excluding amount included in net Interest expense)	59.9	$ 0.9	51.3	25.4
Plan assets [Member]
Disclosure of defined benefit plans [line items]
Beginning of the year	4,053.6	58.6	3,245.3
Interest income	109.7	1.6	81.5
Remeasurements
Return on plan assets, (excluding amount included in net Interest expense)	(59.9)	(0.9)	(51.3)
Employer's contributions	219.7	3.2	656.4
Benefits paid	(738.9)	(10.7)	(70.8)
Foreign currency translation	16.5	0.2	192.5
End of the year	₨ 3,600.7	$ 52	₨ 4,053.6	₨ 3,245.3

Employee Benefits - Summary _13

Employee Benefits - Summary of Amount Recognized in the Balance Sheet for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of defined benefit plans [line items]
Non- current liabilities	₨ (61,101.2)	$ (883.5)	₨ (41,007.6)
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Disclosure of defined benefit plans [line items]
Present value of defined benefit obligation	4,223.3	61	4,256.3
Fair value of plan assets	3,600.7	52	4,053.6
Net liability	(622.6)	(9)	(202.7)
Non- current liabilities	₨ (622.6)	$ (9)	₨ (202.7)

Employee Benefits - Summary _14

Employee Benefits - Summary of Amount Recognized in Other Comprehensive Income for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Remeasurements (gains)/losses	₨ (396.3)	$ (5.7)	₨ (611.1)	₨ (808)
Total amount recognized in other comprehensive income	₨ (396.3)	$ (5.7)	₨ (611.1)	₨ (808)

Employee Benefits - Summary _15

Employee Benefits - Summary of Net Severance Indemnity Cost for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of net defined benefit liability (asset) [line items]
Service cost	₨ 525.2	$ 7.6	₨ 452.6	₨ 486.2
Net interest cost	1.6		(2.5)	7.6
Net periodic cost	₨ 526.8	$ 7.6	₨ 450.1	₨ 493.8

Employee Benefits - Summary _16

Employee Benefits - Summary of Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Remeasurements
Total recognized in other comprehensive income	₨ (25,612.6)	$ (370.4)	₨ 46,751	₨ (78,045)
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Remeasurements
Return on plan assets, (excluding amount included in net Interest expense)	59.9	0.9	51.3	25.4
Actuarial (gains) / losses arising from changes in financial assumptions	368.3	5.3	(1.4)	(156.5)
Actuarial (gains) / losses arising from changes in experience adjustments on plan liabilities	(213.4)	(3.1)	147	(195.3)
Total recognized in other comprehensive income	214.8	3.1	196.9	(326.4)
Total recognized in income statement and other comprehensive income	₨ 741.6	$ 10.7	₨ 647	₨ 167.4

Employee Benefits - Summary _17

Employee Benefits - Summary of Assumptions Used in Accounting for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of defined benefit plans [line items]
Discount rate	2.00%	2.80%	2.30%
Rate of increase in compensation level of covered employees	3.50%	3.50%	3.00%

Employee Benefits - Summary _18

Employee Benefits - Summary of Sensitivity Analysis for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail) - Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member] ₨ in Millions	Mar. 31, 2019INR (₨)
Discount rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1.00%
Change in assumption, decrease	1.00%
Impact on scheme liabilities, due to increase in assumption	₨ (440.1)
Impact on scheme liabilities, due to decrease in assumption	516.2
Impact on service cost and interest cost, due to increase in assumption	(123.2)
Impact on service cost and interest cost, due to decrease in assumption	₨ 135.6
Salary escalation rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1.00%
Change in assumption, decrease	1.00%
Impact on scheme liabilities, due to increase in assumption	₨ 503
Impact on scheme liabilities, due to decrease in assumption	(438.2)
Impact on service cost and interest cost, due to increase in assumption	148.6
Impact on service cost and interest cost, due to decrease in assumption	₨ (128.4)

Employee Benefits - Summary _19

Employee Benefits - Summary of Plan Assets Allocation by Category for Tata Daewoo Commercial Vehicles Limited Severance Indemnity Plan (Detail)	Mar. 31, 2019	Mar. 31, 2018
Severance indemnity of Tata Daewoo Commercial Vehicles Limited [Member]
Disclosure of defined benefit plans [line items]
Deposit with banks	100.00%	100.00%

Employee Benefits - Summary _20

Employee Benefits - Summary of Change in Plan Assets for Jaguar Land Rover Limited Pension Plan (Detail) ₨ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2019GBP (£)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Remeasurements
Defined benefit pension plan amendment cost/(credit)	₨ (1,479.3)	$ (21.4)		₨ 36,090.1
Jaguar Land Rover Pension plan [member]
Disclosure of defined benefit plans [line items]
Beginning of the year	40,421.5
Service cost	14,490.5	209.5		18,561.3	₨ 17,357.3
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions	(4,533.1)	(65.5)		(17,990.4)	(6,662.4)
Return on plan assets, (excluding amount included in net Interest expense)	23,626.2	341.6		(9,974.6)	100,724.9
Actuarial (gains)/losses arising from changes in financial assumptions	49,653.7	718		(30,177.8)	204,693.3
Actuarial (gains)/losses arising from changes in experience adjustments on plan liabilities	3,276.9	47.4		(8,487.5)	(18,672.2)
Defined benefit pension plan amendment cost/(credit)	3,799	54.9	£ 16.5	(36,090.1)
Plan settlement				58.1
End of the year	60,263.9	871.5		40,421.5
Jaguar Land Rover Pension plan [member] | Present value of defined benefit obligation [Member]
Disclosure of defined benefit plans [line items]
Beginning of the year	767,800.4	11,102.6		806,676.9
Service cost	14,490.5	209.5		18,561.3
Interest cost	19,814.7	286.5		20,584.3
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions	(4,533.1)	(65.5)		(17,990.4)
Actuarial (gains)/losses arising from changes in financial assumptions	49,653.7	718		(30,177.8)
Actuarial (gains)/losses arising from changes in experience adjustments on plan liabilities	3,276.9	47.4		(8,487.5)
Defined benefit pension plan amendment cost/(credit)	3,799	54.9		(36,090.1)
Plan settlement				(1,807.6)
Benefits paid	(56,573.7)	(818.1)		(84,441.3)
Member contributions	135.8	2		324.8
Foreign currency translation	(15,199.3)	(219.8)		100,647.8
End of the year	782,664.9	11,317.5		767,800.4	806,676.9
Jaguar Land Rover Pension plan [member] | Plan assets [Member]
Disclosure of defined benefit plans [line items]
Beginning of the year	(727,378.9)	(10,518.1)		(688,454.9)
Interest cost	(19,040.2)	(275.3)		(18,661.3)
Remeasurements
Return on plan assets, (excluding amount included in net Interest expense)	23,626.2	341.6		(9,974.6)
Employer's contributions	24,078.1	348.2		24,554.2
Plan settlement				(1,749.5)
Benefits paid	(56,573.7)	(818.1)		(84,441.3)
Member contributions	135.8	2		324.8
Expenses paid	(1,186.5)	(17.2)		(777.7)
Foreign currency translation	(14,098)	(203.9)		92,326.9
End of the year	₨ (722,401)	$ (10,446)		₨ (727,378.9)	₨ (688,454.9)

Employee Benefits - Summary _21

Employee Benefits - Summary of Amount Recognized in the Balance Sheet for Jaguar Land Rover Limited Pension Plan (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of defined benefit plans [line items]
Non- current assets	₨ 16.4		₨ 15.7
Non -current liabilities	(61,101.2)	$ (883.5)	(41,007.6)
Jaguar Land Rover Pension plan [member]
Disclosure of defined benefit plans [line items]
Present value of defined benefit obligation	782,664.9	11,317.5	767,800.4
Fair value of plan assets	722,401	10,446	727,378.9
Net liability	(60,263.9)	(871.5)	(40,421.5)
Non- current assets	0	0	0
Non -current liabilities	(60,263.9)	(871.5)	(40,421.5)
Net liability	₨ (60,263.9)	$ (871.5)	₨ (40,421.5)

Employee Benefits - Summary _22

Employee Benefits - Summary of Total Amount Recognized in Other Comprehensive Income for Jaguar Land Rover Limited Pension Plan (Detail) - Jaguar Land Rover Pension plan [member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Remeasurements (gains)/losses	₨ 152,983.4	$ 2,212.2	₨ 128,212.1	₨ 174,893.2
Restriction of Pension asset (as per IFRIC 14)	(13,928.1)	(201.4)	(13,928.1)	(13,928.1)
Onerous obligation, excluding amounts included in interest expenses	(8,650.4)	(125.1)	(8,650.4)	(8,650.4)
Total amount recognized in other comprehensive income	₨ 130,404.9	$ 1,885.7	₨ 105,633.6	₨ 152,314.7

Employee Benefits - Summary _23

Employee Benefits - Summary of Net Pension and Post Retirement Cost for Jaguar Land Rover Limited Pension Plan (Detail) ₨ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2019GBP (£)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of defined benefit plans [line items]
Defined benefit pension plan amendment cost/(credit)	₨ (1,479.3)	$ (21.4)		₨ 36,090.1
Jaguar Land Rover Pension plan [member]
Disclosure of defined benefit plans [line items]
Current service cost	14,490.5	209.5		18,561.3	₨ 17,357.3
Defined benefit pension plan amendment cost/(credit)	3,799	54.9	£ 16.5	(36,090.1)
Administrative expenses	1,186.5	17.2		777.7	789
Plan settlement				(58.1)
Net interest cost / (income) (including onerous obligations)	774.5	11.2		1,923	1,490.3
Net periodic pension cost	₨ 20,250.5	$ 292.8		₨ (14,886.2)	₨ 19,636.6

Employee Benefits - Summary _24

Employee Benefits - Summary of Amount Recognized in Other Comprehensive Income for Jaguar Land Rover Limited Pension Plan (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Remeasurements
Total recognized in other comprehensive income	₨ (25,612.6)	$ (370.4)	₨ 46,751	₨ (78,045)
Jaguar Land Rover Pension plan [member]
Remeasurements
Actuarial (gains)/losses arising from changes in demographic assumptions	(4,533.1)	(65.5)	(17,990.4)	(6,662.4)
Actuarial (gains)/losses arising from changes in financial assumptions	49,653.7	718	(30,177.8)	204,693.3
Actuarial (gains)/losses arising from changes in experience adjustments on plan liabilities	3,276.9	47.4	(8,487.5)	(18,672.2)
Return on plan assets, (excluding amount included in net Interest expense)	(23,626.2)	(341.6)	9,974.6	(100,724.9)
Change in onerous obligation, excluding amounts included in interest expenses				(175.3)
Total recognized in other comprehensive income	24,771.3	358.3	(46,681.1)	78,458.5
Total recognized in income statement and statement of other comprehensive income	₨ 45,021.8	$ 651.1	₨ (61,567.3)	₨ 98,095.1

Employee Benefits - Summary _25

Employee Benefits - Summary of Assumptions Used in Accounting for Jaguar Land Rover Limited Pension Plan (Detail) - Jaguar Land Rover Pension plan [member] - yr	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of defined benefit plans [line items]
Discount rate	2.40%	2.70%	2.60%
Expected rate of increase in compensation level of covered employees	2.40%	2.30%	3.70%
Inflation increase	3.20%	3.10%	3.20%
Retiring today [Member] | Males [Member]
Disclosure of defined benefit plans [line items]
Assumed life expectations on retirement at age 65 are (years)	21	21.3	21.5
Retiring today [Member] | Females [Member]
Disclosure of defined benefit plans [line items]
Assumed life expectations on retirement at age 65 are (years)	23.2	23.4	24.5
Retiring in 20 years [Member] | Males [Member]
Disclosure of defined benefit plans [line items]
Assumed life expectations on retirement at age 65 are (years)	22.4	22.5	23.3
Retiring in 20 years [Member] | Females [Member]
Disclosure of defined benefit plans [line items]
Assumed life expectations on retirement at age 65 are (years)	25.1	25.1	26.3

Employee Benefits - Summary _26

Employee Benefits - Summary of Plan Assets Allocation by Category for Jaguar Land Rover Limited Pension Plan (Detail) - Jaguar Land Rover Pension plan [member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of defined benefit plans [line items]
Equity instruments	₨ 46,385.2		₨ 78,626.5
Debt instruments	449,366.3		576,871.2
Property funds	42,876.2		29,992.5
Cash and Cash equivalents	19,047.9		20,109.4
Other	133,575.2		119,416.3
Derivatives	31,150.2		21,133.3
Collateralized debt obligations			(118,770.3)
Total	722,401	$ 10,446	727,378.9
United Kingdom [Member]
Disclosure of defined benefit plans [line items]
Property funds	22,112.6		15,227
Technology [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	7,166.5		12,181.6
Energy [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	3,047.5		5,167.9
Manufacturing [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	5,223		8,859.3
Financial [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	8,224.1		13,935
Other instruments at fair value asset [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	22,724.1		38,482.7
Property funds	20,763.6		14,765.5
Government bonds [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	227,093.5		351,696.7
Corporate bonds (investment grade) [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	166,800.2		171,280.3
Corporate bonds (non-investment grade) [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	55,472.6		53,894.2
Hedge funds [Member]
Disclosure of defined benefit plans [line items]
Other	28,032.9		32,853.3
Private market [Member]
Disclosure of defined benefit plans [line items]
Other	30,774.6		23,440.3
Alternatives [Member]
Disclosure of defined benefit plans [line items]
Other	74,767.7		63,122.7
Foreign exchange contracts [Member]
Disclosure of defined benefit plans [line items]
Derivatives	1,478.2		92.3
Interest Rate and Inflation [Member]
Disclosure of defined benefit plans [line items]
Derivatives	29,672		21,041
Level 1 [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	46,385.2		78,626.5
Debt instruments	240,613.3		353,542.4
Cash and Cash equivalents	19,047.9		20,109.4
Other	1,776.4		43,558.4
Total	307,822.8		495,836.7
Level 1 [Member] | Technology [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	7,166.5		12,181.6
Level 1 [Member] | Energy [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	3,047.5		5,167.9
Level 1 [Member] | Manufacturing [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	5,223		8,859.3
Level 1 [Member] | Financial [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	8,224.1		13,935
Level 1 [Member] | Other instruments at fair value asset [Member]
Disclosure of defined benefit plans [line items]
Equity instruments	22,724.1		38,482.7
Level 1 [Member] | Government bonds [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	227,093.5		351,696.7
Level 1 [Member] | Corporate bonds (investment grade) [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	13,519.8		1,845.7
Level 1 [Member] | Private market [Member]
Disclosure of defined benefit plans [line items]
Other	381.7		184.6
Level 1 [Member] | Alternatives [Member]
Disclosure of defined benefit plans [line items]
Other	1,394.7		43,373.8
Level 2 and 3 of fair value hierarchy [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	208,753		223,328.8
Property funds	42,876.2		29,992.5
Other	131,798.8		75,857.9
Derivatives	31,150.2		21,133.3
Collateralized debt obligations			(118,770.3)
Total	414,578.2		231,542.2
Level 2 and 3 of fair value hierarchy [Member] | United Kingdom [Member]
Disclosure of defined benefit plans [line items]
Property funds	22,112.6		15,227
Level 2 and 3 of fair value hierarchy [Member] | Other instruments at fair value asset [Member]
Disclosure of defined benefit plans [line items]
Property funds	20,763.6		14,765.5
Level 2 and 3 of fair value hierarchy [Member] | Corporate bonds (investment grade) [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	153,280.4		169,434.6
Level 2 and 3 of fair value hierarchy [Member] | Corporate bonds (non-investment grade) [Member]
Disclosure of defined benefit plans [line items]
Debt instruments	55,472.6		53,894.2
Level 2 and 3 of fair value hierarchy [Member] | Hedge funds [Member]
Disclosure of defined benefit plans [line items]
Other	28,032.9		32,853.3
Level 2 and 3 of fair value hierarchy [Member] | Private market [Member]
Disclosure of defined benefit plans [line items]
Other	30,392.9		23,255.7
Level 2 and 3 of fair value hierarchy [Member] | Alternatives [Member]
Disclosure of defined benefit plans [line items]
Other	73,373		19,748.9
Level 2 and 3 of fair value hierarchy [Member] | Foreign exchange contracts [Member]
Disclosure of defined benefit plans [line items]
Derivatives	1,478.2		92.3
Level 2 and 3 of fair value hierarchy [Member] | Interest Rate and Inflation [Member]
Disclosure of defined benefit plans [line items]
Derivatives	₨ 29,672		₨ 21,041

Employee Benefits - Summary _27

Employee Benefits - Summary of Sensitivity Analysis for Jaguar Land Rover Limited Pension Plan (Detail) - Jaguar Land Rover Pension plan [member] ₨ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)
Discount rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	0.25%
Change in assumption, decrease	0.25%
Impact on scheme liabilities, due to increase in assumption	₨ 38,521.3
Impact on scheme liabilities, due to decrease in assumption	(38,521.3)
Impact on service cost, due to increase in assumption	731.6
Impact on service cost, due to decrease in assumption	₨ (761.6)
Actuarial assumption of expected rates of inflation [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	0.25%
Change in assumption, decrease	0.25%
Impact on scheme liabilities, due to increase in assumption	₨ 33,398.4
Impact on scheme liabilities, due to decrease in assumption	(33,398.4)
Impact on service cost, due to increase in assumption	724.9
Impact on service cost, due to decrease in assumption	₨ (724.9)
Mortality rates [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	1 year
Change in assumption, decrease	1 year
Impact on scheme liabilities, due to increase in assumption	₨ 27,732.4
Impact on scheme liabilities, due to decrease in assumption	(27,732.4)
Impact on service cost, due to increase in assumption	468
Impact on service cost, due to decrease in assumption	₨ (468)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2019USD ($)
Commitments and contingencies [line items]
Various contracts with vendors and contractors for the acquisition of plant and machinery, equipment and various civil contracts of a capital nature	₨ 115,292	₨ 100,187
Various contracts with vendors and contractors for the acquisition of intangible assets of a capital nature	5,676	5,814
Motor vehicles [member]
Commitments and contingencies [line items]
Tax possession amount	369
Fiat India Automobiles Pvt Ltd, [member]
Commitments and contingencies [line items]
Refund of VAT held	516
Investments accounted for using equity method [member]
Commitments and contingencies [line items]
Various contracts with vendors and contractors for the acquisition of plant and machinery, equipment and various civil contracts of a capital nature	284	127
Tata Advances Systems Ltd [member]
Commitments and contingencies [line items]
Performance guarantee amount	6,915		$ 100
Chery Jaguar Land Rover Automotive Co. Limited [member]
Commitments and contingencies [line items]
Committed to contribute under the joint venture agreement	36,064	36,221
Amount contributed under the joint venture agreement	29,624	29,753
Outstanding commitment under the joint venture agreement	6,440	6,468
Income tax contingent liability [member]
Commitments and contingencies [line items]
Estimated effect of contingency	5,410
Income tax contingent liability [member] | Investments accounted for using equity method [member]
Commitments and contingencies [line items]
Estimated effect of contingency	772	22
Customs, excise duty and service tax contingent liability [member]
Commitments and contingencies [line items]
Estimated effect of contingency	10,240	16,717
Customs, excise duty and service tax contingent liability [member] | Investments accounted for using equity method [member]
Commitments and contingencies [line items]
Estimated effect of contingency	61	50
Customs, excise duty and service tax demands for more [member]
Commitments and contingencies [line items]
Threshold amount of major contingency cases	200
Excise Authorities raised demand on account of alleged undervaluation's of ex-factory discounts given by Company on passenger vehicles through invoices [member]
Commitments and contingencies [line items]
Estimated effect of contingency	907	907
Excise Authorities raised demand and penalty due to the classification of certain chassis [member]
Commitments and contingencies [line items]
Estimated effect of contingency	2,432	2,399
Excise Authorities denied CENVAT credit claimed by the Company from Fiscal 1992 to Fiscal 2013 [member]
Commitments and contingencies [line items]
Estimated effect of contingency	190	360
Excise Authorities levied penalties and interest with respect to CENVAT credit claimed by the Company from March 2010 to November 2012 [Member]
Commitments and contingencies [line items]
Estimated effect of contingency	903	6,799
Excise Authorities raised demand on pre-delivery inspection charges and free after-sales service charges incurred by dealers [Member]
Commitments and contingencies [line items]
Estimated effect of contingency	295	295
Exicse authorities confirmed demand penalty towards vehicles sold below cost of production with intention to penetrate market [member]
Commitments and contingencies [line items]
Estimated effect of contingency	909	909
Excise Authorities Raised Demand and Penalty on Account of Alleged Undervaluation of Product [member]
Commitments and contingencies [line items]
Estimated effect of contingency	912
Excise Authorities Raised Demand and Penalty on Account of Alleged Non Payment of Service Tax [member]
Commitments and contingencies [line items]
Estimated effect of contingency	235
Sales Tax Authorities Have Given in Appeal in Case of Export of Chassis Offers Body Building [member]
Commitments and contingencies [line items]
Estimated effect of contingency	1,488
Other taxes and dues contingent liability [member]
Commitments and contingencies [line items]
Estimated effect of contingency	4,516	3,670
Other taxes and dues contingent liability [member] | Investments accounted for using equity method [member]
Commitments and contingencies [line items]
Estimated effect of contingency	168	18
Other Taxes and Dues demands for more [member]
Commitments and contingencies [line items]
Threshold amount of major contingency cases	200
Municipal authorities raised demand for higher octroi duties [member]
Commitments and contingencies [line items]
Estimated effect of contingency	617	617
Local municipal authorities demand for property tax [member]
Commitments and contingencies [line items]
Estimated effect of contingency	644	568
Local authorities demand for Sales tax / VAT in respect of spare parts used for carrying out warranty repairs [member]
Commitments and contingencies [line items]
Estimated effect of contingency	341	305
Excise Authorities Denied CENVAT Credit Claimed by the Company From Fiscal 2006 to Fiscal 2017 [member]
Commitments and contingencies [line items]
Estimated effect of contingency	875
Sales tax contingent liability [Member]
Commitments and contingencies [line items]
Estimated effect of contingency	12,841	10,962
Sales tax contingent liability [Member] | Investments accounted for using equity method [member]
Commitments and contingencies [line items]
Estimated effect of contingency	125	109
Sales tax demands for more [Member]
Commitments and contingencies [line items]
Threshold amount of major contingency cases	200
Sales Tax Authorities raised demand towards rejection of certain statutory forms for concessional lower/nil tax rate [Member]
Commitments and contingencies [line items]
Estimated effect of contingency	2,618	2,694
Sales Tax Authorities denied input tax credit and levied interest and penalty thereon due to varied reasons [Member]
Commitments and contingencies [line items]
Estimated effect of contingency	4,652	4,360
Sales tax demand aggregating raised sales tax authorities for non submission of Maharashtra trial balance [member]
Commitments and contingencies [line items]
Estimated effect of contingency	467	958
Sales tax authorities have raised demand for entry tax liability at various states [member]
Commitments and contingencies [line items]
Estimated effect of contingency	₨ 840	₨ 239

Capital Management - Summary of

Capital Management - Summary of Capital (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Total equity as reported in balance sheet	₨ 558,067.4	$ 8,069.9	₨ 913,521	₨ 538,842.2
Currency translation reserve	28,388.6	410.5	49,388.8	(50,933.2)
Hedging reserve	60,668.2	877.2	39,224
Cost of hedge reserve	2,873.9	41.6	4,473.1
Equity as reported above	593,022.3	8,575.3	907,631.5
Short-term borrowings and current portion of long-term debt	351,843.7	5,087.8	277,287.4
Long-term debt	708,067	10,238.8	611,419.4
Total debt	1,059,910.7	15,326.6	888,706.8
Total capital (Debt + Equity)	1,652,933	23,901.9	1,796,338.3
Equity attributable to shareholders of Tata Motors Limited [Member]
Total equity as reported in balance sheet	552,738.7	7,992.8	908,163.5	534,197
Currency translation reserve	(28,388.6)	(410.5)	(49,388.8)
Non-controlling interests [Member]
Total equity as reported in balance sheet	5,328.7	77.1	5,357.5	₨ 4,645.2
Currency translation reserve	₨ (198.6)	$ (2.9)	₨ (197.8)

Disclosures on Financial Inst_3

Disclosures on Financial Instruments - Summary of Carrying Amounts and Fair Value of Each Category of Financial Assets and Liabilities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2018USD ($)	Mar. 31, 2017INR (₨)	Mar. 31, 2016INR (₨)
Financial assets
Cash and cash equivalents	₨ 215,598	$ 3,117.6	₨ 147,167.5	$ 2,128.1	₨ 139,867.6	₨ 171,536.1
Short-term deposits	105,742.1	1,529.1	193,615.7
Finance receivables	336,246.9	4,862.2	238,989.7
Trade receivables	189,961.7	2,746.9	198,933
Other investments - non-current	14,975.1	216.8
Other investments - current	89,383.3	1,292.5
Other financial assets:
- current	49,970.7	722.6	58,443.6
- non-current	32,166	465.1	50,592.8
Financial assets not measured at fair value	1,034,043.8	14,952.8	1,041,956.3
Financial liabilities
Accounts payable	759,681.7	10,985.2	804,601.6
Acceptances	31,771.2	459.5	49,013.4
Short-term debt (excluding current portion of long-term debt)	201,502.6	2,913.8	167,948.5
Long-term debt (including current portion of long-term debt) (refer note below)	858,408.1	12,412.7	720,758.3
Other financial liabilities:
- current	103,669.2	1,499.1	119,118.6
- non-current	29,488.8	426.4	27,887.4
Financial liabilities not measured at fair value	1,984,521.6	28,696.7	1,889,327.8
Unquoted equity investments			2,036.9
Unquoted equity investments at fair value			4,076.1
Other investments			148,101
Measured at fair value [Member]
Financial assets
Cash and cash equivalents	215,598	3,117.6	147,167.5
Short-term deposits	105,742.1	1,529.1	193,615.7
Finance receivables	334,290.5	4,833.9	238,235.9
Trade receivables	189,961.7	2,746.9	198,933
Other investments - non-current	14,975.1	216.8
Other investments - current	89,383.3	1,292.5
Other financial assets:
- current	49,970.7	722.6	58,443.6
- non-current	32,166	465.1	50,592.8
Financial assets not measured at fair value	1,032,087.4	14,924.5	1,039,165.6
Financial liabilities
Accounts payable	759,681.7	10,985.2	804,601.6
Acceptances	31,771.2	459.5	49,013.4
Short-term debt (excluding current portion of long-term debt)	201,502.6	2,913.8	167,948.5
Long-term debt (including current portion of long-term debt) (refer note below)	827,757.5	11,969.6	727,920.3
Other financial liabilities:
- current	103,669.2	1,499.1	119,118.6
- non-current	29,488.8	426.4	27,887.4
Financial liabilities not measured at fair value	1,953,871	$ 28,253.6	1,896,489.8
Unquoted equity investments at fair value			4,076.1
Other investments			148,101
Cash and other financial assets at amortized cost [member]
Financial assets
Cash and cash equivalents	215,598
Short-term deposits	105,742.1
Finance receivables	336,246.9
Trade receivables	189,961.7
Other financial assets:
- current	37,615.3
- non-current	23,054.6
Financial assets not measured at fair value	908,218.6
Investments - FVTOCI [Member]
Financial assets
Other investments - non-current	7,412.9
Other investments - current	9.2
Other financial assets:
Financial assets not measured at fair value	7,422.1
Investments - FVTPL [Member]
Financial assets
Other investments - non-current	7,523.4
Other investments - current	11,919
Other financial assets:
Financial assets not measured at fair value	19,442.4
Investments - amortized cost [member]
Financial assets
Other investments - non-current	38.8
Other investments - current	77,455.1
Other financial assets:
Financial assets not measured at fair value	77,493.9
Derivatives other than in hedging relationship [Member]
Other financial assets:
- current	2,840.2		13,931.8
- non-current	5,219.4		11,880.7
Financial assets not measured at fair value	8,059.6		25,812.5
Other financial liabilities:
- current	8,853.9		8,090.1
- non-current	1,959		1,395.1
Financial liabilities not measured at fair value	10,812.9		9,485.2
Derivatives in hedging relationship [Member]
Other financial assets:
- current	9,515.2		10,829.5
- non-current	3,892		16,588.3
Financial assets not measured at fair value	13,407.2		27,417.8
Other financial liabilities:
- current	38,571.4		53,986.5
- non-current	24,665.4		23,106.9
Financial liabilities not measured at fair value	63,236.8		77,093.4
Financial liabilities other [Member]
Financial liabilities
Accounts payable	759,681.7		804,601.6
Acceptances	31,771.2		49,013.4
Short-term debt (excluding current portion of long-term debt)	201,502.6		167,948.5
Long-term debt (including current portion of long-term debt) (refer note below)	858,408.1		720,758.3
Other financial liabilities:
- current	56,243.9		57,042
- non-current	2,864.4		3,385.4
Financial liabilities not measured at fair value	₨ 1,910,471.9		1,802,749.2
Cash and loans and receivable [Member]
Financial assets
Cash and cash equivalents			147,167.5
Short-term deposits			193,615.7
Finance receivables			238,989.7
Trade receivables			198,933
Other financial assets:
- current			33,682.3
- non-current			22,123.8
Financial assets not measured at fair value			835,606
Other financial liabilities:
Other investments			1,094
Available-for-sale financial assets [Member]
Other financial assets:
Financial assets not measured at fair value			153,120
Other financial liabilities:
Unquoted equity investments			2,036.9
Unquoted equity investments at fair value			4,076.1
Other investments			₨ 147,007

Disclosures on Financial Inst_4

Disclosures on Financial Instruments - Summary of Carrying Amounts and Fair Value of Each Category of Financial Assets and Liabilities (Parenthetical) (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2018USD ($)
Disclosure of detailed information about financial instruments [line items]
USD denominated bonds designated as cash flow hedges against forecasted USD revenue	₨ 69,148.8	$ 1,000	₨ 111,664.4	$ 1,700
Designated hedges [member] | Interest rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Loss on fair value changes attributable to hedged interest rate risk	445.6
Derivatives in hedging relationship [Member] | Designated hedges [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities designated as hedged in fair value hedge relationship	₨ 34,585.5

Disclosures on Financial Inst_5

Disclosures on Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	₨ 48,331.3	$ 698.9	₨ 204,313.4
Financial liabilities measured at fair value	74,049.7	1,070.7	86,578.6
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	19,481.9	281.7	147,007
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	21,466.8	310.5	53,230.3
Financial liabilities measured at fair value	74,049.7	1,070.7	86,578.6
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	7,382.6	$ 106.8	4,076.1
Available-for-sale financial assets [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value			147,007
Available-for-sale financial assets [Member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value			147,007
Unquoted Equity Investments, at Cost [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value			4,076.1
Unquoted Equity Investments, at Cost [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value			4,076.1
Derivative financial instruments [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	21,466.8		53,230.3
Financial liabilities measured at fair value	74,049.7		86,578.6
Derivative financial instruments [Member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	21,466.8		53,230.3
Financial liabilities measured at fair value	74,049.7		₨ 86,578.6
Investments [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	26,864.5
Investments [Member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	19,481.9
Investments [Member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	₨ 7,382.6

Disclosures on Financial Inst_6

Disclosures on Financial Instruments - Additional Information (Detail) $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Financial assets, transfers from Level 1 into Level 2	₨ 0	₨ 0
Financial assets, transfers from Level 2 into Level 1	0	0
Financial liabilities, transfers from Level 1 into Level 2	0	0
Financial liabilities, transfers from Level 2 into Level 1	₨ 0	0
Description of periods when cash flows expected to occur	March 31, 2020 to 2024
Financial liability	₨ 1,984,521,600,000	1,889,327,800,000		$ 28,696.7
Maximum exposure to credit risk	₨ 1,028,129,900,000	₨ 1,035,065,200,000
Percentage of non-convertible debentures invested in bank deposits	15.00%
Commodity derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of risk sensitivity	10.00%	10.00%	10.00%	10.00%
Gain (loss) on commodity derivative contracts	₨ 847,400,000	₨ 2,146,300,000	₨ 9,184,000,000
Quoted equity shares [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets available-for-sale	3,043,100,000	3,404,800,000	2,602,900,000
Foreign Currency Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on commodity derivative contracts	(2,883,700,000)	2,187,900,000	5,044,800,000
Gain loss on recognized in profit or loss due to ten percent Appreciation of Commodity Prices [member] | Commodity derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on commodity derivative contracts	4,797,900,000	4,614,200,000	4,612,400,000
Gain loss on recognized in profit or loss due to ten percent depreciation of Commodity Prices [member] | Commodity derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on commodity derivative contracts	(4,797,900,000)	₨ (4,614,200,000)	₨ (4,612,400,000)
Foreign currency exchange rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of risk sensitivity		10.00%	10.00%		10.00%
Financial liability	843,614,500,000	₨ 839,569,600,000	₨ 657,263,600,000
Foreign currency exchange rate risk [member] | Profit and loss [member] | Financial liabilities, class [member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	77,446,600,000	72,790,600,000	58,201,000,000
Foreign currency exchange rate risk [member] | Profit and loss [member] | Financial assets, class [member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	42,004,400,000	37,497,700,000	28,922,400,000
Foreign currency exchange rate risk [member] | Other comprehensive income loss before tax [member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	₨ 6,914,900,000	₨ 11,166,400,000	₨ 7,525,400,000
Interest rate risk [member] | Variable interest rate [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of risk sensitivity	1.00%	1.00%	1.00%	1.00%
Financial liability	₨ 302,786,300,000	₨ 210,182,800,000	₨ 189,283,600,000
Interest rate risk [member] | Profit and loss [member] | Variable interest rate [member] | Financial liabilities, class [member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	₨ 3,027,900,000	₨ 2,101,800,000	₨ 1,892,800,000
Equity price risk [Member]
Disclosure of detailed information about financial instruments [line items]
Percentage of risk sensitivity	10.00%	10.00%	10.00%	10.00%
Equity price risk [Member] | Quoted equity shares through other comprehensive and AFS [Member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	₨ 304,300,000	₨ 340,500,000	₨ 260,300,000
Equity price risk [Member] | Quoted equity shares through profit and loss [Member]
Disclosure of detailed information about financial instruments [line items]
Potential risk amount due to change risk	423,100,000	0
Investment fair value through profit and loss	₨ 4,231,400,000	₨ 0

Disclosures on Financial Inst_7

Disclosures on Financial Instruments - Summary of Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about financial instruments [line items]
Financial liabilities not measured at fair value	₨ 1,984,521.6	$ 28,696.7	₨ 1,889,327.8
Financial assets not measured at fair value	1,034,043.8	14,952.8	1,041,956.3
Financial assets not measured at fair value
Finance receivables	336,246.9	4,862.2	238,989.7
Other investments			148,101
Financial assets not measured at fair value	1,034,043.8	14,952.8	1,041,956.3
Financial liabilities not measured at fair value
Short-term debt (excluding current portion of long-term debt)	201,502.6	2,913.8	167,948.5
Long-term debt (including current portion of long-term debt)	858,408.1	12,412.7	720,758.3
Financial liabilities not measured at fair value	1,984,521.6	28,696.7	1,889,327.8
Not measured at fair value on recurring basis [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities not measured at fair value	1,029,260.1	14,883.5	895,868.8
Financial assets not measured at fair value	411,784.4	5,954.5	239,329.9
Financial assets not measured at fair value
Finance receivables	334,290.5		238,235.9
Other investments	77,493.9		1,094
Financial assets not measured at fair value	411,784.4	5,954.5	239,329.9
Financial liabilities not measured at fair value
Short-term debt (excluding current portion of long-term debt)	201,502.6		167,948.5
Long-term debt (including current portion of long-term debt)	827,757.5		727,920.3
Financial liabilities not measured at fair value	1,029,260.1	14,883.5	895,868.8
Not measured at fair value on recurring basis [Member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities not measured at fair value	352,851.5	5,102.3	399,497
Financial assets not measured at fair value	77,455.1	1,120
Financial assets not measured at fair value
Other investments	77,455.1
Financial assets not measured at fair value	77,455.1	1,120
Financial liabilities not measured at fair value
Long-term debt (including current portion of long-term debt)	352,851.5		399,497
Financial liabilities not measured at fair value	352,851.5	5,102.3	399,497
Not measured at fair value on recurring basis [Member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities not measured at fair value	676,408.6	9,781.2	496,371.8
Financial assets not measured at fair value			1,094
Financial assets not measured at fair value
Other investments			1,094
Financial assets not measured at fair value			1,094
Financial liabilities not measured at fair value
Short-term debt (excluding current portion of long-term debt)	201,502.6		167,948.5
Long-term debt (including current portion of long-term debt)	474,906		328,423.3
Financial liabilities not measured at fair value	676,408.6	9,781.2	496,371.8
Not measured at fair value on recurring basis [Member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets not measured at fair value	334,329.3	4,834.5	238,235.9
Financial assets not measured at fair value
Finance receivables	334,290.5		238,235.9
Other investments	38.8
Financial assets not measured at fair value	₨ 334,329.3	$ 4,834.5	₨ 238,235.9

Disclosures on Financial Inst_8

Disclosures on Financial Instruments - Summary of Amounts that have been Offset and Amounts that are Available for Offset (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial assets	₨ 466,853.9	$ 6,750.9	₨ 416,979.3
Gross amount recognized as set off in the balance sheet, Financial assets	(39,827.4)	(575.9)	(17,648.5)
Net amount presented in the balance sheet, Financial assets	427,026.5	6,175	399,330.8
Amounts subject to an enforceable master netting arrangement, Financial instruments, Financial assets	(17,173.7)	(248.3)	(49,058.2)
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial assets	0	0	0
Net amount after offsetting, Financial assets	409,852.8	5,926.7	350,272.6
Gross amount recognized, Financial liabilities	964,805.8	13,951.3	970,101.7
Gross amount recognized as set off in the balance sheet, Financial liabilities	(39,827.4)	(575.9)	(17,648.5)
Gross amount recognized as set off in the balance sheet, Financial liabilities	924,978.4	13,375.4	952,453.2
Amounts subject to an enforceable master netting arrangement, Financial instruments, Financial liabilities	(17,173.7)	(248.3)	(49,058.2)
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial liabilities	0	0	0
Net amount after offsetting, Financial liabilities	907,804.7	$ 13,127.1	903,395
Derivative financial instruments [Member]
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial assets	21,466.8		53,230.3
Net amount presented in the balance sheet, Financial assets	21,466.8		53,230.3
Amounts subject to an enforceable master netting arrangement, Financial instruments, Financial assets	(17,173.7)		(49,058.2)
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial assets	0		0
Net amount after offsetting, Financial assets	4,293.1		4,172.1
Gross amount recognized, Financial liabilities	74,049.7		86,578.6
Gross amount recognized as set off in the balance sheet, Financial liabilities	74,049.7		86,578.6
Amounts subject to an enforceable master netting arrangement, Financial instruments, Financial liabilities	(17,173.7)		(49,058.2)
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial liabilities	0		0
Net amount after offsetting, Financial liabilities	56,876		37,520.4
Trade receivables [Member]
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial assets	191,052.4		199,905.7
Gross amount recognized as set off in the balance sheet, Financial assets	(1,090.7)		(972.7)
Net amount presented in the balance sheet, Financial assets	189,961.7		198,933
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial assets	0		0
Net amount after offsetting, Financial assets	189,961.7		198,933
Cash and cash equivalent [Member]
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial assets	254,334.7		163,843.3
Gross amount recognized as set off in the balance sheet, Financial assets	(38,736.7)		(16,675.8)
Net amount presented in the balance sheet, Financial assets	215,598		147,167.5
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial assets	0		0
Net amount after offsetting, Financial assets	215,598		147,167.5
Accounts payable [Member]
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial liabilities	760,772.4		805,574.3
Gross amount recognized as set off in the balance sheet, Financial liabilities	(1,090.7)		(972.7)
Gross amount recognized as set off in the balance sheet, Financial liabilities	759,681.7		804,601.6
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial liabilities	0		0
Net amount after offsetting, Financial liabilities	759,681.7		804,601.6
Loans from banks/financial institutions (short-term) [member]
Disclosure of detailed information about financial instruments [line items]
Gross amount recognized, Financial liabilities	129,983.7		77,948.8
Gross amount recognized as set off in the balance sheet, Financial liabilities	(38,736.7)		(16,675.8)
Gross amount recognized as set off in the balance sheet, Financial liabilities	91,247		61,273
Amounts subject to an enforceable master netting arrangement, Cash collateral, Financial liabilities	0		0
Net amount after offsetting, Financial liabilities	₨ 91,247		₨ 61,273

Disclosures on Financial Inst_9

Disclosures on Financial Instruments - Summary of Carrying Amount of Trade Receivables and Finance Receivables Sold Along with Associated Liabilities (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2019USD ($)
Disclosure of detailed information about financial instruments [line items]
Provision	₨ 380.3	₨ 226.2
Trade receivables [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying amount of asset sold	10,314.6	15,074.4	$ 149.2
Carrying amount of associated liabilities	10,314.6	15,074.4	149.2
Finance receivables [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying amount of asset sold	30,338.3	13,069.1	438.7
Carrying amount of associated liabilities	₨ 30,473.3	₨ 13,205.8	$ 440.7

Disclosures on Financial Ins_10

Disclosures on Financial Instruments - Summary of Gain (Loss) from Cash Flow Hedges Recognized in Other Comprehensive Income and Income Statement (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) recognized in Hedging reserve and cost of hedge reserve	₨ (90,571.2)	$ (1,309.7)	₨ 106,093.1	₨ (262,959.2)
Gain/(loss) reclassified from equity to hedging reserve	(80,562.9)	(1,164.9)	(102,536.7)	(108,817.5)
Revenue [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) reclassified from Hedging reserve to the income statement	(79,529.5)	(1,150)	(118,767)	(112,697.8)
Raw materials, components and consumables [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) reclassified from Hedging reserve to the income statement			15,674.8	7,553.4
Foreign exchange (gain)/loss (net) [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) reclassified from Hedging reserve to the income statement	(1,033.4)	(14.9)	555.5	(3,673.1)
Foreign currency derivative contracts [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) recognized in Hedging reserve and cost of hedge reserve	(80,992.4)	(1,171.2)	94,016.9	(249,818.5)
Foreign currency bonds [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) recognized in Hedging reserve and cost of hedge reserve	(9,429.1)	(136.3)	12,435.2	₨ (13,140.7)
Cross-Currency Interest Rate Swaps [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) recognized in Hedging reserve and cost of hedge reserve	446	6.4	₨ (359)
Interest rate swaps [Member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Gain/(loss) recognized in Hedging reserve and cost of hedge reserve	₨ (595.7)	$ (8.6)

Disclosures on Financial Ins_11

Disclosures on Financial Instruments - Summary of Foreign Currency Exposure (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of detailed information about financial instruments [line items]
Financial assets	₨ 1,034,043.8	$ 14,952.8	₨ 1,041,956.3
Financial liabilities	1,984,521.6	$ 28,696.7	1,889,327.8
Foreign currency exchange rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	420,043.6		374,977.2	₨ 289,224.2
Financial liabilities	843,614.5		839,569.6	657,263.6
Foreign currency exchange rate risk [member] | U.S. dollar [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	227,659.7		135,310.7	104,987.4
Financial liabilities	390,892		369,091	375,478.7
Foreign currency exchange rate risk [member] | Euro [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	125,940.9		128,171.7	98,624.2
Financial liabilities	322,260.4		311,926.9	213,018.3
Foreign currency exchange rate risk [member] | Chinese Renminbi [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	19,853.1		49,977.2	40,009.6
Financial liabilities	38,501.1		53,989.1	33,991.9
Foreign currency exchange rate risk [member] | United Kingdom, Pounds
Disclosure of detailed information about financial instruments [line items]
Financial assets	16,006.7		15,115
Financial liabilities	59,269.8		63,716.6
Foreign currency exchange rate risk [member] | Japanese Yen [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,398.6		4,750.2	1,279.8
Financial liabilities	4,405.9		5,456.5	5,382.2
Foreign currency exchange rate risk [member] | Other currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	27,184.6		41,652.4	44,323.2
Financial liabilities	₨ 28,285.3		₨ 35,389.5	₨ 29,392.5

Disclosures on Financial Ins_12

Disclosures on Financial Instruments - Summary of aging of Trade and Finance Receivables (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about financial instruments [line items]
Trade receivables	₨ 189,961.7	$ 2,746.9	₨ 198,933
Finance receivables	336,246.9	4,862.2	238,989.7
Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	9,701	140.3	12,616.8
Finance receivables	8,330.5	120.4	11,717.9
Not due [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	150,574.7	2,177.4	159,303.3
Finance receivables	330,267.5	4,775.8	231,698.8
Not due [Member] | Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	324.1	4.7	215.7
Finance receivables	6,082	87.9	7,443.7
Overdue up to 3 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	30,955.5	447.6	32,447.9
Finance receivables	4,100.3	59.3	4,371.8
Overdue up to 3 months [Member] | Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	131	1.9	371.5
Finance receivables	194.4	2.8	154.5
Overdue 3-6 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	2,333.2	33.8	1,888.8
Overdue 3-6 months [Member] | Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	183.7	2.7	354.8
Overdue more than 6 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	6,098.3	88.1	5,293
Overdue more than 6 months [Member] | Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	9,062.2	131	11,674.8
Overdue more than 6 months [Member] | Trade receivables [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables overdue more than six months, considered recoverable	5,130.8		4,622.2
Later than three months [member]
Disclosure of detailed information about financial instruments [line items]
Finance receivables	1,879.1	27.2	2,919.1
Later than three months [member] | Allowance for credit losses [Member]
Disclosure of detailed information about financial instruments [line items]
Finance receivables	2,054.1	29.7	4,119.7
Cost [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	199,662.7	2,887	211,549.8
Finance receivables	344,577.4	4,982.7	250,707.6
Cost [Member] | Not due [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	150,898.8	2,182	159,519
Finance receivables	336,349.5	4,863.7	239,142.5
Cost [Member] | Overdue up to 3 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	31,086.5	449.5	32,819.4
Finance receivables	4,294.7	62.1	4,526.3
Cost [Member] | Overdue 3-6 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	2,516.9	36.4	2,243.6
Cost [Member] | Overdue more than 6 months [Member]
Disclosure of detailed information about financial instruments [line items]
Trade receivables	15,160.5	219.1	16,967.8
Cost [Member] | Later than three months [member]
Disclosure of detailed information about financial instruments [line items]
Finance receivables	₨ 3,933.2	$ 56.9	₨ 7,038.8

Disclosures on Financial Ins_13

Disclosures on Financial Instruments - Summary of Contractual Maturities of Financial Liabilities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of maturity analysis for financial liabilities [line items]
Accounts payable and acceptances, carrying amount	₨ 791,452.9		₨ 853,615
Borrowings and interest thereon, carrying amount	1,070,506.5		899,664
Other financial liabilities, carrying amount	48,512.5		49,470.2
Derivative liabilities, carrying amount	74,049.7		86,578.6
Financial liabilities not measured at fair value	1,984,521.6	$ 28,696.7	1,889,327.8
Accounts payable and acceptances, contractual cash flows	791,452.9	11,444.6	853,615
Borrowings and interest thereon, contractual cash flows	1,216,339.3	17,588.6	1,020,717.6
Other financial liabilities, contractual cash flows	52,167.2	754.4	50,237.1
Derivative liabilities, contractual cash flows	92,410.8	1,336.3	105,160.4
Total, contractual cash flows	2,152,370.2	31,123.9	2,029,730.1
Collateralized debt obligations, carrying amount	30,473.3	440.7	13,205.8
Collateralized debt obligations, contractual cash flows	30,473.3	$ 440.7	13,205.8
Later than one year and not later than two years [Member]
Disclosure of maturity analysis for financial liabilities [line items]
Accounts payable and acceptances, contractual cash flows	791,452.9		853,615
Borrowings and interest thereon, contractual cash flows	398,168.8		311,803.8
Other financial liabilities, contractual cash flows	45,648.1		46,273.1
Derivative liabilities, contractual cash flows	47,425.3		62,076.6
Total, contractual cash flows	1,282,695.1		1,273,768.5
Collateralized debt obligations, contractual cash flows	14,824.2		7,280.9
Later than two years and not later than three years [Member]
Disclosure of maturity analysis for financial liabilities [line items]
Borrowings and interest thereon, contractual cash flows	184,162.3		149,973.7
Other financial liabilities, contractual cash flows	1,068.5		1,717.9
Derivative liabilities, contractual cash flows	28,341		29,688
Total, contractual cash flows	213,571.8		181,379.6
Collateralized debt obligations, contractual cash flows	10,134		5,924.9
Later than three years and not later than five years [Member]
Disclosure of maturity analysis for financial liabilities [line items]
Borrowings and interest thereon, contractual cash flows	438,942.3		398,648.1
Other financial liabilities, contractual cash flows	1,887.4		1,176.9
Derivative liabilities, contractual cash flows	13,643.1		12,188.2
Total, contractual cash flows	454,472.8		412,013.2
Collateralized debt obligations, contractual cash flows	5,515.1
Later than five years [Member]
Disclosure of maturity analysis for financial liabilities [line items]
Borrowings and interest thereon, contractual cash flows	195,065.9		160,292
Other financial liabilities, contractual cash flows	3,563.2		1,069.2
Derivative liabilities, contractual cash flows	3,001.4		1,207.6
Total, contractual cash flows	₨ 201,630.5		₨ 162,568.8

Disclosures on Financial Ins_14

Disclosures on Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)
Disclosure of detailed information about financial instruments [line items]
Fair value of derivative financial instruments	₨ (52,582.9)	$ (760.4)	₨ (33,348.3)
Foreign currency forward exchange contracts and options [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value of derivative financial instruments	(52,426.5)	(758.1)	(37,089.3)
Commodity derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Fair value of derivative financial instruments	1,019.5	14.7	(2.4)
Others including interest rate and currency swaps [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value of derivative financial instruments	₨ (1,175.9)	$ (17)	₨ 3,743.4

Disclosures on Financial Ins_15

Disclosures on Financial Instruments - Summary of Changes in Foreign Currency Forward Exchange Contracts and Options Due to 10% Appreciation/Depreciation of Foreign Currency (Detail) - Derivative financial instruments risk management [Member] - Foreign currency forward exchange contracts and options [Member] ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Gain loss on hedging reserve due to ten percent depreciation of foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
10% appreciation of foreign currency	₨ 2,136	$ 30.9	₨ 71,814.7	₨ 130,521.6
Gain loss on recognised in profit or loss due to ten percent depreciation of foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
10% appreciation of foreign currency	925	13.4	(7,371.1)	(9,481.3)
Gain loss on hedging reserve due to ten percent appreciation of foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
10% appreciation of foreign currency	(2,335.1)	(33.8)	(83,992.3)	(129,631.5)
Gain loss recognised in profit or loss due to ten percent appreciation of foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
10% appreciation of foreign currency	₨ 6.7	$ 0.1	₨ 10,373.6	₨ 7,679.5

Disclosures on Financial Ins_16

Disclosures on Financial Instruments - Summary of Changes in Foreign Currency Forward Exchange Contracts and Options Due to 10% Appreciation/Depreciation of Foreign Currency (Parenthetical) (Detail)	12 Months Ended
	Mar. 31, 2019
Foreign currency forward exchange contracts and options [Member] | Derivative financial instruments risk management [Member]
Disclosure of detailed information about financial instruments [line items]
Percentage of risk sensitivity	10.00%

Disclosures on Financial Ins_17

Disclosures on Financial Instruments - Disclosure on Detailed Financials Instruments Designated as Hedging Instrument in Cashflow Hedge (Detail) ₨ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2018INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2019GBP (£)	Mar. 31, 2018GBP (£)
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (48,928.1)	₨ (32,761)	$ (707.5)
Nominal amounts				£ 17,281	£ 21,177
Carrying value	(69,148.8)	(111,756.7)	(999.9)
Nominal amounts				736	1,207
Derivative financial instruments [Member]
Interest rate swaps linked to LIBOR
Financial instruments designated in hedge relationship	(49,829.6)	(35,437.3)	(720.5)
Debt instrument [Member]
Interest rate swaps linked to LIBOR
Financial instruments designated in hedge relationship	(69,148.8)	(111,756.7)	(999.9)
Foreign exchange risk [member]
Disclosure of detailed information about financial instruments [line items]
Carrying value			(4.7)	(325.8)	(2,676.3)
Nominal amounts				825.6	379.6
Carrying value	(118,076.9)	(144,517.7)	(1,707.4)
Nominal amounts				18,017	22,384
Cross-Currency Interest Rate Swaps [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value			(4.7)	(325.8)	(2,676.3)
Nominal amounts				825.6	379.6
Later than five years [Member] | Interest Rate Swap Linked To LIBOR [member]
Interest rate swaps linked to LIBOR
>5 years | $			237.5
>5 years	₨ (575.7)		(8.3)
>5 years	2.86%
U.S. dollar [Member] | Less than 1 year [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (16,706.2)	₨ (16,426.7)	(241.6)
Average strike rate	0.6756	0.6483
Nominal amounts				£ 1,584	£ 2,257
Carrying value	₨ (69,148.8)	₨ (46,142.3)	$ (999.9)
Average strike rate	0.7358	0.6727	0.7358	0.7358	0.6727
Nominal amounts				£ 736	£ 471
U.S. dollar [Member] | Between 1-5 years [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (10,318.2)	₨ (5,075.7)	$ (149.2)
Average strike rate	0.6989	0.6771
Nominal amounts				1,945	£ 2,988
Carrying value | ₨		₨ (65,614.4)
Average strike rate		0.7358			0.7358
Nominal amounts					£ 736
U.S. dollar [Member] | Later than five years [Member] | Cross-Currency Interest Rate Swaps [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value			14.5	1,004.7	(2,676.3)
Average strike rate	759,200	759,200
Nominal amounts				379.6	379.6
Chinese Renminbi [Member] | Less than 1 year [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (13,848.1)	₨ (27,685.4)	(200.2)
Average strike rate	0.1054	0.1018
Nominal amounts				2,132	2,984
Chinese Renminbi [Member] | Between 1-5 years [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (3,892)	₨ (7,659.6)	(56.3)
Average strike rate	0.1075	0.1051
Nominal amounts				1,299	2,582
Euro [Member] | Less than 1 year [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ 1,267.1	₨ 12,919.8	18.3
Average strike rate	0.8823	0.8521
Nominal amounts				3,609	2,568
Euro [Member] | Between 1-5 years [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ (6,607.3)	₨ 13,196.7	(95.5)
Average strike rate	0.9192	0.8994
Nominal amounts				4,030	4,490
Euro [Member] | Later than five years [Member] | Cross-Currency Interest Rate Swaps [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value			(19.2)	(1,330.5)
Average strike rate	891,200
Nominal amounts				446
Other currencies [Member] | Less than 1 year [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ 181	₨ (5,721.6)	2.6
Average strike rate	0.0024	0.0020
Nominal amounts				1,800	1,748
Other currencies [Member] | Between 1-5 years [Member]
Disclosure of detailed information about financial instruments [line items]
Carrying value	₨ 995.6	₨ 3,691.4	$ 14.4
Average strike rate	0.0044	0.0033
Nominal amounts				£ 882	£ 1,560

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019Segments
Disclosure of operating segments [abstract]
Number of reportable segments	4

Segment Reporting - Summary of

Segment Reporting - Summary of Segment Reporting (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Revenues:
Revenues	₨ 2,993,662.4	$ 43,289.2	₨ 2,882,951.1	₨ 2,656,495.1
Earnings Before Other Income, Interest and Tax	(286,354.5)	(4,140.8)	106,234.6	104,812.7
Finance costs pertaining to borrowings sourced by vehicle financing segment	(26,156.5)	(378.2)	(19,053)	(18,465)
Segment results	(312,511)	(4,519)	87,181.6	86,347.7
Share of profit/(loss) of equity accounted investees	2,095	30.3	22,782.6	14,930
Reconciliation to net income/(loss):
Assets written off/loss on sale of assets and others (net)	(13,186.7)	(190.7)	(29,148.6)	(11,418.6)
Other income /(loss) (net)	35,438.7	512.5	47,873.3	39,590.1
Foreign exchange gain/(loss) (net)	(5,824.2)	(84.2)	(4,332.9)	(16,590.4)
Interest income	7,864.6	113.7	7,122.4	5,640.7
Interest expense (net) (excluding pertaining to borrowings sourced by vehicle financing segment)	(31,429.5)	(454.4)	(27,738.3)	(23,900.7)
Income tax expense	25,425	367.7	(37,678.2)	(35,035.6)
Net income/(loss)	(292,128.1)	(4,224.1)	66,061.9	59,563.2
Depreciation and amortization	230,197.8	3,328.7	209,818.2	182,405.4
Capital expenditure	342,236.4	4,948.8	415,102.6	311,627.3
Segment assets	2,490,134.4		2,642,734.9		$ 36,008
Assets classified as held for sale	1,622.4		25,851.9		23.5
Investment in equity accounted investees	53,348.8		48,878.9		771.4
Investment in equity accounted investees (held for sale)			4,973.5
Reconciliation to total assets:
Investments	104,358.4		154,214		1,509.1
Current and non-current income tax assets	12,089.3		11,086.4		174.9
Deferred income taxes	51,511.1		41,064.6	44,221.7	744.9
Other unallocated financial assets	274,055.5		306,706.5		3,963
Total assets	2,987,119.9		3,235,510.9		43,194.8
Segment liabilities	1,257,484.9		1,247,412.8		18,183.6
Reconciliation to total liabilities:
Borrowings	1,059,910.7		888,706.8		15,326.6
Current income tax liabilities	10,176.4		15,590.7		147.2
Deferred income taxes	14,910.4		61,257.8	11,806.4	215.6
Other unallocated financial liabilities	86,570.1		98,320		1,251.9
Total liabilities	2,429,052.5		2,321,989.9		35,124.9
Investments	104,358.4		154,214		1,509.1
Current and non-currentincome tax assets	12,089.3		11,086.4		174.9
Deferred income taxes	51,511.1		41,064.6	44,221.7	744.9
Other unallocated financial assets	274,055.5		306,706.5		3,963
Total assets	2,987,119.9		3,235,510.9		$ 43,194.8
Liabilities classified as held for sale			10,701.8
External [Member]
Revenues:
Revenues	2,993,662.4	$ 43,289.2	2,882,951.1	2,656,495.1
Others [Member]
Revenues:
Revenues	35,323.7		31,334.7	31,154.2
Earnings Before Other Income, Interest and Tax	4,103.6		3,045.8	3,797.7
Segment results	4,103.6		3,045.8	3,797.7
Share of profit/(loss) of equity accounted investees	931.8		1,091.6	834.2
Reconciliation to net income/(loss):
Depreciation and amortization	1,617.1		561.2	1,257.1
Capital expenditure	664.5		841.6	3,652.3
Segment assets	20,037.4		3,303.8
Assets classified as held for sale			27,569.1
Investment in equity accounted investees	5,915
Investment in equity accounted investees (held for sale)			4,973.5
Reconciliation to total assets:
Segment liabilities	5,290.7		840.2
Reconciliation to total liabilities:
Liabilities classified as held for sale			10,701.8
Others [Member] | External [Member]
Revenues:
Revenues	21,890.9		18,564.7	17,420.2
Others [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues	13,432.8		12,770	13,734
Inter-segment Eliminations [Member]
Revenues:
Revenues	(13,432.8)		(12,847.9)	(13,720.4)
Earnings Before Other Income, Interest and Tax	(1,201.8)		(1,456.3)	(1,942.8)
Segment results	(1,201.8)		(1,456.3)	(1,942.8)
Reconciliation to net income/(loss):
Depreciation and amortization	(357.6)
Capital expenditure			(187.8)	(1,740.6)
Segment assets	(12,252.5)		(12,031.4)
Assets classified as held for sale			(3,950.5)
Reconciliation to total assets:
Segment liabilities	(2,520.6)		(3,152.2)
Inter-segment Eliminations [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues	(13,432.8)		(12,847.9)	(13,720.4)
Automotive and related activity [Member]
Revenues:
Revenues	2,971,771.5		2,864,464.3	2,639,061.3
Earnings Before Other Income, Interest and Tax	(289,256.3)		104,645.1	102,957.8
Finance costs pertaining to borrowings sourced by vehicle financing segment	(26,156.5)		(19,053)	(18,465)
Segment results	(315,412.8)		85,592.1	84,492.8
Share of profit/(loss) of equity accounted investees	1,163.2		21,691	14,095.8
Reconciliation to net income/(loss):
Depreciation and amortization	228,938.3		209,257	181,148.3
Capital expenditure	341,571.9		414,448.8	309,715.6
Segment assets	2,482,349.5		2,651,462.5
Assets classified as held for sale	1,622.4		2,233.3
Investment in equity accounted investees	47,433.8		48,878.9
Reconciliation to total assets:
Segment liabilities	1,254,714.8		1,249,724.8
Automotive and related activity [Member] | External [Member]
Revenues:
Revenues	2,971,771.5		2,864,386.4	2,639,074.9
Automotive and related activity [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues			77.9	(13.6)
Automotive and related activity [Member] | Tata and other brand vehicles [Member]
Revenues:
Revenues	721,145.9		623,931.7	494,113.1
Earnings Before Other Income, Interest and Tax	13,403		2,613.5	(34,871.2)
Segment results	13,403		2,613.5	(34,871.2)
Share of profit/(loss) of equity accounted investees	416.7		301.8	252.1
Reconciliation to net income/(loss):
Depreciation and amortization	31,314.4		31,242.8	36,401
Capital expenditure	50,196		33,559.4	39,980.8
Segment assets	428,820.7		406,765.2
Assets classified as held for sale	1,622.4		2,233.3
Investment in equity accounted investees	4,225.5		3,855
Reconciliation to total assets:
Segment liabilities	211,316.5		193,941.8
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | Unallocable [Member]
Revenues:
Revenues			96.3
Earnings Before Other Income, Interest and Tax	(4,761.8)		(4,082.1)	(4,635.8)
Segment results	(4,761.8)		(4,082.1)	(4,635.8)
Share of profit/(loss) of equity accounted investees	416.7		301.8	252.1
Reconciliation to net income/(loss):
Depreciation and amortization	1,524.3		1,457.4	1,400.9
Capital expenditure	763.5		859.8	912.2
Segment assets	15,037		63,355.4
Investment in equity accounted investees	4,225.5		3,855
Reconciliation to total assets:
Segment liabilities	17,521.3		27,198.3
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | Commercial Vehicle [Member]
Revenues:
Revenues	579,496.9		494,917.2	414,891.9
Earnings Before Other Income, Interest and Tax	34,007.1		36,694.4	(1,781.7)
Segment results	34,007.1		36,694.4	(1,781.7)
Reconciliation to net income/(loss):
Depreciation and amortization	16,164.1		15,417.3	19,333.6
Capital expenditure	20,100.8		13,554.5	16,562
Segment assets	237,225.5		206,937.3
Assets classified as held for sale	1,622.4		2,233.3
Reconciliation to total assets:
Segment liabilities	157,447.7		135,371.8
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | Passenger Vehicle [Member]
Revenues:
Revenues	141,649		128,918.2	79,221.2
Earnings Before Other Income, Interest and Tax	(15,842.3)		(29,998.8)	(28,453.7)
Segment results	(15,842.3)		(29,998.8)	(28,453.7)
Reconciliation to net income/(loss):
Depreciation and amortization	13,626		14,368.1	15,666.5
Capital expenditure	29,331.7		19,145.1	22,506.6
Segment assets	176,558.2		136,472.5
Reconciliation to total assets:
Segment liabilities	36,347.5		31,371.7
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | External [Member]
Revenues:
Revenues	721,119.1		623,853.8	494,080
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | External [Member] | Unallocable [Member]
Revenues:
Revenues			96.3
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | External [Member] | Commercial Vehicle [Member]
Revenues:
Revenues	579,496.9		494,917.2	414,891.9
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | External [Member] | Passenger Vehicle [Member]
Revenues:
Revenues	141,622.2		128,840.3	79,188.1
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues	26.8		77.9	33.1
Automotive and related activity [Member] | Tata and other brand vehicles [Member] | Inter-segment/intra-segment [Member] | Passenger Vehicle [Member]
Revenues:
Revenues	26.8		77.9	33.1
Automotive and related activity [Member] | Vehicle Financing [Member]
Revenues:
Revenues	35,125		26,152.2	24,556.3
Earnings Before Other Income, Interest and Tax	21,153.3		17,079.3	16,962.2
Finance costs pertaining to borrowings sourced by vehicle financing segment	(26,156.5)		(19,053)	(18,465)
Segment results	(5,003.2)		(1,973.7)	(1,502.8)
Share of profit/(loss) of equity accounted investees	(7.2)
Reconciliation to net income/(loss):
Depreciation and amortization	186.5		183.4	275.3
Capital expenditure	719.6		471.5	76.1
Segment assets	382,615.8		276,709.4
Investment in equity accounted investees	26.6
Reconciliation to total assets:
Segment liabilities	7,114.3		7,244
Automotive and related activity [Member] | Vehicle Financing [Member] | External [Member]
Revenues:
Revenues	33,995.5		26,040.3	24,318.3
Automotive and related activity [Member] | Vehicle Financing [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues	1,129.5		111.9	238
Automotive and related activity [Member] | Jaguar Land Rover vehicles [Member]
Revenues:
Revenues	2,216,656.9		2,214,492.3	2,120,676.6
Earnings Before Other Income, Interest and Tax	(323,812.6)		84,952.3	120,866.8
Segment results	(323,812.6)		84,952.3	120,866.8
Share of profit/(loss) of equity accounted investees	753.7		21,389.2	13,843.7
Reconciliation to net income/(loss):
Depreciation and amortization	197,437.4		177,830.8	144,472
Capital expenditure	290,656.3		380,417.9	269,658.7
Segment assets	1,670,913		1,967,993.9
Investment in equity accounted investees	43,181.7		45,023.9
Reconciliation to total assets:
Segment liabilities	1,039,660.5		1,048,546.1
Automotive and related activity [Member] | Jaguar Land Rover vehicles [Member] | External [Member]
Revenues:
Revenues	2,216,656.9		2,214,492.3	2,120,676.6
Automotive and related activity [Member] | Intra-segment Eliminations [Member]
Revenues:
Revenues	(1,156.3)		(111.9)	(284.7)
Reconciliation to net income/(loss):
Segment assets			(6)
Reconciliation to total assets:
Segment liabilities	(3,376.5)		(7.1)
Automotive and related activity [Member] | Intra-segment Eliminations [Member] | Inter-segment/intra-segment [Member]
Revenues:
Revenues	₨ (1,156.3)		₨ (111.9)	₨ (284.7)

Segment Reporting - Summary o_2

Segment Reporting - Summary of Segment Reporting (Parenthetical) (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of operating segments [abstract]
Reversal for loss of inventory (net of insurance recoveries)	₨ (111.9)	₨ (13,301)

Segment Reporting - Summary o_3

Segment Reporting - Summary of Information Concerning Principal Geographic Areas (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Disclosure of geographical areas [line items]
Revenues	₨ 2,993,662.4	$ 43,289.2	₨ 2,882,951.1	₨ 2,656,495.1
Non-current assets	1,353,963.6		1,540,593.7		$ 19,578.6
India [Member]
Disclosure of geographical areas [line items]
Revenues	678,148.1	9,806.2	578,403.3	422,499.1
Non-current assets	248,726.3		224,623.2		3,596.6
United States of America [Member]
Disclosure of geographical areas [line items]
Revenues	512,511.1	7,411	448,881.5	413,469.9
Non-current assets	2,919.9		2,990		42.2
United Kingdom [Member]
Disclosure of geographical areas [line items]
Revenues	559,993	8,097.7	418,970.3	486,091.5
Non-current assets	981,062.7		1,211,921.5		14,186.4
Rest of Europe [Member]
Disclosure of geographical areas [line items]
Revenues	452,087.8	6,537.3	470,288	469,926.9
Non-current assets	94,708		72,420.6		1,369.5
China [Member]
Disclosure of geographical areas [line items]
Revenues	303,929.1	4,394.9	481,675	410,721.9
Non-current assets	1,409.2		1,661.1		20.4
Rest of the World [Member]
Disclosure of geographical areas [line items]
Revenues	486,993.3	$ 7,042.1	484,733	₨ 453,785.8
Non-current assets	₨ 25,137.5		₨ 26,977.3		$ 363.5

Segment Reporting - Summary o_4

Segment Reporting - Summary of Information About Product Revenues (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of products and services [line items]
Revenues	₨ 2,959,666.9	$ 42,797.6	₨ 2,856,910.8	₨ 2,632,176.8
Finance revenues	33,995.5	491.6	26,040.3	24,318.3
Total revenues	2,993,662.4	43,289.2	2,882,951.1	2,656,495.1
Tata and Fiat vehicles [Member]
Disclosure of products and services [line items]
Revenues	682,076.2	9,863	575,483.5	436,306.2
Tata Daewoo commercial vehicles [Member]
Disclosure of products and services [line items]
Revenues	39,042.9	564.6	48,370.3	57,773.8
Jaguar Land Rover vehicles [Member]
Disclosure of products and services [line items]
Revenues	2,216,656.9	32,053.5	2,214,492.3	2,120,676.6
Others [Member]
Disclosure of products and services [line items]
Revenues	₨ 21,890.9	$ 316.5	₨ 18,564.7	₨ 17,420.2

Related-party Transactions - Su

Related-party Transactions - Summary of Related-party Transactions and Balances Included in Consolidated Financial Statements (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)	Mar. 31, 2019USD ($)
Disclosure of transactions between related parties [line items]
Purchase of products	₨ 65,151.3	$ 942.1	₨ 59,401	₨ 44,224.1
Sale of products	49,283.7	712.7	74,644	60,192.4
Services received	19,141.3	276.8	22,944.5	30,697.7
Services rendered	9,093.6	131.5	12,551.6	9,347.7
Acceptances	54,937.8		41,350.3	32,027.7	$ 794.4
Purchase of property, plant and equipment	143	2.1	626	139
Purchase of investments	72	1	25
Sale of investments	5,333.5	77.1
Interest (income)/expense, dividend (income)/paid, (net)	(2,146.5)	$ (31)	(17,522.9)	(5,533.2)
Loans given	57.5			303	0.8
Loans taken	1,770		4,890	9,186.3	25.6
Loans repaid by us	2,100		4,890	9,269.5	30.4
Amounts receivable in respect of loans and interest thereon	75.5		40	93.3	1.1
Amounts payable in respect of loans and interest thereon	266		608	1,615.5	3.8
Trade and other receivables	3,865.5		12,514.7	7,753.9	55.9
Accounts payable	9,259.1		6,704.3	6,574.6	133.9
Acceptances	691.3		2,201.6		$ 10
Deposit given as security			30	30
Conversion of Optionally Convertible Preference shares in to equity shares				1,600
Loans given, repaid				1,928
Associates and its subsidiaries [Member]
Disclosure of transactions between related parties [line items]
Purchase of products	23,691		26,057	20,585.2
Sale of products	3,284		2,016	2,504.9
Services received	462		89	109.8
Services rendered	217		190	166.4
Purchase of property, plant and equipment	135		624	137.9
Purchase of investments	72
Interest (income)/expense, dividend (income)/paid, (net)	(124)		(95)	(111)
Loans taken	1,770		4,890	3,290
Loans repaid by us	2,100		4,890	3,000
Amounts payable in respect of loans and interest thereon	230		560	560
Trade and other receivables	556		633	495.2
Accounts payable	3,043		1,496	397.6
Conversion of Optionally Convertible Preference shares in to equity shares				1,600
Joint ventures [Member]
Disclosure of transactions between related parties [line items]
Purchase of products	24.6			213
Sale of products	29,465.5		60,082.1	49,835.3
Services received	11.3		5,500.9	10,885.7
Services rendered	7,653.2		12,077.2	7,718.8
Purchase of investments			25
Interest (income)/expense, dividend (income)/paid, (net)	(1,991.3)		(17,644.9)	(5,943.6)
Loans given	57.5
Amounts receivable in respect of loans and interest thereon	37.5
Trade and other receivables	1,321.5		10,371.4	5,658.6
Accounts payable	25.9		2.5	226.3
Joint operations [Member]
Disclosure of transactions between related parties [line items]
Purchase of products	39,407.7		31,631	22,757.5
Sale of products	8,253.2		5,454.9	3,237.2
Services received			1.6	0.7
Services rendered	60.4		43.4	161.2
Interest (income)/expense, dividend (income)/paid, (net)	(262.2)		(46)	(121.2)
Trade and other receivables			(0.7)
Accounts payable	2,461.2		1,848.8	1,239.6
Loans given, repaid				1,325
Tata Sons Private Limited [Member]
Disclosure of transactions between related parties [line items]
Purchase of products	2,028		1,713	668.4
Sale of products	8,281		7,091	4,615
Services received	18,668		17,353	19,701.5
Services rendered	1,163		241	1,301.3
Acceptances	54,937.8		41,350.3	32,027.7
Purchase of property, plant and equipment	8		2	1.1
Sale of investments	5,333.5
Interest (income)/expense, dividend (income)/paid, (net)	231		263	642.6
Loans given				303
Loans taken				5,896.3
Loans repaid by us				6,269.5
Amounts receivable in respect of loans and interest thereon	38		40	93.3
Amounts payable in respect of loans and interest thereon	36		48	1,055.5
Trade and other receivables	1,988		1,511	1,600.1
Accounts payable	3,729		3,357	4,711.1
Acceptances	₨ 691.3		2,201.6
Deposit given as security			₨ 30	30
Loans given, repaid				₨ 603

Related-party Transactions - _2

Related-party Transactions - Summary of Compensation and Other Transactions with Key Management Personnel (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2017INR (₨)
Disclosure of transactions between related parties [line items]
Short-term benefits	₨ 633.9	$ 9.2	₨ 798.4	₨ 693.1
Post-employment benefits	54.6	0.8	17.6	184.7
Share based payment	4.4	0.1
Sale of products	₨ 49,283.7	$ 712.7	₨ 74,644	60,192.4
Dividend paid				730
Key management personnel [Member]
Disclosure of transactions between related parties [line items]
Sale of products				8.1
Dividend paid				₨ 0

Related-party Transactions - _3

Related-party Transactions - Summary of Compensation and Other Transactions with Key Management Personnel (Parenthetical) (Detail)	12 Months Ended
	Mar. 31, 2017INR (₨)
Disclosure of transactions between related parties [abstract]
Dividend paid	₨ 50,000

Earnings Per Share ("EPS") - Su

Earnings Per Share ("EPS") - Summary of Earnings Per Share (Detail) ₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019INR (₨)₨ / sharesshares	Mar. 31, 2019USD ($)$ / sharesshares	Mar. 31, 2018INR (₨)₨ / sharesshares	Mar. 31, 2017INR (₨)₨ / sharesshares
Ordinary shares [Member]
Earnings per share [line items]
Net income attributable to shareholders, Basic net earnings per share	₨ (249,246.9)	$ (3,604.2)	₨ 55,258.1	₨ 49,730.2
Net income attributable to shareholders, Effect of shares kept in abeyance | ₨			(2.4)	(2.2)
Net income attributable to shareholders, Diluted earnings per share	₨ (249,246.9)	$ (3,604.2)	₨ 55,255.7	₨ 49,728
Weighted average shares, Basic net earnings per share	2,887,348,474	2,887,348,474	2,887,348,357	2,887,218,310
Weighted average shares, Effect of shares kept in abeyance			494,469	599,766
Weighted average shares, Diluted earnings per share	2,887,348,474	2,887,348,474	2,887,842,826	2,887,818,076
Basic net earnings per share | (per share)	₨ (86.3)	$ (1.2)	₨ 19.1	₨ 17.2
Earnings per share, Effect of shares kept in abeyance | ₨ / shares			(4.9)	(3.7)
Diluted earnings per share | (per share)	₨ (86.3)	$ (1.2)	₨ 19.1	₨ 17.2
'A' Ordinary shares [Member]
Earnings per share [line items]
Net income attributable to shareholders, Basic net earnings per share	₨ (43,895.8)	$ (634.7)	₨ 9,782.6	₨ 8,809.1
Net income attributable to shareholders, Effect of shares kept in abeyance | ₨			2.4	2.2
Net income attributable to shareholders, Diluted earnings per share	₨ (43,895.8)	$ (634.7)	₨ 9,785	₨ 8,811.3
Weighted average shares, Basic net earnings per share	508,502,371	508,502,371	508,502,336	508,483,714
Weighted average shares, Effect of shares kept in abeyance			233,774	252,396
Weighted average shares, Diluted earnings per share	508,502,371	508,502,371	508,736,110	508,736,110
Basic net earnings per share | (per share)	₨ (86.3)	$ (1.2)	₨ 19.2	₨ 17.3
Earnings per share, Effect of shares kept in abeyance | ₨ / shares			10.3	8.7
Diluted earnings per share | (per share)	₨ (86.3)	$ (1.2)	₨ 19.2	₨ 17.3

Earnings Per Share ("EPS") - Ad

Earnings Per Share ("EPS") - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019
'A' Ordinary shares [Member]
Earnings per share [line items]
Percentage points more than the aggregate rate of dividend declared on Ordinary shares that 'A' Ordinary shareholders are entitled to	5.00%

The Assets and Liabilities of T

The Assets and Liabilities of Tata Technologies Limited, Tal Manufacturing Solutions Limited, Company's Certain Assets Related to Defence Business are Classified as "Held for Sale" as They Meet Criteria Laid Out Under IFRS 5 - Summary of Assets and Liabilities Classifed as Held for Sale (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019INR (₨)	Mar. 31, 2019USD ($)	Mar. 31, 2018INR (₨)	Mar. 31, 2018USD ($)	Mar. 31, 2017INR (₨)	Mar. 31, 2016INR (₨)
Current assets:
Cash and cash equivalents	₨ 215,598	$ 3,117.6	₨ 147,167.5	$ 2,128.1	₨ 139,867.6	₨ 171,536.1
Short-term deposits	105,742.1	1,529.1	193,615.7
Trade receivables	189,961.7	2,746.9	198,933
Other financial assets	49,970.7	722.6	58,443.6
Inventories	390,015.9	5,639.7	424,296.2
Other current assets	68,622.2	992.3	76,625.5
Current income tax assets	1,843.7	26.7	2,087.4
Total current assets	1,228,275.2	17,761.3	1,362,648.3
Non-currentassets:
Investments	14,975.1	216.8	7,576.5
Other financial assets	32,166	465.1	50,592.8
Property, plant and equipment	762,303.3	11,023.1	850,444.1
Goodwill	7,478.7	108.1	1,164.5	$ 16.8	6,733.2
Intangible assets	580,555.9	8,395	685,167.9
Non-current income tax assets	10,245.6	148.2	8,999
Deferred income taxes	51,511.1	744.9	41,064.6		₨ 44,221.7
Other non-currentassets	25,528.5	369.1	24,001.1
Total non-current assets	1,758,844.7	25,433.5	1,872,862.6
Total assets	2,987,119.9	43,194.8	3,235,510.9
Current liabilities:
Accounts payable	759,681.7	10,985.2	804,601.6
Short-term borrowings and current portion of long-term debt	351,843.7	5,087.8	277,287.4
Other financial liabilities	103,669.2	1,499.1	119,118.6
Provisions	101,967.5	1,474.5	79,418.5
Other current liabilities	88,640.9	1,281.8	72,050.7
Current income tax liabilities	10,176.4	147.2	15,590.7
Total current liabilities	1,447,750.6	20,935.1	1,427,782.7
Non-currentliabilities:
Long-term debt	708,067	10,238.8	611,419.4
Other financial liabilities	29,488.8	426.4	27,887.4
Provisions	118,548.5	1,714.2	109,493.3
Other liabilities	110,287.2	1,594.8	84,149.3
Total non-current liabilities	981,301.9	14,189.8	894,207.2
Total liabilities	2,429,052.5	35,124.9	2,321,989.9
Assets and liabilities classified as held for sale [member]
Current assets:
Cash and cash equivalents			2,439.4
Short-term deposits			201.2
Trade receivables			5,245.8
Other financial assets			319
Inventories			958
Other current assets			584.6
Current income tax assets			726.4
Total current assets			10,474.5
Non-currentassets:
Investments			317.9
Other financial assets			546.9
Property, plant and equipment	11.4	0.2	4,545.3
Goodwill			5,579.1
Intangible assets	1,611	23.3	3,076.1
Non-current income tax assets			318.4
Deferred income taxes			211.6
Other non-currentassets			782.1
Total non-current assets	1,622.4	23.5	15,377.4
Total assets	₨ 1,622.4	$ 23.5	25,851.9
Current liabilities:
Accounts payable			3,926.4
Short-term borrowings and current portion of long-term debt			939
Other financial liabilities			67
Provisions			117.1
Other current liabilities			1,844.1
Current income tax liabilities			714.3
Total current liabilities			7,607.9
Non-currentliabilities:
Long-term debt			486.5
Other financial liabilities			13.4
Provisions			297
Other liabilities			2,296.9
Total non-current liabilities			3,093.9
Total liabilities			₨ 10,701.8

Tata Motors Limited (Parent Com

Tata Motors Limited (Parent Company) - Additional Information (Detail) - Tata Motors Limited [member] - INR (₨) ₨ in Millions	Mar. 31, 2019	Mar. 31, 2018
Statement [line items]
Restricted net assets not available for distribution	₨ 127,705.6	₨ 429,855.1
Bottom of range [member]
Statement [line items]
Threshold percentage of restricted net assets to consolidated net assets	25.00%

Investment to Subsidiaries - Su

Investment to Subsidiaries - Summary of Subsidiaries (Detail)	12 Months Ended
	Mar. 31, 2019
Concorde Motors (India) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Concorde Motors (India) Limited
Country of incorporation	India
% of Equity Shareholding	100.00%
Tata Motors European Technical Centre PLC [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors European Technical Centre PLC
Country of incorporation	UK
% of Equity Shareholding	100.00%
Tata Motors Insurance Broking and Advisory Services Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors Insurance Broking and Advisory Services Limited
Country of incorporation	India
% of Equity Shareholding	100.00%
TMF Holdings Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	TMF Holdings Limited (formerly known as Tata Motors Finance Limited)
Country of incorporation	India
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	TML Holdings Pte. Limited
Country of incorporation	Singapore
% of Equity Shareholding	100.00%
TML Distribution Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	TML Distribution Company Limited
Country of incorporation	India
% of Equity Shareholding	100.00%
Tata Hispano Motors Carrocera S.A. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Hispano Motors Carrocera S.A.
Country of incorporation	Spain
% of Equity Shareholding	100.00%
Tata Hispano Motors Carrocerries Maghreb SA [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Hispano Motors Carrocerries Maghreb SA
Country of incorporation	Morocco
% of Equity Shareholding	100.00%
Trilix S.r.l. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Trilix S.r.l.
Country of incorporation	Italy
% of Equity Shareholding	100.00%
Tata Precision Industries Pte. Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Precision Industries Pte. Limited
Country of incorporation	Singapore
% of Equity Shareholding	78.39%
Tata Technologies Limited [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies Limited
Country of incorporation	India
% of Equity Shareholding	72.28%
Tata Marcopolo Motors Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Marcopolo Motors Limited
Country of incorporation	India
% of Equity Shareholding	51.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | Tata Daewoo Commercial Vehicle Company Limited [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Daewoo Commercial Vehicle Company Limited
Country of incorporation	South Korea
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | Tata Daewoo Commercial Vehicle Sales and Distribution Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Daewoo Commercial Vehicle Sales and Distribution Company Limited
Country of incorporation	South Korea
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | Tata Motors (Thailand) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors (Thailand) Limited
Country of incorporation	Thailand
% of Equity Shareholding	95.87%
Subsidiaries of TML Holdings Pte. Ltd. [member] | Tata Motors (SA) (Proprietary) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors (SA) (Proprietary) Limited
Country of incorporation	South Africa
% of Equity Shareholding	60.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | PT Tata Motors Indonesia [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	PT Tata Motors Indonesia
Country of incorporation	Indonesia
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | PT Tata Motors Distribusi Indonesia [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	PT Tata Motors Distribusi Indonesia
Country of incorporation	Indonesia
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | TMNL Motor Services Nigeria Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	TMNL Motor Services Nigeria Limited
Country of incorporation	Nigeria
% of Equity Shareholding	100.00%
Subsidiaries of TML Holdings Pte. Ltd. [member] | Jaguar Land Rover Automotive Plc [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Automotive Plc
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Automotive Plc [member] | Jaguar Land Rover Limited [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Holdings Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Limited [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Austria GmbH [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Austria GmbH
Country of incorporation	Austria
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Japan Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Japan Limited
Country of incorporation	Japan
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | JLR Nominee Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	JLR Nominee Company Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Deutschland GmbH [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Deutschland GmbH
Country of incorporation	Germany
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover North America LLC [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover North America LLC
Country of incorporation	USA
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Nederland BV [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Nederland BV
Country of incorporation	Netherlands
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Portugal - Veculos e Pecas Lda. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Portugal - Veículos e Peças, Lda.
Country of incorporation	Portugal
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Australia Pty Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Australia Pty Limited
Country of incorporation	Australia
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Italia Spa [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Italia Spa
Country of incorporation	Italy
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Korea Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Korea Company Limited
Country of incorporation	South Korea
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover (China) Investment Co. Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover (China) Investment Co. Limited
Country of incorporation	China
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Canada ULC [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Canada ULC
Country of incorporation	Canada
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover France, SAS [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover France, SAS
Country of incorporation	France
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover (South Africa) (Pty) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover (South Africa) (Pty) Limited
Country of incorporation	South Africa
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar e Land Rover Brasil Indstria e Comrcio de Veculos LTDA [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar e Land Rover Brasil Indústria e Comércio de Veículos LTDA
Country of incorporation	Brazil
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Limited Liability Company "Jaguar Land Rover" (Russia) [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Limited Liability Company "Jaguar Land Rover" (Russia)
Country of incorporation	Russia
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover (South Africa) Holdings Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover (South Africa) Holdings Limited
Country of incorporation	South Africa
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover India Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover India Limited
Country of incorporation	India
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Espana SL [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Espana SL
Country of incorporation	Spain
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Belux NV [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Belux NV
Country of incorporation	Belgium
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Cars South Africa (Pty) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Cars South Africa (Pty) Limited
Country of incorporation	South Africa
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | The Jaguar Collection Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	The Jaguar Collection Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Cars Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Cars Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Land Rover Exports Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Land Rover Exports Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Land Rover Ireland Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Land Rover Ireland Limited
Country of incorporation	Ireland
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | The Daimler Motor Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	The Daimler Motor Company Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Daimler Transport Vehicles Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Daimler Transport Vehicles Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | S.S. Cars Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	S.S. Cars Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | The Lanchester Motor Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	The Lanchester Motor Company Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Shanghai Jaguar Land Rover Automotive Services Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Shanghai Jaguar Land Rover Automotive Services Company Limited
Country of incorporation	China
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Pension Trustees Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Pension Trustees Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Slovakia s.r.o [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Slovakia s.r.o
Country of incorporation	Slovakia
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Singapore Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Singapore Pte. Ltd.
Country of incorporation	Singapore
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Racing Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Racing Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | InMotion Ventures Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	InMotion Ventures Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | InMotion Ventures 1 Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	InMotion Ventures 1 Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | InMotion Ventures 2 Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	InMotion Ventures 2 Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | InMotion Ventures 3 Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	InMotion Ventures 3 Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | InMotion Ventures 4 Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	InMotion Ventures 4 Limited
Country of incorporation	UK
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Colombia S.A.S [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Colombia S.A.S
Country of incorporation	Columbia
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Ireland (Services) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Ireland (Services) Limited
Country of incorporation	Ireland
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Taiwan Company Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Taiwan Company Limited
Country of incorporation	Taiwan
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Servicios Mxico, S.A. de C.V. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Servicios México, S.A. de C.V.
Country of incorporation	Mexico
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Mxico, S.A.P.I. de C.V. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover México, S.A.P.I. de C.V.
Country of incorporation	Mexico
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Hungary KFT [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Hungary KFT
Country of incorporation	Hungary
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Jaguar Land Rover Classic USA LLC [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Jaguar Land Rover Classic USA LLC
Country of incorporation	USA
% of Equity Shareholding	100.00%
Subsidiaries of Jaguar Land Rover Holdings Limited [member] | Spark44 (JV) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 (JV) Limited
Country of incorporation	UK
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Pty. Ltd. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Pty. Ltd.
Country of incorporation	Australia
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 GmbH [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 GmbH
Country of incorporation	Germany
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 LLC [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 LLC
Country of incorporation	USA
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Shanghai Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Shanghai Limited
Country of incorporation	China
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 DMCC [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 DMCC
Country of incorporation	UAE
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Demand Creation Partners Pvt. Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Demand Creation Partners Pvt. Limited
Country of incorporation	India
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Limited
Country of incorporation	UK
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Singapore Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Singapore Pte. Ltd.
Country of incorporation	Singapore
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Communications SL [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Communications SL
Country of incorporation	Spain
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 S.r.l. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 S.r.l.
Country of incorporation	Italy
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Seoul Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Seoul Limited
Country of incorporation	Korea
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Japan K.K. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Japan K.K.
Country of incorporation	Japan
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Canada Inc [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Canada Inc
Country of incorporation	Canada
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark44 Pty. Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Pty. Limited
Country of incorporation	South Africa
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark 44 Colombia SAS [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Colombia S.A.S.
Country of incorporation	Columbia
% of Equity Shareholding	50.50%
Subsidiaries of Spark44 (JV) Limited [member] | Spark 44 Taiwan Limited [Member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Spark44 Taiwan Limited
Country of incorporation	Taiwan
% of Equity Shareholding	50.50%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies Pte Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies Pte Limited
Country of incorporation	Singapore
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies (Thailand) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies (Thailand) Limited
Country of incorporation	Thailand
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | Tata Manufacturing Technologies (Shanghai) Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Manufacturing Technologies (Shanghai) Limited
Country of incorporation	China
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | INCAT International Plc. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	INCAT International Plc.
Country of incorporation	UK
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | INCAT GmbH [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	INCAT GmbH
Country of incorporation	Germany
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies Europe Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies Europe Limited
Country of incorporation	UK
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | Escenda Engineering AB [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Escenda Engineering AB
Country of incorporation	Sweden
% of Equity Shareholding	72.28%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies Inc. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies Inc.
Country of incorporation	USA
% of Equity Shareholding	72.35%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies de Mexico, S.A. de C.V. [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies de Mexico, S.A. de C.V.
Country of incorporation	Mexico
% of Equity Shareholding	72.35%
Subsidiaries of Tata Technologies Limited [member] | Cambric GmbH [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Cambric GmbH
Country of incorporation	Germany
% of Equity Shareholding	72.35%
Subsidiaries of Tata Technologies Limited [member] | Cambric Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Cambric Limited
Country of incorporation	USA
% of Equity Shareholding	72.32%
Subsidiaries of Tata Technologies Limited [member] | Tata Technologies SRL Romania [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Technologies SRL Romania
Country of incorporation	Romania
% of Equity Shareholding	72.32%
Subsidiaries of TMF Holdings Ltd. [member] | Tata Motors Finance Solutions Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors Finance Solutions Limited
Country of incorporation	India
% of Equity Shareholding	100.00%
Subsidiaries of TMF Holdings Ltd. [member] | Tata Motors Finance Limited [member]
Disclosure of subsidiaries [line items]
Name of the Subsidiary Company	Tata Motors Finance Limited
Country of incorporation	India
% of Equity Shareholding	100.00%