Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Property Plant And Equipment [Abstract]
Land acquired on lease	$ 98	$ 99
Contractual commitments for capital expenditure	$ 223	$ 177

The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2017-01-01
-Paragraph 74
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_74_c&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_ContractualCommitmentsForAcquisitionOfPropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant