Commitments - Operating lease commitments and Capital commitments (Details) - EUR (€) € in Millions	Mar. 31, 2021	Mar. 31, 2020
Commitments
Capital commitments from company and subsidiaries	€ 3,993	€ 3,046
Capital commitments from share of joint operations	133	103
Contracts placed for future capital expenditure not provided in the financial statements	€ 4,126	€ 3,149

The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

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