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Accounting information and policies - Going Concern Narrative (Details) - Jun. 30, 2021 € in Millions, £ in Millions, $ in Millions	EUR (€)	GBP (£)	USD ($)
Schedule Of Going Concern [Line Items]
Notional amounts	€ 900		$ 1,000
Euro | European debt issuance programme
Schedule Of Going Concern [Line Items]
Notional amounts | €	€ 700
Sterling | European debt issuance programme
Schedule Of Going Concern [Line Items]
Notional amounts | £		£ 400

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- Definition

Schedule Of Going Concern [Line Items]

+ References

No definition available.

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2020-01-01

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