The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_ii&doctype=Standard
-URIDate 2021-03-24

+ Details

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Period Type:	duration

- Definition

The increase (decrease) in equity. [Refer: Equity]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2021-03-24

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of employer contributions to retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2021-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_i&doctype=Standard
-URIDate 2021-03-24

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Consolidated statement of comprehensive income (Parenthetical) € in Millions, £ in Millions	1 Months Ended
	Mar. 31, 2021 GBP (£)	Mar. 31, 2021 EUR (€)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 EUR (€)
Main Scheme
Disclosure of transactions between related parties [line items]
Contributions	£ 500
Decrease in equity	365
Ireland Pension Scheme
Disclosure of transactions between related parties [line items]
Net gain (loss) due to significant movements in underlying actuarial assumptions	(192)	€ (224)	£ 72	€ 81
UK Government Investments Ltd (UKGI) \| Main Scheme
Disclosure of transactions between related parties [line items]
Contributions	500
Decrease in equity	£ 365