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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details) - £ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share)	£ 0.0001	£ 0.0001
Movement in Number of Shares held by ESOP Trustees [Roll Forward]
Beginning balance	15,977,968,688
Shares utilized during the year	0
Shares sold from the ESOP during the year	0
Ending balance	15,977,968,688	15,977,968,688
Ordinary shares
Class of Stock [Line Items]
Common stock, par value (in GBP per share)	£ 0.50	£ 0.50
Movement in Number of Shares held by ESOP Trustees [Roll Forward]
Beginning balance	1,216,220
Shares utilized during the year	(131,909)
Shares sold from the ESOP during the year	(70,799)
Ending balance	1,013,512	1,216,220

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Employee Stock Ownership Plan (ESOP), Shares Sold From ESOP

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Employee Stock Ownership Plan (ESOP), Shares Utilized During Period

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Movement In Number Of Shares Held By Employee Stock Ownership Plan Trustees [Roll Forward]

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

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Face amount or stated value per share of common stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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