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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details) - £ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
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 | 1,621,301 |
Shares utilized during the year | (253,881) |
Shares sold from the ESOP during the year | (151,200) |
Ending balance | 1,216,220 | 1,621,301

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- Definition Employee Stock Ownership Plan (ESOP), Shares Sold From ESOP + References No definition available. + Details
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- Definition Employee Stock Ownership Plan (ESOP), Shares Utilized During Period + References No definition available. + Details
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- Definition Movement In Number Of Shares Held By Employee Stock Ownership Plan Trustees [Roll Forward] + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References 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=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References 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 + Details
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