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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details) | 12 Months Ended |  |
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Dec. 31, 2022 £ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2022 $ / shares | Dec. 31, 2021 £ / shares | Dec. 31, 2021 $ / shares
Own shares held by ESOP |  |  |  |  |
Movement in Number of Shares held by ESOP Trustees [Roll Forward] |  |  |  |  |
Shares sold from the ESOP during the year |  | (100,000) |  |  |
Deferred shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares | £ 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 | (15,977,968,688) |  |  |  |
Ending balance | 0 |  |  |  |
Ordinary shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | (per share) | £ 0.50 | $ 0.50 | $ 0.50 | 0.50 | $ 0.50
Movement in Number of Shares held by ESOP Trustees [Roll Forward] |  |  |  |  |
Shares utilized during the year | (117,297) |  |  |  |
Shares sold from the ESOP during the year | 0 |  |  |  |
Ordinary shares | Own shares held by ESOP |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares | £ 0.50 |  |  | £ 0.50 |
Movement in Number of Shares held by ESOP Trustees [Roll Forward] |  |  |  |  |
Beginning balance | 838,558 |  |  |  |
Ending balance | 721,261 |  |  |  |

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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 https://asc.fasb.org/extlink&oid=120391452&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 https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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