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Tax - Summary of Reconciliation of Tax Charge (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of income tax reconciliation [line items] |  |  |
Net effect of different rates of tax in overseas businesses | 6.80% | (4.50%) | 6.70%
Tax rate effect from change in tax rate | (7.00%) | 2.90% | (0.40%)
UK [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Tax rate effect from change in tax rate | 7.10% | 7.90% |
UK [Member] | Maximum [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Change in future UK corporation tax rate | 25.00% |  |
UK [Member] | Bottom of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Change in future UK corporation tax rate | 19.00% |  |
Before exceptional items and System Funds [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Net effect of different rates of tax in overseas businesses | 6.90% | 18.90% | 5.50%
Tax rate effect from change in tax rate |  | (9.60%) | (0.30%)
Before exceptional items and System Funds [member] | United States [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Net effect of different rates of tax in overseas businesses | 6.70% | 18.90% | 4.90%

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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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