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Authorised and issued share capital - Options Granted, WPP Worldwide Share Ownership Program (Detail) | 12 Months Ended |
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Dec. 31, 2019 shares ADRs £ / shares $ / ADRs | Dec. 31, 2018 shares
Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 25,105,815 | 24,218,615
WPP Worldwide Share Ownership Program [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 4,701,924 | 5,520,774
WPP Worldwide Share Ownership Program [member] | Exercise price group 1 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 82,650 |
Exercise price per share | £ / shares | £ 6.268 |
Exercise dates | 2014 - 2021 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 1 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ADRs under option | ADRs | 24,550 |
Exercise dates | 2014 - 2021 |
Exercise price per ADR | $ / ADRs | 49.230 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 2 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 36,500 |
Exercise price per share | £ / shares | £ 6.268 |
Exercise dates | 2015 - 2021 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 2 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ADRs under option | ADRs | 16,530 |
Exercise dates | 2013 - 2020 |
Exercise price per ADR | $ / ADRs | 56.560 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 3 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 53,150 |
Exercise price per share | £ / shares | £ 7.113 |
Exercise dates | 2013 - 2020 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 3 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ADRs under option | ADRs | 39,184 |
Exercise dates | 2015 - 2022 |
Exercise price per ADR | $ / ADRs | 67.490 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 4 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 25,750 |
Exercise price per share | £ / shares | £ 7.113 |
Exercise dates | 2014 - 2020 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 4 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ADRs under option | ADRs | 166,655 |
Exercise dates | 2017 - 2024 |
Exercise price per ADR | $ / ADRs | 102.670 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 5 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 194,079 |
Exercise price per share | £ / shares | £ 8.458 |
Exercise dates | 2015 - 2022 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 5 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ADRs under option | ADRs | 141,935 |
Exercise dates | 2016 - 2023 |
Exercise price per ADR | $ / ADRs | 110.760 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 6 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 43,000 |
Exercise price per share | £ / shares | £ 13.145 |
Exercise dates | 2017 - 2021 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 7 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 1,739,050 |
Exercise price per share | £ / shares | £ 13.145 |
Exercise dates | 2017 - 2024 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 8 [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 4,375 |
Exercise price per share | £ / shares | £ 13.145 |
Exercise dates | 2018 - 2024 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 9 [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 564,975 |
Exercise price per share | £ / shares | £ 13.505 |
Exercise dates | 2016 - 2023 |
WPP Worldwide Share Ownership Program [member] | Exercise price group 10 [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 14,125 |
Exercise price per share | £ / shares | £ 13.505 |
Exercise dates | 2017 - 2023 |

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