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Authorised and issued share capital - Options Granted, WPP Executive Share Option Scheme (Detail) - Ordinary shares [member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 shares £ / shares | Dec. 31, 2018 shares
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 Executive Share Option Scheme [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 6,741 | 6,741
WPP Executive Share Option Scheme [member] | Exercise price group 1 [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 3,696 |
Exercise price per share | £ / shares | £ 8.333 |
Exercise dates | 2015 - 2022 |
WPP Executive Share Option Scheme [member] | Exercise price group 2 [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 3,045 |
Exercise price per share | £ / shares | £ 10.595 |
Exercise dates | 2016 - 2023 |

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