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Authorised and issued share capital - Options Granted, WPP Share Option Plan 2015 (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 Share Option Plan 2015 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 20,397,150 | 18,691,100
WPP Share Option Plan 2015 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 1,396,745 |
WPP Share Option Plan 2015 [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 | 18,250 |
Exercise price per share | £ / shares | £ 8.372 |
Exercise dates | 2021 - 2025 |
WPP Share Option Plan 2015 [member] | Exercise price group 1 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 347,660 |
Exercise dates | 2021 - 2028 |
Exercise price per ADR | $ / ADRs | 53.140 |
WPP Share Option Plan 2015 [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 | 3,406,900 |
Exercise price per share | £ / shares | £ 8.372 |
Exercise dates | 2021 - 2028 |
WPP Share Option Plan 2015 [member] | Exercise price group 2 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 347,105 |
Exercise dates | 2022 - 2029 |
Exercise price per ADR | $ / ADRs | 62.590 |
WPP Share Option Plan 2015 [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 | 15,500 |
Exercise price per share | £ / shares | £ 9.600 |
Exercise dates | 2022 - 2026 |
WPP Share Option Plan 2015 [member] | Exercise price group 3 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 276,790 |
Exercise dates | 2020 - 2027 |
Exercise price per ADR | $ / ADRs | 88.260 |
WPP Share Option Plan 2015 [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 | 2,863,975 |
Exercise price per share | £ / shares | £ 9.600 |
Exercise dates | 2022 - 2029 |
WPP Share Option Plan 2015 [member] | Exercise price group 4 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 236,265 |
Exercise dates | 2020 - 2026 |
Exercise price per ADR | $ / ADRs | 105.490 |
WPP Share Option Plan 2015 [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 | 19,250 |
Exercise price per share | £ / shares | £ 13.085 |
Exercise dates | 2020 - 2024 |
WPP Share Option Plan 2015 [member] | Exercise price group 5 [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | ADRs | 188,925 |
Exercise dates | 2018 - 2025 |
Exercise price per ADR | $ / ADRs | 115.940 |
WPP Share Option Plan 2015 [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 | 2,785,100 |
Exercise price per share | £ / shares | £ 13.085 |
Exercise dates | 2020 - 2027 |
WPP Share Option Plan 2015 [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 | 55,500 |
Exercise price per share | £ / shares | £ 15.150 |
Exercise dates | 2018 - 2022 |
WPP Share Option Plan 2015 [member] | Exercise price group 8 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 1,952,200 |
Exercise price per share | £ / shares | £ 15.150 |
Exercise dates | 2018 - 2025 |
WPP Share Option Plan 2015 [member] | Exercise price group 9 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 5,375 |
Exercise price per share | £ / shares | £ 15.150 |
Exercise dates | 2019 - 2025 |
WPP Share Option Plan 2015 [member] | Exercise price group 10 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 12,375 |
Exercise price per share | £ / shares | £ 17.055 |
Exercise dates | 2019 - 2023 |
WPP Share Option Plan 2015 [member] | Exercise price group 11 [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Number of ordinary shares under option | 2,279,000 |
Exercise price per share | £ / shares | £ 17.055 |
Exercise dates | 2019 - 2026 |

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