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Authorised and issued share capital - Movements and Weighted-average Exercise Price for Options Granted (Detail) | 12 Months Ended
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Dec. 31, 2019 shares £ / shares $ / ADRs | Dec. 31, 2018 shares £ / shares $ / ADRs | Dec. 31, 2017 shares
American depository receipts [member] | WPP Worldwide Share Ownership Program [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Weighted-average exercise price for options, 1 January | $ / ADRs | 95.453 |  |
Weighted-average exercise price for options, Exercised | $ / ADRs | 47.388 |  |
Weighted-average exercise price for options, Lapsed | $ / ADRs | 91.622 |  |
Weighted-average exercise price for options, Outstanding 31 December | $ / ADRs | 96.744 | 95.453 |
Weighted-average exercise price for options, Exercisable | $ / ADRs | 96.744 |  |
American depository receipts [member] | WPP Share Option Plan 2015 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Weighted-average exercise price for options, 1 January | $ / ADRs | 84.893 |  |
Weighted-average exercise price for options, Granted | $ / ADRs | 62.590 |  |
Weighted-average exercise price for options, Exercised | $ / ADRs | 53.140 |  |
Weighted-average exercise price for options, Lapsed | $ / ADRs | 82.290 |  |
Weighted-average exercise price for options, Outstanding 31 December | $ / ADRs | 79.798 | 84.893 |
Weighted-average exercise price for options, Exercisable | $ / ADRs | 115.940 |  |
Ordinary shares [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Options granted, Beginning balance | 24,218,615 |  |
Options granted, Granted | 4,615,000 |  |
Exercise of share options | (75,625) | (166,675) | (630,822)
Options granted, Lapsed | (3,652,175) |  |
Options granted, Ending balance | 25,105,815 | 24,218,615 |
Options granted, Exercisable | 9,957,740 |  |
Ordinary shares [member] | WPP Executive Share Option Scheme [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Options granted, Beginning balance | 6,741 |  |
Options granted, Ending balance | 6,741 | 6,741 |
Options granted, Exercisable | 6,741 |  |
Weighted-average exercise price for options, 1 January | £ / shares | £ 9.355 |  |
Weighted-average exercise price for options, Outstanding 31 December | £ / shares | 9.355 | £ 9.355 |
Weighted-average exercise price for options, Exercisable | £ / shares | £ 9.355 |  |
Ordinary shares [member] | WPP Worldwide Share Ownership Program [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Options granted, Beginning balance | 5,520,774 |  |
Exercise of share options | (71,475) |  |
Options granted, Lapsed | (747,375) |  |
Options granted, Ending balance | 4,701,924 | 5,520,774 |
Options granted, Exercisable | 4,701,924 |  |
Weighted-average exercise price for options, 1 January | £ / shares | £ 12.290 |  |
Weighted-average exercise price for options, Exercised | £ / shares | 6.888 |  |
Weighted-average exercise price for options, Lapsed | £ / shares | 12.027 |  |
Weighted-average exercise price for options, Outstanding 31 December | £ / shares | 12.421 | £ 12.290 |
Weighted-average exercise price for options, Exercisable | £ / shares | £ 12.421 |  |
Ordinary shares [member] | WPP Share Option Plan 2015 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Options granted, Beginning balance | 18,691,100 |  |
Options granted, Granted | 4,615,000 |  |
Exercise of share options | (4,150) |  |
Options granted, Lapsed | (2,904,800) |  |
Options granted, Ending balance | 20,397,150 | 18,691,100 |
Options granted, Exercisable | 5,249,075 |  |
Weighted-average exercise price for options, 1 January | £ / shares | £ 12.753 |  |
Weighted-average exercise price for options, Granted | £ / shares | 9.600 |  |
Weighted-average exercise price for options, Exercised | £ / shares | 8.372 |  |
Weighted-average exercise price for options, Lapsed | £ / shares | 12.405 |  |
Weighted-average exercise price for options, Outstanding 31 December | £ / shares | 12.121 | £ 12.753 |
Weighted-average exercise price for options, Exercisable | £ / shares | £ 16.164 |  |

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