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Condensed consolidating financial information for bonds issued by WPP Finance 2010 with WPP plc as parent guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as subsidiary guarantors - Additional Information (Detail) - USD ($) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Disclosure of detailed information of condensed consolidating financial information [line items] |  |
Ownership percentage in subsidiaries | 100.00% |
US$ bonds due September 2022 [member] |  |
Disclosure of detailed information of condensed consolidating financial information [line items] |  |
Bond amount | $ 500,000,000 |
Interest rate | 3.625% |
US$ bonds due September 2042 [member] |  |
Disclosure of detailed information of condensed consolidating financial information [line items] |  |
Bond amount | $ 93,000,000 |
Interest rate | 5.125% |
Repayment of bonds | $ 179,000,000 | $ 28,000,000
Bond amount initially issued | 300,000,000 |
US$ bonds due November 2021 [member] |  |
Disclosure of detailed information of condensed consolidating financial information [line items] |  |
Bond amount | $ 812,000,000 |
Interest rate | 4.75% |

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