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Condensed consolidating financial information for bonds issued by WPP Finance 2010 with WPP plc as parent guarantor and WPP Jubilee Limited and WPP 2005 Limited as subsidiary guarantors - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information of condensed consolidating financial information [line items]    
Ownership percentage in subsidiaries 100.00% 100.00%
US$ bonds due September 2024 [member]    
Disclosure of detailed information of condensed consolidating financial information [line items]    
Bond amount $ 750,000,000 $ 750,000,000
Interest rate 3.75% 3.75%
US$ bonds due November 2043 [member]    
Disclosure of detailed information of condensed consolidating financial information [line items]    
Bond amount $ 500,000,000 $ 500,000,000
Interest rate 5.625% 5.625%
Outstanding bond amount $ 450,000,000 $ 450,000,000
Bonds repayment amount $ 50,000,000 $ 50,000,000