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Classification and measurement of financial instruments - Summary of Fair Value Measurement Hierarchy of Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
Derivative financial instruments $ (13) $ (19)  
Liabilities      
Derivative financial instruments (18) (20)  
Contingent purchase consideration (79) (91)  
Deferred purchase consideration (11) (23)  
Loans and other borrowings (3,767) (2,165)  
Deferred compensation plan liabilities (236) (218) $ (193)
Deferred purchase consideration [member]      
Liabilities      
Deferred purchase consideration (24) (23)  
Money Market Fund [Member]      
Assets      
Financial assets 907 51  
Deferred Compensation Plan Investments [Member]      
Assets      
Financial assets 236 218  
Quoted equity shares [member]      
Assets      
Equity securities 88 133  
Financial assets at fair value through profit or loss, category [member]      
Assets      
Financial assets 1,148 273 [1]  
Financial assets at fair value through profit or loss, category [member] | Money Market Fund [Member]      
Assets      
Financial assets [1]   3  
Financial assets at fair value through profit or loss, category [member] | Trade deposits and loans [member]      
Assets      
Financial assets   3  
GBP173m 3.875% bonds 2022 [member]      
Liabilities      
Loans and other borrowings (235) (528)  
EUR500m 1.625% bonds 2024 [member]      
Liabilities      
Loans and other borrowings (611)    
GBP300m 3.75% bonds 2025 [member]      
Liabilities      
Loans and other borrowings (413) (399)  
GBP350m 2.125% bonds 2026 [member]      
Liabilities      
Loans and other borrowings (479) (462)  
EUR500m 2.125% bonds 2027 [member]      
Liabilities      
Loans and other borrowings (618) (564)  
GBP400m 3.375% bonds 2028 [member]      
Liabilities      
Loans and other borrowings (542)    
Fair value [member]      
Assets      
Derivative financial instruments 5 1  
Liabilities      
Derivative financial instruments (18) (20)  
Contingent purchase consideration (79) (91)  
Deferred purchase consideration (26) (24)  
Deferred compensation plan liabilities (236) (218)  
Fair value [member] | Money Market Fund [Member]      
Assets      
Financial assets 907 51  
Fair value [member] | Trade deposits and loans [member]      
Assets      
Financial assets   3  
Fair value [member] | Deferred Compensation Plan Investments [Member]      
Assets      
Financial assets 236 218  
Fair value [member] | Quoted equity shares [member]      
Assets      
Equity securities 88 133  
Fair value [member] | GBP173m 3.875% bonds 2022 [member]      
Liabilities      
Loans and other borrowings (248) (567)  
Fair value [member] | EUR500m 1.625% bonds 2024 [member]      
Liabilities      
Loans and other borrowings (630)    
Fair value [member] | GBP300m 3.75% bonds 2025 [member]      
Liabilities      
Loans and other borrowings (448) (435)  
Fair value [member] | GBP350m 2.125% bonds 2026 [member]      
Liabilities      
Loans and other borrowings (489) (465)  
Fair value [member] | EUR500m 2.125% bonds 2027 [member]      
Liabilities      
Loans and other borrowings (650) (601)  
Fair value [member] | GBP400m 3.375% bonds 2028 [member]      
Liabilities      
Loans and other borrowings (603)    
Level 1 [member] | Fair value [member]      
Liabilities      
Deferred purchase consideration (26) (24)  
Deferred compensation plan liabilities (236) (218)  
Level 1 [member] | Fair value [member] | Money Market Fund [Member]      
Assets      
Financial assets 907 51  
Level 1 [member] | Fair value [member] | Deferred Compensation Plan Investments [Member]      
Assets      
Financial assets 236 218  
Level 1 [member] | Fair value [member] | Quoted equity shares [member]      
Assets      
Equity securities   8  
Level 1 [member] | Fair value [member] | GBP173m 3.875% bonds 2022 [member]      
Liabilities      
Loans and other borrowings (248) (567)  
Level 1 [member] | Fair value [member] | EUR500m 1.625% bonds 2024 [member]      
Liabilities      
Loans and other borrowings (630)    
Level 1 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member]      
Liabilities      
Loans and other borrowings (448) (435)  
Level 1 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member]      
Liabilities      
Loans and other borrowings (489) (465)  
Level 1 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member]      
Liabilities      
Loans and other borrowings (650) (601)  
Level 1 [member] | Fair value [member] | GBP400m 3.375% bonds 2028 [member]      
Liabilities      
Loans and other borrowings (603)    
Level 2 [member] | Fair value [member]      
Assets      
Derivative financial instruments 1 1  
Liabilities      
Derivative financial instruments (18) (20)  
Level 3 [member] | Trade deposits and loans [member]      
Assets      
Financial assets   3  
Level 3 [member] | Fair value [member]      
Assets      
Derivative financial instruments 4    
Liabilities      
Contingent purchase consideration (79) (91)  
Level 3 [member] | Fair value [member] | Quoted equity shares [member]      
Assets      
Equity securities $ 88 $ 125  
[1] Restated for deferred compensation plan investments, see page 134.