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Exceptional Items - Summary of Exceptional Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other operating income and expenses:      
Other operating income and expenses $ 14 $ 11 $ 9
Impairment charges      
Impairment charges 0 (18) (16)
Profit before tax 485 656 632
Tax on exceptional items 27 88 12
Tax (133) (115) (173)
Exceptional items before tax analysed as:      
Exceptional items before tax (104) 4 (29)
Americas [member]      
Impairment charges      
Impairment charges   (18) (16)
Exceptional items [member]      
Administrative expenses:      
Acquisition and integration costs (15) (15) (13)
Litigation (18)    
Reorganisation costs (56) (36)  
Pension settlement cost (15)    
Administrative expenses (104) (51) (13)
Other operating income and expenses:      
Gain on disposal of equity securities measured at fair value 0 73  
Other operating income and expenses 0 73  
Impairment charges      
Impairment charges 0 (18) (16)
Profit before tax (104) 4 (29)
Tax on exceptional items 22 (2) 12
Exceptional tax 5 90  
Tax 27 88 12
Exceptional items before tax analysed as:      
Exceptional items before tax (104) 4 (29)
Exceptional items [member] | Associates [member]      
Impairment charges      
Associates 0 (18) (16)
Exceptional items [member] | Americas [member]      
Exceptional items before tax analysed as:      
Exceptional items before tax (36) 37 $ (29)
Exceptional items [member] | EMEAA [member]      
Exceptional items before tax analysed as:      
Exceptional items before tax (12) (4)  
Exceptional items [member] | Greater China [member]      
Exceptional items before tax analysed as:      
Exceptional items before tax (1)    
Exceptional items [member] | Central [member]      
Exceptional items before tax analysed as:      
Exceptional items before tax $ (55) $ (29)