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Reconciliation of profit for the year to cash flow from operations - Summary of Reconciliation of Profit for the Year to Cash Flow From Operations Before Contract Acquisition Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of profit or loss to net cash flows from operating activities [abstract]      
Profit for the year $ 352 $ 541 $ 459
Adjustments for:      
Net financial expenses 81 72 80
Income tax charge 133 115 173
Depreciation and amortisation 80 78 75
System Fund depreciation and amortisation 45 36 31
Impairment 0 18 16
Other exceptional items (including System Fund) 151 (13) 13
Equity-settled share-based cost 38 27 23
Dividends from associates and joint ventures 5 4 5
Increase in trade and other receivables (44) (71) (27)
Increase in contract costs (3) (5) (4)
Increase in deferred revenue 141 43 109
Increase in other trade and other payables 7 35 39
Utilisation of provisions (2016: net of insurance recovery) (6)   (4)
Retirement benefit contributions, net of costs (12) (1) (32)
Cash flows relating to exceptional items (137) (44) (19)
Contract assets deduction in revenue 19 17 13
Other items 4 (3)  
Total adjustments 502 308 491
Cash flow from operations before contract acquisition costs $ 854 $ 849 $ 950