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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
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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

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- Definition Adjustments for finance costs to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Finance costs; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_c&doctype=Standard -URIDate 2018-03-16 + Details
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