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Net Debt - Summary of Movement in Net Debt (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement in net debt |  |  |
Net increase/(decrease) in cash and cash equivalents, net of overdrafts | $ 563 | $ (75) | $ (920)
Add back cash flows in respect of other components of net debt: |  |  |
Issue of long-term bonds, including effect of currency swaps | (554) |  | (459)
Decrease/(increase) in other borrowings | 268 | (153) | (109)
Decrease/(increase) in net debt arising from cash flows | 277 | (228) |
Non-cash movements: |  |  |
Finance lease obligations | (4) | (4) |
(Increase)/decrease in accrued interest | (3) | 1 |
Exchange and other adjustments | 51 | (114) |
Decrease/(increase) in net debt | 321 | (345) |
Net debt at beginning of the year | (1,851) | (1,506) |
Net debt at end of the year | $ (1,530) | $ (1,851) | $ (1,506)

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- Definition The increase (decrease) in cash and cash equivalents before the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of net debt of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Inflows (outflows) of cash, classified as financing activities, that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 21 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_21&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The cash inflow from the issuing of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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