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Net Debt - Summary of Movement in Net Debt (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Movement in net debt |  |  |
Net increase/(decrease) in cash and cash equivalents, net of overdrafts | $ 1,430 | $ (500) | $ 563
Add back financing cash flows in respect of other components of net debt: |  |  |
Principal element of lease payments | 65 | 59 | 35
Issue of long-term bonds, including effect of currency swaps | (1,093) |  | (554)
Issue of commercial paper | (738) |  |
Repayment of long-term bonds | 290 |  |
Decrease/(increase) in other borrowings | 125 | (127) | 268
Decrease/(increase) in net debt arising from cash flows | 79 | (568) |
Other movements: |  |  |
Lease liabilities | 144 | (43) |
Increase in accrued interest | (5) | (7) |
Acquisitions and disposals | 19 | (25) |
Exchange and other adjustments | (101) | (57) |
Decrease/(increase) in net debt | 136 | (700) |
Net debt at beginning of the year | (2,665) | (1,965) |
Net debt at end of the year | $ (2,529) | $ (2,665) | $ (1,965)

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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 21 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_21&doctype=Standard -URIDate 2020-01-01 + Details
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