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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Movement in net debt |  |  |
Net (decrease)/increase in cash and cash equivalents, net of overdrafts | $ (236) | $ 1,430 | $ (500)
Add back financing cash flows in respect of other components of net debt: |  |  |
Principal element of lease payments | 32 | 65 | 59
Issue of long-term bonds, including effect of currency swaps |  | (1,093) |
Repayment/(issue) of commercial paper | 828 | (738) |
Repayment of long-term bonds |  | 290 |
Decrease in other borrowings |  | 125 | (127)
Total financing cash flows in respect of other components of net debt | 860 | (1,351) |
Decrease in net debt arising from cash flows | 624 | 79 |
Other movements: |  |  |
Lease liabilities | (7) | 144 |
Increase in accrued interest | (1) | (5) |
Disposals | 3 | 19 |
Exchange and other adjustments | 29 | (101) |
Total other movements | 24 | 57 |
Decrease in net debt | 648 | 136 |
Net debt at beginning of the year | (2,529) | (2,665) |
Net debt at end of the year | $ (1,881) | $ (2,529) | $ (2,665)

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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 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 21 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_21&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard -URIDate 2021-03-24 + Details
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