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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Maximum payouts as per guarantee | $ 72 | $ 85 |
Impairment charges | 53 |  |
Non-SVC contract asset [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Impairment charges | 20 |  |
SVC contract asset [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Impairment charges | 33 |  |
System Fund [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Increase decrease in revenue of central segment | 20 | 18 | $ 15
Increase decrease in operating profit of central segment | 21 | 22 | $ 20
Americas [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Impairment charges | $ 42 |  |
Americas [Member] | Minimum [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 8.40% |  |
Americas [Member] | Maximum [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 9.30% |  |
EMEAA [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 14.10% |  |
Impairment charges | $ 11 |  |
Greater China [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 13.30% |  |
Europe [Member] | Minimum [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 9.50% |  |
Europe [Member] | Maximum [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Discount rate | 10.40% |  |
Performance Guarantees [member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Performance guarantees included within trade and other payables | $ 1 | $ 2 |

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- Definition The decrease in contract assets resulting from impairment. [Refer: Contract assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_c&doctype=Standard -URIDate 2020-01-01 + Details
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