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Exceptional Items - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 EUR (€)
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets |  | $ (93) |  |  |  |
Derecognition of lease liabilities |  | 71 |  |  |  |
Gain on termination of lease |  | 30 |  |  |  |
Fair value gains/(losses) on contingent purchase consideration | $ 6 | 13 |  | $ 27 |  |
Repayments of bonds, notes and debentures |  | 290 |  |  |  |
Non-current assets | 2,650 | 2,796 |  |  |  |
Lease liabilities | 419 | 450 |  |  |  |
Impairment loss |  | 4 |  |  |  |
Provisions charged to income statement (incl onerous contracts) | 40 |  |  |  |  |
Impairment loss on financial assets | 0 | 88 |  | $ 8 |  |
Derecognition of right of use assets and lease liabilities | $ 0 | $ 22 |  |  |  |
Applicable tax rate | 19.00% | 19.00% | 19.00% | 19.00% |  |
Tax rate effect from change in tax rate | (7.00%) | 2.90% | 2.90% | (0.40%) |  |
Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  | $ 8 |  |  |  |
EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets | $ 9 | 9 |  |  |  |
Right-of-use assets [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss | 0 |  |  |  |  |
Derecognition of right of use assets net book value |  | 49 |  |  |  |
Right-of-use assets [member] | EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss |  | $ 5 |  |  |  |
2022 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | £ |  |  |  |  | £ 400 |
Repayments of bonds, notes and debentures | £ |  |  | £ 227 |  |  |
Bond interest rate |  | 3.875% |  |  | 3.875% | 3.875%
Maturity date |  | October 08, 2022 | October 08, 2022 |  |  |
2024 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 500
Bond interest rate |  | 1.625% |  |  | 1.625% | 1.625%
Maturity date |  | October 08, 2024 | October 08, 2024 |  |  |
2028 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | £ |  |  |  |  | £ 400 |
Bond interest rate |  | 3.375% |  |  | 3.375% | 3.375%
Maturity date |  | October 08, 2028 | October 08, 2028 |  |  |
UK Portfolio [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets |  | $ 22 |  |  |  |
Derecognition of lease liabilities |  | 40 |  |  |  |
Non-current assets | 0 | 0 |  |  |  |
Lease liabilities | 0 | 0 |  |  |  |
Contingent consideration recognised as of acquisition date | 0 | 0 |  |  |  |
Derecognition of right of use assets and lease liabilities |  | 18 |  |  |  |
Exceptional items [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  | 4 |  |  |  |
Exceptional items [member] | Onerous Contracts Provisions [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Provisions charged to income statement (incl onerous contracts) |  | 10 |  |  |  |
Exceptional items [member] | EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Litigation settlement amount |  | 14 |  |  |  |
Exceptional items [member] | UK Portfolio [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Fair value gains/(losses) on contingent purchase consideration |  | 21 |  | $ 38 |  |
Impairment on goodwill |  |  |  | 49 |  |
Derecognition of right of use assets and lease liabilities |  | 18 |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  | 4 |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Onerous Contracts Provisions [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Provisions charged to income statement (incl onerous contracts) |  | 10 |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Right-of-use assets [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss |  |  |  | 32 |  |
Gain on Lease Termination [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets |  | 60 |  |  |  |
Derecognition of lease liabilities |  | 90 |  |  |  |
Exceptional Tax Items [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Exceptional Tax Credit Amount | $ 26 |  |  |  |  |
Applicable tax rate | 19.00% |  |  |  |  |
Tax rate effect from change in tax rate | 25.00% |  |  |  |  |
Deferred tax credit arising from remasurement of Siginificant US deferred tax reforms | $ 4 |  |  |  |  |
Tax effect from change in tax rate | 34 |  |  |  |  |
Consultancy expense [member] | Exceptional items [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  |  |  | 6 |  |
Severance Costs [member] | Exceptional items [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  |  |  | 8 |  |
System Fund [member] | Exceptional items [member] | Administrative Expenses [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  | 20 |  | $ 28 |  |
SVC [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets |  | 33 |  |  |  |
Trade deposits and loans [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets | $ (15) | $ (15) |  |  |  |

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