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Exceptional items - Summary of Tax Impacts On Exceptional Items (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | $ 143 | $ 34 | $ 159
Deferred tax expense | (47) | (54) | (3)
Total current and deferred tax | 96 | (20) | 156
Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | (2) | 14 | 4
Deferred tax expense | 5 | 38 | 16
Total current and deferred tax | 3 | 52 | 20
Derecognition of right-of-use assets and lease liabilities | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 |  |
Deferred tax expense | 0 | (4) |
Provision for onerous contractual expenditure | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 |  |
Deferred tax expense | 0 | 2 |
Reorganisation costs | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 | 3 | 4
Deferred tax expense | 0 | 2 |
Acquisition and integration costs | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 | 1 |
Deferred tax expense | 0 |  |
Litigation | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 |  |
Deferred tax expense | 4 |  | 6
Impairment loss on financial assets | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 | 4 |
Deferred tax expense | 0 | 2 |
Other impairment charges | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 | 6 |
Deferred tax expense | 1 | 37 | 18
Financial Expenses [Member] | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 |  |
Deferred tax expense | 0 | 3 |
Fair value gains on contingent purchase consideration | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 0 |  |
Deferred tax expense | 0 | $ (4) | (6)
Adjustments in respect of prior years | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | (2) |  |
Deferred tax expense | $ 0 |  | $ (2)

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