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Performance B.6.1 Income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax (charge) credit      
Withholding tax $ (56) $ (64) $ (74)
Other income tax relating to the current year (88) (82) (81)
Adjustments in respect of prior years (7) 1 (21)
Current tax expense (income) and adjustments (151) (145) (176)
Deferred tax (charge) credit      
Origination and reversal of temporary differences 58 32 15
Effect of change in tax rates (8) (10) 19
Tax income (expense) before valuation allowances 50 22 34
Effect of valuation allowances (9) (8) (28)
Deferred tax expense (income) 41 14 6
Adjustments in respect of prior years (10) 19 8
Deferred tax expense (income) and adjustments 31 33 14
Income Tax Calculation:      
Profit before tax 218 119 171
Tax at the weighted average statutory rate (37) (1) (10)
Effect of:      
Items taxed at a different rate (1) 7 (11)
Change in tax rates on deferred tax balances (8) (10) 19
Expenditure not deductible and income not taxable (37) (59) (64)
Unrelieved withholding tax (56) (64) (73)
Accounting for associates and joint ventures 36 5 17
Movement in deferred tax on unremitted earnings 9 (2) 1
Unrecognized deferred tax assets (20) (8) (29)
Recognition of previously unrecognized deferred tax assets 11 0 1
Adjustments in respect of prior years (17) 20 (13)
Total tax (charge) credit $ (120) $ (112) [1] $ (162) [1]
Weighted average statutory tax rate 17.00% 0.80% 5.80%
Effective tax rate 55.00% 94.10% 94.70%
Discontinued operations      
Income Tax Calculation:      
Profit before tax $ 59 $ (29) $ 56
Tax at the weighted average statutory rate (11) 0 (12)
Effect of:      
Items taxed at a different rate 0 0 0
Change in tax rates on deferred tax balances 0 0 0
Expenditure not deductible and income not taxable 9 (2) 5
Unrelieved withholding tax 0 0 0
Accounting for associates and joint ventures 0 0 0
Movement in deferred tax on unremitted earnings 0 0 0
Unrecognized deferred tax assets 0 (2) (12)
Recognition of previously unrecognized deferred tax assets 0 0 13
Adjustments in respect of prior years 0 0 10
Total tax (charge) credit (2) (4) 4
Aggregate continuing and discontinued operations      
Income Tax Calculation:      
Profit before tax 277 90 227
Tax at the weighted average statutory rate (48) (1) (22)
Effect of:      
Items taxed at a different rate (1) 7 (11)
Change in tax rates on deferred tax balances (8) (10) 19
Expenditure not deductible and income not taxable (28) (61) (59)
Unrelieved withholding tax (56) (64) (73)
Accounting for associates and joint ventures 36 5 17
Movement in deferred tax on unremitted earnings 9 (2) 1
Unrecognized deferred tax assets (20) (10) (41)
Recognition of previously unrecognized deferred tax assets 11 0 14
Adjustments in respect of prior years (17) 20 (3)
Total tax (charge) credit $ (122) $ (116) $ (158)
Weighted average statutory tax rate 17.30% 1.10% 9.70%
Effective tax rate 44.00% 128.90% 69.60%
Bottom of range      
Effect of:      
Weighted average statutory tax rate 10.00% 10.00% 10.00%
Top of range      
Effect of:      
Weighted average statutory tax rate 35.00% 37.00% 40.00%
[1] Re-presented for discontinued operations (shown in note A.4.) 2018 and 2017 were not restated for the application of IFRS 16, and, additionally, 2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.