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Performance B.6.1 Income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax (charge) credit      
Withholding tax $ (64) $ (74) $ (44)
Other income tax relating to the current year (86) (85) (74)
Current tax expense (income) (150) (159) (118)
Adjustments in respect of prior years 1 (12) (26)
Current tax expense (income) and adjustments (149) (171) (144)
Deferred tax (charge) credit      
Origination and reversal of temporary differences 32 15 45
Effect of change in tax rates (10) 19 1
Tax income (expense) before valuation allowances 22 34 46
Effect of valuation allowances (8) (30) (88)
Deferred tax expense (income) 14 4 (42)
Adjustments in respect of prior years 19 9 7
Deferred tax expense (income) and adjustments 33 13 (35)
Income Tax Calculation:      
Profit before tax 129 176 109
Tax at the weighted average statutory rate (5) (12) 9
Effect of:      
Items taxed at a different rate 7 (11) 13
Change in tax rates on deferred tax balances (10) 19 1
Expenditure not deductible and income not taxable (59) (66) (65)
Unrelieved withholding tax (64) (73) (43)
Accounting for associates and joint ventures 5 17 29
Movement in deferred tax on unremitted earnings (2) 1 (16)
Unrecognized deferred tax assets (8) (31) (105)
Recognition of previously unrecognized deferred tax assets 0 1 17
Adjustments in respect of prior years 20 (3) (19)
Total tax (charge) credit $ (116) $ (158) [1] $ (179) [1]
Weighted average statutory tax rate 3.90% 6.82% (8.26%)
Effective tax rate 89.90% 89.77% 164.22%
Discontinued operations      
Income Tax Calculation:      
Profit before tax $ (39) $ 51 $ (26)
Tax at the weighted average statutory rate 4 (10) 6
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 (2) 7 8
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 (2) (10) (15)
Recognition of previously unrecognized deferred tax assets 0 13 0
Adjustments in respect of prior years 0 0 7
Total tax (charge) credit 0 0 6
Aggregate continuing and discontinued operations [member]      
Income Tax Calculation:      
Profit before tax 90 227 83
Tax at the weighted average statutory rate (1) (22) 15
Effect of:      
Items taxed at a different rate 7 (11) 13
Change in tax rates on deferred tax balances (10) 19 1
Expenditure not deductible and income not taxable (61) (59) (57)
Unrelieved withholding tax (64) (73) (43)
Accounting for associates and joint ventures 5 17 29
Movement in deferred tax on unremitted earnings (2) 1 (16)
Unrecognized deferred tax assets (10) (41) (120)
Recognition of previously unrecognized deferred tax assets 0 14 17
Adjustments in respect of prior years 20 (3) (12)
Total tax (charge) credit $ (116) $ (158) $ (173)
Weighted average statutory tax rate 1.10% 9.69% (17.90%)
Effective tax rate 128.90% 69.60% 207.10%
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 40.00% 40.00% 40.00%
[1] Re-presented for discontinued operations (shown in note A.4.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.