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Taxes (Details 3) - Continuing operations [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [line items]      
Applicable tax rate 13.60% 11.70% 14.30%
Effect of disallowed expenditures 4.60% 4.80% 1.70%
Effect of utilization of tax losses brought forward from prior periods (0.30%) (0.10%) (0.10%)
Effect of income taxed at reduced rates (0.30%) (0.70%) (0.40%)
Tax rate effect of revenues exempt from taxation (0.70%) 0.00% (3.70%)
Effect of tax credits and allowances (2.30%) (2.30%) (2.30%)
Effect of release of contingent consideration liability (0.20%) (0.50%) (0.20%)
Effect of tax rate change on current and deferred tax assets and liabilities 0.30% (1.40%) (0.10%)
Effect of write-off of deferred tax assets 0.20% 4.00% 0.20%
Effect of write down and reversal of write down of investments in subsidiaries (0.80%) (0.60%) 0.00%
Effect of prior year items 2.30% 2.20% (0.50%)
Effect of other items 1.90% 3.00% 0.30%
Effective tax rate 18.30% 20.10% 9.20%
Effective income tax rate reconciliation other adjustments (0.10%) 0.40%  
Effective income tax rate reconciliation change in enacted tax rate 2.00% 2.60%  
Effect of income not subject to tax on divestment gain     (3.70%)
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce current tax expense $ 29 $ 11 $ 19