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Equity (Share-based Payments to Employees, Non-marketable Options, Grants Parameters) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
yr
Dec. 31, 2017
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Fair value $ 518,000,000 $ 631,000,000
Granted 2014 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Share price (in $) 8.2  
CPI-linked exercise price (in $) 8.4  
Fair value 8,400,000  
Weighted average grant date fair value per option (in $) 1.9  
Granted 2015 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Share price (in $) 7  
CPI-linked exercise price (in $) 7.2  
Fair value 9,000,000  
Weighted average grant date fair value per option (in $) 1.2  
Granted 2016 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Share price (in $) 3.9  
CPI-linked exercise price (in $) 4.3  
Fair value 4,000,000  
Weighted average grant date fair value per option (in $) 1.1  
Granted 2017 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Share price (in $) 4.5  
CPI-linked exercise price (in $) 4.3  
Fair value 11,300,000  
Weighted average grant date fair value per option (in $) 1.6  
Granted 2018 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Share price (in $) 4.4  
CPI-linked exercise price (in $) 4.3  
Fair value 8,800,000  
Weighted average grant date fair value per option (in $) $ 1.4  
First tranche [Member] | Granted 2014 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 29.40%  
Expected life of options (in years) | yr 4.3  
Risk-free interest rate (0.17%)  
First tranche [Member] | Granted 2015 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 25.40%  
Expected life of options (in years) | yr 3  
Risk-free interest rate (1.00%)  
First tranche [Member] | Granted 2016 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 30.51%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.01%  
First tranche [Member] | Granted 2017 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 31.88%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.37%  
First tranche [Member] | Granted 2018 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 28.86%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.03%  
Second tranche [Member] | Granted 2014 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 31.20%  
Expected life of options (in years) | yr 5.3  
Risk-free interest rate 0.05%  
Second tranche [Member] | Granted 2015 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 25.40%  
Expected life of options (in years) | yr 3  
Risk-free interest rate (1.00%)  
Second tranche [Member] | Granted 2016 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 30.51%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.01%  
Second tranche [Member] | Granted 2017 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 31.88%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.37%  
Second tranche [Member] | Granted 2018 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 28.86%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.03%  
Third tranche [Member] | Granted 2014 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 40.80%  
Expected life of options (in years) | yr 6.3  
Risk-free interest rate 0.24%  
Third tranche [Member] | Granted 2015 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 28.80%  
Expected life of options (in years) | yr 4  
Risk-free interest rate (0.88%)  
Third tranche [Member] | Granted 2016 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 30.51%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.01%  
Third tranche [Member] | Granted 2017 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 31.88%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.37%  
Third tranche [Member] | Granted 2018 [Member]    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Expected Volatility 28.86%  
Expected life of options (in years) | yr 7  
Risk-free interest rate 0.03%