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Equity (Share-based Payments to Employees, Non-marketable Options, Grants Parameters) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) yr | Dec. 31, 2016 USD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Fair value | $ 631,000,000 | $ 552,000,000
2014 Plan [Member] | 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 |
2014 Plan [Member] | Granted 2015 [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Share price (in $) | 7.0 |
CPI-linked exercise price (in $) | 7.2 |
Fair value | 9,000,000 |
Weighted average grant date fair value per option (in $) | 1.2 |
2014 Plan [Member] | 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 |
2014 Plan [Member] | 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 $) | $ 1.58 |
First tranche [Member] | 2014 Plan [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] | 2014 Plan [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 | 3.0 |
Risk-free interest rate | (1.00%) |
First tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.01% |
First tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.37% |
Second tranche [Member] | 2014 Plan [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] | 2014 Plan [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 | 3.0 |
Risk-free interest rate | (1.00%) |
Second tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.01% |
Second tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.37% |
Third tranche [Member] | 2014 Plan [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] | 2014 Plan [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 | 4.0 |
Risk-free interest rate | (0.88%) |
Third tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.01% |
Third tranche [Member] | 2014 Plan [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 | 7.0 |
Risk-free interest rate | 0.37% |

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