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Equity (Dividends Distributed to the Company's Shareholders) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Mar. 18, 2020
February 14, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Apr. 04, 2017
Gross amount of the dividend distributed (in millions of $) $ 57
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 57
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
May 9, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Jun. 20, 2017
Gross amount of the dividend distributed (in millions of $) $ 34
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 32
Amount of the dividend per share (in dollar) | $ / shares $ 0.03
August 2, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Sep. 13, 2017
Gross amount of the dividend distributed (in millions of $) $ 32
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 32
Amount of the dividend per share (in dollar) | $ / shares $ 0.02
November 7, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Dec. 20, 2017
Gross amount of the dividend distributed (in millions of $) $ 57
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 56
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
February 13, 2018 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Mar. 14, 2018
Gross amount of the dividend distributed (in millions of $) $ 70
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 69
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
May 10, 2018 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Jun. 20, 2018
Gross amount of the dividend distributed (in millions of $) $ 52
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 51
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
July 31, 2018 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Sep. 04, 2018
Gross amount of the dividend distributed (in millions of $) $ 56
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 56
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
October 31, 2018 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Dec. 19, 2018
Gross amount of the dividend distributed (in millions of $) $ 66
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 65
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
February 5, 2019 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Mar. 13, 2019
Gross amount of the dividend distributed (in millions of $) $ 62
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 61
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
May 7, 2019 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Jun. 19, 2019
Gross amount of the dividend distributed (in millions of $) $ 76
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 75
Amount of the dividend per share (in dollar) | $ / shares $ 0.06
July 31, 2019 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Sep. 24, 2019
Gross amount of the dividend distributed (in millions of $) $ 74
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 73
Amount of the dividend per share (in dollar) | $ / shares $ 0.06
November 6, 2019 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend Dec. 18, 2019
Gross amount of the dividend distributed (in millions of $) $ 65
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 64
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
February 12, 2020 (after the reporting date) [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Gross amount of the dividend distributed (in millions of $) $ 23 [1]
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 22 [1]
Amount of the dividend per share (in dollar) | $ / shares $ 0.02 [1]
[1] The record date is March 4, 2020 and the payment date is March 18, 2020.