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Property Plant and Equipment (Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Balance at beginning of year $ 4,521  
Balance at end of year 4,663 $ 4,521
Depreciated balance at end of year 4,663 4,521
Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 9,810 9,158
Additions 589 490
Disposals (30) (63)
Translation differences (132) 269
Reclassification to assets held for sale, Property, Plant and Equipment   (44)
Balance at end of year 10,237 9,810
Depreciated balance at end of year 9,810 9,810
Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 5,289 4,849
Depreciation for the year 373 355
Disposals (27) (56)
Impairment 11 13
Translation differences (72) 147
Reclassification to assets held for sale, Property, Plant and Equipment   (19)
Balance at end of year 5,574 5,289
Depreciated balance at end of year 5,289 5,289
Land roads and buildings [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 393  
Balance at end of year 393 393
Depreciated balance at end of year 393 393
Land roads and buildings [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 844 763
Additions 42 42
Disposals (2) (6)
Translation differences (23) 49
Reclassification to assets held for sale, Property, Plant and Equipment   (4)
Balance at end of year 861 844
Depreciated balance at end of year 844 844
Land roads and buildings [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 451 409
Depreciation for the year 24 23
Disposals (1) (4)
Impairment 5 0
Translation differences (11) 24
Reclassification to assets held for sale, Property, Plant and Equipment   (1)
Balance at end of year 468 451
Depreciated balance at end of year 451 451
Installations and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 2,268  
Balance at end of year 2,789 2,268
Depreciated balance at end of year 2,789 2,268
Installations and equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 5,788 5,408
Additions 789 302
Disposals (19) (28)
Translation differences (76) 136
Reclassification to assets held for sale, Property, Plant and Equipment   (30)
Balance at end of year 6,482 5,788
Depreciated balance at end of year 5,788 5,788
Installations and equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 3,520 3,232
Depreciation for the year 234 227
Disposals (16) (23)
Impairment 5 13
Translation differences (50) 85
Reclassification to assets held for sale, Property, Plant and Equipment   (14)
Balance at end of year 3,693 3,520
Depreciated balance at end of year 3,520 3,520
Dikes and evaporating ponds [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 835  
Balance at end of year 836 835
Depreciated balance at end of year 836 835
Dikes and evaporating ponds [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 1,888 1,715
Additions 100 140
Disposals 0 0
Translation differences (13) 33
Reclassification to assets held for sale, Property, Plant and Equipment   0
Balance at end of year 1,975 1,888
Depreciated balance at end of year 1,888 1,888
Dikes and evaporating ponds [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 1,053 944
Depreciation for the year 96 84
Disposals 0 0
Impairment 0 0
Translation differences (10) 25
Reclassification to assets held for sale, Property, Plant and Equipment   0
Balance at end of year 1,139 1,053
Depreciated balance at end of year 1,053 1,053
Heavy mechanical equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 66  
Balance at end of year 64 66
Depreciated balance at end of year 64 66
Heavy mechanical equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 150 149
Additions 5 7
Disposals (2) (12)
Translation differences 0 7
Reclassification to assets held for sale, Property, Plant and Equipment   (1)
Balance at end of year 153 150
Depreciated balance at end of year 150 150
Heavy mechanical equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 84 83
Depreciation for the year 7 7
Disposals (2) (12)
Impairment 0 0
Translation differences 0 7
Reclassification to assets held for sale, Property, Plant and Equipment   (1)
Balance at end of year 89 84
Depreciated balance at end of year 84 84
Furniture, vehicles and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 61  
Balance at end of year 66 61
Depreciated balance at end of year 66 61
Furniture, vehicles and equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 242 244
Additions 20 13
Disposals (7) (17)
Translation differences (4) 9
Reclassification to assets held for sale, Property, Plant and Equipment   (7)
Balance at end of year 251 242
Depreciated balance at end of year 242 242
Furniture, vehicles and equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 181 181
Depreciation for the year 12 14
Disposals (8) (17)
Impairment 1 0
Translation differences (1) 6
Reclassification to assets held for sale, Property, Plant and Equipment   (3)
Balance at end of year 185 181
Depreciated balance at end of year 181 181
Plants under construction and spare parts for installations [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year [1] 898  
Balance at end of year [1] 515 898
Depreciated balance at end of year [1] 515 898
Plants under construction and spare parts for installations [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year [1] 898 879
Additions [1] (367) (14)
Disposals [1] 0 0
Translation differences [1] (16) 35
Reclassification to assets held for sale, Property, Plant and Equipment [1]   (2)
Balance at end of year [1] 515 898
Depreciated balance at end of year [1] 898 898
Plants under construction and spare parts for installations [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year [1] 0 0
Depreciation for the year [1] 0 0
Disposals [1] 0 0
Impairment [1] 0 0
Translation differences [1] 0 0
Reclassification to assets held for sale, Property, Plant and Equipment [1]   0
Balance at end of year [1] 0 0
Depreciated balance at end of year [1] $ 0 $ 0
[1] The additions for the year are presented net of items the construction of which were completed and accordingly were recorded in other categories in the “property, plant and equipment” section.