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Property Plant and Equipment (Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Balance at beginning of year $ 4,309  
Balance at end of year 4,521 $ 4,309
Depreciated balance at end of year 4,521 4,309
Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 9,158 8,800
Additions 490 539
Disposals (63) (73)
Translation differences 269 (113)
Reclassification from assets held for sale, Property, Plant and Equipment (44) 5
Balance at end of year 9,810 9,158
Depreciated balance at end of year 9,158 9,158
Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 4,849 4,588
Depreciation for the year 355 365
Disposals (56) (60)
Impairment 13 5
Translation differences 147 (49)
Reclassification from assets held for sale, Property, Plant and Equipment (19)  
Balance at end of year 5,289 4,849
Depreciated balance at end of year 4,849 4,849
Land roads and buildings [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 354  
Balance at end of year 393 354
Depreciated balance at end of year 393 354
Land roads and buildings [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 763 760
Additions 42 24
Disposals (6) (4)
Translation differences 49 (17)
Reclassification from assets held for sale, Property, Plant and Equipment (4) 0
Balance at end of year 844 763
Depreciated balance at end of year 763 763
Land roads and buildings [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 409 396
Depreciation for the year 23 22
Disposals (4) (2)
Impairment 0 0
Translation differences 24 (7)
Reclassification from assets held for sale, Property, Plant and Equipment (1)  
Balance at end of year 451 409
Depreciated balance at end of year 409 409
Installations and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 2,176  
Balance at end of year 2,268 2,176
Depreciated balance at end of year 2,268 2,176
Installations and equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 5,408 5,038
Additions 302 488
Disposals (28) (49)
Translation differences 136 (72)
Reclassification from assets held for sale, Property, Plant and Equipment (30) 3
Balance at end of year 5,788 5,408
Depreciated balance at end of year 5,408 5,408
Installations and equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 3,232 3,085
Depreciation for the year 227 218
Disposals (23) (41)
Impairment 13 5
Translation differences 85 (35)
Reclassification from assets held for sale, Property, Plant and Equipment (14)  
Balance at end of year 3,520 3,232
Depreciated balance at end of year 3,232 3,232
Dikes and evaporating ponds [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 771  
Balance at end of year 835 771
Depreciated balance at end of year 835 771
Dikes and evaporating ponds [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 1,715 1,634
Additions 140 89
Disposals 0 0
Translation differences 33 (8)
Reclassification from assets held for sale, Property, Plant and Equipment 0 0
Balance at end of year 1,888 1,715
Depreciated balance at end of year 1,715 1,715
Dikes and evaporating ponds [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 944 848
Depreciation for the year 84 102
Disposals 0 0
Impairment 0 0
Translation differences 25 (6)
Reclassification from assets held for sale, Property, Plant and Equipment 0  
Balance at end of year 1,053 944
Depreciated balance at end of year 944 944
Heavy mechanical equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 66  
Balance at end of year 66 66
Depreciated balance at end of year 66 66
Heavy mechanical equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 149 157
Additions 7 2
Disposals (12) (10)
Translation differences 7 0
Reclassification from assets held for sale, Property, Plant and Equipment (1) 0
Balance at end of year 150 149
Depreciated balance at end of year 149 149
Heavy mechanical equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 83 84
Depreciation for the year 7 8
Disposals (12) (9)
Impairment 0 0
Translation differences 7 0
Reclassification from assets held for sale, Property, Plant and Equipment (1)  
Balance at end of year 84 83
Depreciated balance at end of year 83 83
Furniture, vehicles and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 63  
Balance at end of year 61 63
Depreciated balance at end of year 61 63
Furniture, vehicles and equipment [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 244 235
Additions 13 19
Disposals (17) (10)
Translation differences 9 (2)
Reclassification from assets held for sale, Property, Plant and Equipment (7) 2
Balance at end of year 242 244
Depreciated balance at end of year 244 244
Furniture, vehicles and equipment [Member] | Accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year 181 175
Depreciation for the year 14 15
Disposals (17) (8)
Impairment 0 0
Translation differences 6 (1)
Reclassification from assets held for sale, Property, Plant and Equipment (3)  
Balance at end of year 181 181
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] 879  
Balance at end of year [1] 898 879
Depreciated balance at end of year [1] 898 879
Plants under construction and spare parts for installations [Member] | Gross [Member]    
Property, Plant and Equipment [Line Items]    
Balance at beginning of year [1] 879 976
Additions [1] (14) (83)
Disposals [1] 0 0
Translation differences [1] 35 (14)
Reclassification from assets held for sale, Property, Plant and Equipment [1] (2) 0
Balance at end of year [1] 898 879
Depreciated balance at end of year [1] 879 879
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 from 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.