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Property Plant and Equipment (Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Balance at beginning of year $ 4,663    
IFRS 16 initial implementation 339    
Reversal of impairment 10 $ 0 $ 0
Balance at end of year 5,331 4,663  
Depreciated balance at end of year 4,663 4,663  
Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 10,237 9,810  
IFRS 16 initial implementation 300    
Reclassification of finance lease [1] 96    
Additions 714 589  
Disposals (132) (30)  
Translation differences (21) (132)  
Balance at end of year 11,194 10,237 9,810
Depreciated balance at end of year 11,194 10,237 9,810
Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 5,574 5,289  
Depreciation for the year 415 373  
Impairment   11  
Disposals (102) (27)  
Reversal of impairment (10)    
Translation differences (14) (72)  
Balance at end of year 5,863 5,574 5,289
Depreciated balance at end of year 5,863 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 359 393  
Depreciated balance at end of year 359 393  
Land roads and buildings [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 861 844  
IFRS 16 initial implementation 0    
Reclassification of finance lease [1] 0    
Additions 17 42  
Disposals (69) (2)  
Translation differences (5) (23)  
Balance at end of year 804 861 844
Depreciated balance at end of year 804 861 844
Land roads and buildings [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 468 451  
Depreciation for the year 36 24  
Impairment   5  
Disposals (45) (1)  
Reversal of impairment (10)    
Translation differences (4) (11)  
Balance at end of year 445 468 451
Depreciated balance at end of year 445 451 451
Installations and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 2,789    
Balance at end of year 2,846 2,789  
Depreciated balance at end of year 2,846 2,789  
Installations and equipment [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 6,482 5,788  
IFRS 16 initial implementation 0    
Reclassification of finance lease [1] 0    
Additions 268 789  
Disposals (37) (19)  
Translation differences (6) (76)  
Balance at end of year 6,707 6,482 5,788
Depreciated balance at end of year 6,707 6,482 5,788
Installations and equipment [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 3,693 3,520  
Depreciation for the year 210 234  
Impairment   5  
Disposals (36) (16)  
Reversal of impairment 0    
Translation differences (6) (50)  
Balance at end of year 3,861 3,693 3,520
Depreciated balance at end of year 3,861 3,520 3,520
Dikes and evaporating ponds [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 836    
Balance at end of year 811 836  
Depreciated balance at end of year 811 836  
Dikes and evaporating ponds [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 1,975 1,888  
IFRS 16 initial implementation 0    
Reclassification of finance lease [1] 0    
Additions 65 100  
Disposals 0 0  
Translation differences (5) (13)  
Balance at end of year 2,035 1,975 1,888
Depreciated balance at end of year 2,035 1,975 1,888
Dikes and evaporating ponds [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 1,139 1,053  
Depreciation for the year 89 96  
Impairment   0  
Disposals 0 0  
Reversal of impairment 0    
Translation differences (4) (10)  
Balance at end of year 1,224 1,139 1,053
Depreciated balance at end of year 1,224 1,053 1,053
Heavy mechanical equipment [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 64    
Balance at end of year 69 64  
Depreciated balance at end of year 69 64  
Heavy mechanical equipment [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 153 150  
IFRS 16 initial implementation 0    
Reclassification of finance lease [1] 0    
Additions 15 5  
Disposals (10) (2)  
Translation differences 0 0  
Balance at end of year 158 153 150
Depreciated balance at end of year 158 153 150
Heavy mechanical equipment [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 89 84  
Depreciation for the year 8 7  
Impairment   0  
Disposals (8) (2)  
Reversal of impairment 0    
Translation differences 0 0  
Balance at end of year 89 89 84
Depreciated balance at end of year 89 84 84
Furniture, vehicles and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 66    
Balance at end of year 68 66  
Depreciated balance at end of year 68 66  
Furniture, vehicles and equipment [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 251 242  
IFRS 16 initial implementation 0    
Reclassification of finance lease [1] 0    
Additions 25 20  
Disposals (5) (7)  
Translation differences (1) (4)  
Balance at end of year 270 251 242
Depreciated balance at end of year 270 251 242
Furniture, vehicles and equipment [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 185 181  
Depreciation for the year 21 12  
Impairment   1  
Disposals (4) (8)  
Reversal of impairment 0    
Translation differences 0 (1)  
Balance at end of year 202 185 181
Depreciated balance at end of year 202 181 181
Right of use asset [Member]      
Property, Plant and Equipment [Line Items]      
Balance at end of year 381    
Depreciated balance at end of year 381    
Right of use asset [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 0    
IFRS 16 initial implementation 300    
Reclassification of finance lease [1] 96    
Additions 39    
Disposals (11)    
Translation differences (1)    
Balance at end of year 423 0  
Depreciated balance at end of year 423 0  
Right of use asset [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 0    
Depreciation for the year 51    
Disposals (9)    
Reversal of impairment 0    
Translation differences 0    
Balance at end of year 42 0  
Depreciated balance at end of year 42 0  
Plants under construction and spare parts for installations [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 515    
Balance at end of year [2] 797 515  
Depreciated balance at end of year [2] 797 515  
Plants under construction and spare parts for installations [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 515 898  
IFRS 16 initial implementation [2] 0    
Reclassification of finance lease [1],[2] 0    
Additions 285 (367)  
Disposals [2] 0 0  
Translation differences [2] (3) (16)  
Balance at end of year [2] 797 515 898
Depreciated balance at end of year [2] 797 515 898
Plants under construction and spare parts for installations [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 0 0  
Depreciation for the year [2] 0 0  
Impairment [2]   0  
Disposals [2] 0 0  
Reversal of impairment [2] 0    
Translation differences [2] 0 0  
Balance at end of year [2] 0 0 0
Depreciated balance at end of year [2] $ 0 $ 0 $ 0
[1] Reclassification of finance leases (as defined in IAS 17) from non-current asset to property, plant and equipment.
[2] The additions are presented net of items for which construction has been completed and accordingly were reclassified to other categories in the “property, plant and equipment” section.