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Information by business segment and by geographic area - Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Information by business segment and by geographic area      
Product inventory $ 3,487 $ 2,867  
Investments in associates and joint ventures 3,225 3,568 $ 3,696
Property, plant and equipment and intangible 56,347 63,371  
Capital expenditures - Sustaining capital 2,896 2,231 2,088
Capital expenditures - Project execution 888 1,600 2,863
Depreciation, depletion and amortization 3,351 3,708 3,487
Ferrous minerals      
Information by business segment and by geographic area      
Product inventory 2,210 1,770  
Investments in associates and joint ventures 1,814 1,922  
Property, plant and equipment and intangible 31,377 36,103  
Capital expenditures - Sustaining capital 1,569 1,194 891
Capital expenditures - Project execution 823 1,485 2,355
Depreciation, depletion and amortization 1,672 1,709 1,533
Ferrous minerals | Iron ore      
Information by business segment and by geographic area      
Goodwill 1,841 2,157  
Coal      
Information by business segment and by geographic area      
Product inventory 119 82  
Investments in associates and joint ventures 317 317  
Property, plant and equipment and intangible 1,589 1,719  
Capital expenditures - Sustaining capital 132 73 149
Capital expenditures - Project execution 24 45 463
Depreciation, depletion and amortization 252 296 185
Base metals      
Information by business segment and by geographic area      
Product inventory 1,147 1,009  
Investments in associates and joint ventures 14 13  
Property, plant and equipment and intangible 21,295 23,603  
Capital expenditures - Sustaining capital 1,189 960 1,045
Capital expenditures - Project execution 34 50 12
Depreciation, depletion and amortization 1,351 1,590 1,636
Base metals | Nickel and other products      
Information by business segment and by geographic area      
Goodwill 1,812 1,953  
Others      
Information by business segment and by geographic area      
Product inventory 11 6  
Investments in associates and joint ventures 1,080 1,316  
Property, plant and equipment and intangible 2,086 1,946  
Capital expenditures - Sustaining capital 6 4 3
Capital expenditures - Project execution 7 20 33
Depreciation, depletion and amortization $ 76 $ 113 $ 133