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Details of Income Statement Items (Sales) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]      
Sales $ 5,043 $ 5,271 $ 5,556
Cost of sales [Abstract]      
Materials consumed 1,647 1,702 1,643
Cost of labor 794 766 791
Depreciation and amortization 416 384 384
Energy and fuel 316 340 349
Other [1] 380 262 535
Cost of sales $ 3,553 $ 3,454 $ 3,702
[1] The amount in 2020 includes a write-off of inventory, mainly inventory in-process unlikely to be realized, in the amount of $55 million following the discontinuation of the unprofitable production and sale of the phosphate rock activity in Rotem Israel.