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Operating Segments (Sales by Geographical Location of the Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of geographical areas [Line Items]      
Sales $ 5,418 $ 5,363 $ 5,405
Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 5,418 5,363 5,405
Israel [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 2,548 2,470 2,427
Europe [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 2,119 2,124 2,296
North America [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 1,045 1,045 1,148
Others [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 798 774 503
Subtotal [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales 6,510 6,413 6,374
Intercompany sales [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Sales $ (1,092) $ (1,050) $ (969)