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Operating Segments (Operating Income-Loss 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]      
Operating income (loss) $ 629 $ (3) $ 765
Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) 629 (3) 765
Israel [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) 475 304 386
Europe [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) (45) (117) 254
North America [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) 154 83 89
Others [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) 21 (242) 23
Intercompany eliminations [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) 4 (29) (8)
South America [Member] | Assets [Domain]      
Disclosure of geographical areas [Line Items]      
Operating income (loss) $ 20 $ (2) $ 21