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Operating Segments (Non Current Assets by Geographical Location of the Assets) (Details) - Assets [Domain] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [Line Items]    
Non-current assets $ 5,484 $ 5,490
Israel [Member]    
Disclosure of geographical areas [Line Items]    
Non-current assets 3,387 3,351
Europe [Member]    
Disclosure of geographical areas [Line Items]    
Non-current assets 1,227 1,127
Asia [Member]    
Disclosure of geographical areas [Line Items]    
Non-current assets 455 472
North America [Member]    
Disclosure of geographical areas [Line Items]    
Non-current assets 321 382
Others [Member]    
Disclosure of geographical areas [Line Items]    
Non-current assets $ 94 $ 158