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Equity (Composition) (Details) - shares
shares in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Ordinary shares of Israeli Shekel 1 par value (in millions) [Member]      
Disclosure of classes of share capital [Line Items]      
Number of shares authorized 1,485 1,485  
Number of shares issued and paid 1,303 1,301 1,300
Number of Special State share of Israeli Shekel 1 par value [Member]      
Disclosure of classes of share capital [Line Items]      
Number of shares authorized 1 1  
Number of shares issued and paid 1 1