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Equity (Reconciliation of the Number of Shares Outstanding) (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of Ordinary shares of Israeli Shekel 1 par value (in millions) [Member]    
Disclosure of classes of share capital [Line Items]    
Balance as at Start of Period 1,301 1,300
Issuance of shares 2 1
Balance as at End of Period 1,303 1,301
Number of Special State share of Israeli Shekel 1 par value [Member]    
Disclosure of classes of share capital [Line Items]    
Balance as at Start of Period 1  
Balance as at End of Period 1 1