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Employee Benefits (Narratives) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
yr
Dec. 31, 2016
USD ($)
yr
Dec. 31, 2015
USD ($)
Notes to Consolidated Financial Statements [Abstract]      
Provision for employee severance benefits relating to Rotem Amfert Israel $ 15    
Actual return (loss) on plan assets 42 $ 47 $ (1)
Expenses recorded in respect of defined benefit plans $ 40 $ 32 $ 23
Life of defined benefit plans | yr 16.3 15.3