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Credit from Banks and Others (Movement during the year in Credit from Banks and Others) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Balance at the begining of the year $ 3,399    
Receipt of long-term debt 276    
Repayment of long-term debt (379)    
Credit facilities used, net (318)    
Receipt of short-term credit net of repayment 147 $ 14 $ 8
Interest paid (111) (112) $ (87)
Effect of changes in foreign exchange rates 101    
Other changes 112    
Balance at the end of the year $ 3,227 $ 3,399