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Credit from Banks and Others (Yearly movement in Credit from Banks and Others) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]      
Balance at the begining of the year $ 3,227 $ 3,399  
Receipt of long-term debt 1,746 966 $ 1,278
Repayment of long-term debt (2,115) (1,387) (1,365)
Repayment of short-term credit, net of receipt (283) 147 14
Interest paid (103) (111) (112)
Effect of changes in foreign exchange rates (63) 101  
Other changes 33 112  
Balance at the end of the year $ 2,442 $ 3,227 $ 3,399