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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]      
Balance at the begining of the year $ 2,559 $ 2,442  
Receipt of long-term debt 1,175 657 $ 1,746
Repayments of long-term debt (1,133) (689) (2,115)
Repayment of short-term debit, net (52) (183) (283)
Interest paid 109 115 103
Receipt from transactions in derivatives designated as a cash flow hedge 24 0 0
Initial recognition of lease liability 80 353  
Interest expenses 120 125 117
Effect of changes in foreign exchange rates 84 48  
Change in fair value of cash flow hedges (53) (42) 0
Other changes (35) (37)  
Balance at the end of the year $ 2,660 $ 2,559 $ 2,442