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Credit from Banks and Others (Sale of Receivables under Securitization Transaction) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Value of the transferred assets $ 331 $ 331 $ 285
Fair value of the associated liabilities 331 331 285
Net Position [1] $ 0 $ 0 $ 0
[1] Less than $1 million.