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Equity (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Number of shares reserved for issuance under the Company's option plans 20    
Expenses from Equity Compensation Plans $ 16 $ 15 $ 15
Treasury Shares $ 258