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Equity (Narratives) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]      
Number of shares reserved for issuance under the Company's option plans 18    
Expenses from Equity Compensation Plans $ 19 $ 16 $ 15
Total shares held by the company and it's subsidiaries 24.5