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Financial Instruments (Fair Value of Interest Rate Swaps) (Details) - Interest Rate Swap [Member] - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts $ 0 $ 1
Accounts Payable and Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts 0 0
Other Long-term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts $ 0 $ 1