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Derivative Financial Instruments (Balance Sheet Location of Derivative Instruments) (Details) - Derivatives designated as hedging instruments - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Other current assets    
Derivatives, Fair Value    
Assets $ 0 $ 3
Other non-current assets    
Derivatives, Fair Value    
Assets 7 0
Other current liabilities    
Derivatives, Fair Value    
Liabilities (5) (1)
Other non-current accrued liabilities    
Derivatives, Fair Value    
Liabilities $ (19) $ (46)