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Derivative Financial Instruments (Balance Sheet Location of Derivative Instruments) (Details) - Derivatives designated as hedging instruments - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Other current assets    
Derivatives, Fair Value    
Assets $ 6 $ 0
Other non-current assets    
Derivatives, Fair Value    
Assets 29 4
Other current liabilities    
Derivatives, Fair Value    
Liabilities (9) 0
Other non-current accrued liabilities    
Derivatives, Fair Value    
Liabilities $ (2) $ (24)