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Derivative Financial Instruments (Balance Sheet Location of Derivative Instruments) (Details) - Derivatives designated as hedging instruments - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Other non-current accrued liabilities    
Derivatives, Fair Value    
Liabilities $ (82) $ (117)
Other current liabilities    
Derivatives, Fair Value    
Liabilities $ (5) $ 0