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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jul. 30, 2021
Dec. 31, 2020
Apr. 30, 2020
Debt Instrument [Line Items]                
Line of credit balance   $ 13,896   $ 13,896        
Immaterial amount and a (loss)       6 $ 6      
Investments   66   66     $ 63  
Equity method investment   2 $ 1 2 1      
Equity securities without readily determinable fair value, amount   8   8     $ 8  
Royalty fee                
Debt Instrument [Line Items]                
Revenue   $ 19 $ 22 59 $ 54      
Disposed of by Sale                
Debt Instrument [Line Items]                
Amount of consideration received $ 4              
Disposed of by Sale | Assets In Argentina                
Debt Instrument [Line Items]                
Consideration, rights to operate period 2 years              
Loss on sale       14        
Severance costs       $ 1        
Term loan                
Debt Instrument [Line Items]                
Long-term debt               $ 1,200
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit balance               $ 1,800
Line of Credit | Revolving Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Line of credit balance           $ 1,950