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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Apr. 30, 2020
Debt Instrument [Line Items]          
Line of credit balance $ 12,674 $ 12,674      
Net unrealized gain or loss of foreign currency transactions on intercompany loan hedges   5 $ 5    
Investments 64 64   $ 63  
Equity securities without readily determinable fair value, amount 8 8   $ 8  
Royalty fee          
Debt Instrument [Line Items]          
Revenue   40 $ 32    
Assets held for sale | Assets In Argentina          
Debt Instrument [Line Items]          
Consideration $ 4 4      
Consideration, rights to operate period 2 years        
Assets held for sale $ 15 15      
Liabilities held for sale $ 6 6      
Loss on assets held for sale   $ 13      
Medium-term Notes          
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