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Debt (Schedule of Outstanding Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument    
Other $ 46 $ 136
Total long-term debt, including current portion 17,265 17,369
Current portion of long-term debt (1,314) (140)
Long-term debt, excluding current portion $ 15,951 17,229
Revolving Credit Facility    
Debt Instrument    
Weighted average interest rate (percent) 1.30%  
Credit facility outstanding amount $ 251 600
Revolving loan unused commitment fee (percent) 0.225%  
Revolving Credit Facility | LIBOR | Maximum    
Debt Instrument    
Applicable margin (percent) 1.625%  
Senior Notes | Senior USD Notes    
Debt Instrument    
Weighted average interest rate (percent) 3.70%  
Senior notes $ 4,938 4,938
Senior Notes | Senior USD Notes | Minimum    
Debt Instrument    
Debt instrument, stated percentage (percent) 3.00%  
Senior Notes | Senior USD Notes | Maximum    
Debt Instrument    
Debt instrument, stated percentage (percent) 5.00%  
Senior Notes | Senior Euro Notes    
Debt Instrument    
Weighted average interest rate (percent) 1.10%  
Senior notes $ 8,891 8,694
Senior Notes | Senior Euro Notes | Minimum    
Debt Instrument    
Debt instrument, stated percentage (percent) 0.10%  
Senior Notes | Senior Euro Notes | Maximum    
Debt Instrument    
Debt instrument, stated percentage (percent) 3.00%  
Senior Notes | Senior GBP Notes    
Debt Instrument    
Weighted average interest rate (percent) 2.70%  
Senior notes $ 2,526 2,440
Senior Notes | Senior GBP Notes | Minimum    
Debt Instrument    
Debt instrument, stated percentage (percent) 1.70%  
Senior Notes | Senior GBP Notes | Maximum    
Debt Instrument    
Debt instrument, stated percentage (percent) 3.40%  
Senior Notes | Senior Euro Floating Rate Notes    
Debt Instrument    
Weighted average interest rate (percent) 0.00%  
Senior notes $ 613 $ 561