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Debt (Schedule of Outstanding Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jul. 25, 2017
Debt Instrument      
Other $ 136 $ 34  
Total principal payments 17,369 8,718  
Current portion of long-term debt (140) (48)  
Long-term debt, excluding current portion $ 17,229 8,670  
Revolving Credit Facility      
Debt Instrument      
Weighted average interest rate (percent) 2.80%    
Credit facility outstanding amount $ 600 208  
Revolving loan unused commitment fee (percent) 0.225%    
Revolving Credit Facility | LIBOR | Maximum      
Debt Instrument      
Applicable margin (percent) 1.625%    
Senior Notes      
Debt Instrument      
Weighted average interest rate (percent)     4.00%
Senior Notes | Senior USD Notes      
Debt Instrument      
Weighted average interest rate (percent) 3.83%    
Senior notes $ 4,938 6,950  
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) 1.06%    
Senior notes $ 8,694 1,144  
Senior Notes | Senior Euro Notes | Minimum      
Debt Instrument      
Debt instrument, stated percentage (percent) 0.13%    
Senior Notes | Senior Euro Notes | Maximum      
Debt Instrument      
Debt instrument, stated percentage (percent) 2.95%    
Senior Notes | Senior GBP Notes      
Debt Instrument      
Weighted average interest rate (percent) 2.65%    
Senior notes $ 2,440 382  
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) 3.36%    
Senior Notes | Senior Euro Floating Rate Notes      
Debt Instrument      
Weighted average interest rate (percent) 0.00%    
Senior notes $ 561 $ 0