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Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Long-Term Debt    
Other $ 55 $ 136
Total long-term debt 17,045 17,369
Current portion of long-term debt (1,832) (140)
Long-term debt, excluding current portion $ 15,213 17,229
Revolving credit facility    
Long-Term Debt    
Unused commitment fee 0.225%  
Revolving credit facility | One month LIBOR | Maximum    
Long-Term Debt    
Applicable margin 1.625%  
Revolving credit facility    
Long-Term Debt    
Weighted average interest rate 0.00%  
Revolving credit facility $ 0 600
Senior notes | Senior USD Notes    
Long-Term Debt    
Weighted average interest rate 3.80%  
Senior notes $ 4,938 4,938
Senior notes | Senior USD Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 3.00%  
Senior notes | Senior USD Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 5.00%  
Senior notes | Senior Euro Notes    
Long-Term Debt    
Weighted average interest rate 1.00%  
Senior notes $ 9,086 8,694
Senior notes | Senior Euro Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 0.10%  
Senior notes | Senior Euro Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 3.00%  
Senior notes | Senior GBP Notes    
Long-Term Debt    
Weighted average interest rate 2.70%  
Senior notes $ 2,380 2,440
Senior notes | Senior GBP Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 1.70%  
Senior notes | Senior GBP Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 3.40%  
Senior notes | Senior Euro Floating Rate Notes    
Long-Term Debt    
Weighted average interest rate 0.00%  
Senior notes $ 586 $ 561