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Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Long-Term Debt    
Other $ (132) $ 46
Total long-term debt 16,902 17,265
Current portion of long-term debt (602) (1,314)
Long-term debt, excluding current portion $ 16,300 15,951
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 $ 0 251
Senior notes | Senior USD Notes    
Long-Term Debt    
Weighted average interest rate 1.90%  
Senior notes $ 6,909 4,938
Senior notes | Senior USD Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 0.40%  
Senior notes | Senior USD Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 4.80%  
Senior notes | Senior Euro Notes    
Long-Term Debt    
Weighted average interest rate 1.30%  
Senior notes $ 7,916 8,891
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 1.50%  
Senior notes $ 1,686 2,526
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 $ 523 $ 613