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Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt    
Other $ 82 $ 136
Long-term Debt 19,634 17,369
Current portion of long-term debt (652) (140)
Long-term debt, excluding current portion $ 18,982 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    
Revolving credit facility $ 3,250 600
Weighted average interest rate 2.00%  
Senior notes | Fixed Rate Senior USD Notes    
Long-Term Debt    
Senior notes $ 4,938 4,938
Weighted average interest rate 3.80%  
Senior notes | Fixed Rate Senior USD Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 3.00%  
Senior notes | Fixed Rate Senior USD Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 5.00%  
Senior notes | Fixed Rate Senior Euro Notes    
Long-Term Debt    
Senior notes $ 8,526 8,694
Weighted average interest rate 1.10%  
Senior notes | Fixed Rate Senior Euro Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 0.10%  
Senior notes | Fixed Rate Senior Euro Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 3.00%  
Senior notes | Fixed Rate Senior GBP Notes    
Long-Term Debt    
Senior notes $ 2,288 2,440
Weighted average interest rate 2.70%  
Senior notes | Fixed Rate Senior GBP Notes | Minimum    
Long-Term Debt    
Debt instrument, stated percentage 1.70%  
Senior notes | Fixed Rate Senior GBP Notes | Maximum    
Long-Term Debt    
Debt instrument, stated percentage 3.40%  
Senior notes | Senior Euro Floating Rates Notes    
Long-Term Debt    
Senior notes $ 550 $ 561
Weighted average interest rate 0.00%