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Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Long-Term Debt    
Other $ 75 $ 136
Long-term Debt 16,651 17,369
Current portion of long-term debt (1,777) (140)
Long-term debt, excluding current portion $ 14,874 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 1.30%  
Revolving credit facility $ 95 600
Senior notes | Fixed Rate Senior USD Notes    
Long-Term Debt    
Weighted average interest rate 3.80%  
Senior notes $ 4,938 4,938
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    
Weighted average interest rate 1.10%  
Senior notes $ 8,702 8,694
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    
Weighted average interest rate 2.70%  
Senior notes $ 2,280 2,440
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    
Weighted average interest rate 0.10%  
Senior notes $ 561 $ 561