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Debt (Schedule of Outstanding Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jun. 15, 2018
May 16, 2018
Dec. 31, 2017
Jul. 25, 2017
Jul. 10, 2017
Oct. 13, 2015
Debt Instrument              
Senior notes             $ 4,500
Other $ 34     $ 15      
Total principal payments 8,718     8,763      
Current portion of long-term debt (48)     (1,045)      
Long-term debt, excluding current portion 8,670     7,718      
Revolving Credit Facility              
Debt Instrument              
Credit facility outstanding amount $ 208     195      
Revolving loan unused commitment fee percentage 0.225%            
Weighted average interest rate (percent) 3.65%            
Revolving Credit Facility | LIBOR | Maximum              
Debt Instrument              
Applicable margin 1.625%            
Senior Notes              
Debt Instrument              
Weighted average interest rate (percent)         4.00%    
Senior Notes | Senior Notes due April 2018, interest payable semi-annually at 2.000%              
Debt Instrument              
Debt instrument, stated percentage 2.00%            
Senior notes $ 0     250      
Senior Notes | Senior Notes due October 2018, interest payable semi-annually at 2.850%              
Debt Instrument              
Debt instrument, stated percentage 2.85% 2.85%          
Senior notes $ 0     750      
Senior Notes | Senior Notes due October 2020, interest payable semi-annually at 3.625% (2020 Notes)              
Debt Instrument              
Debt instrument, stated percentage 3.625%       3.625%    
Senior notes $ 1,150     1,150      
Senior Notes | Senior Euro Notes due January 2021, interest payable annually at 0.400% (2021 Euro Notes)              
Debt Instrument              
Debt instrument, stated percentage 0.40%         0.40%  
Senior notes $ 572     599      
Senior Notes | Senior Notes due August 2021, interest payable semi-annually at 2.250% (2021 Notes)              
Debt Instrument              
Debt instrument, stated percentage 2.25%            
Senior notes $ 750     750      
Senior Notes | Senior GBP Notes due June 2022, interest payable annually at 1.700% (2022 GBP Notes)              
Debt Instrument              
Debt instrument, stated percentage 1.70%         1.70%  
Senior notes $ 382     405      
Senior Notes | Senior Notes due October 2022, interest payable semi-annually at 4.500% (2022 Notes)              
Debt Instrument              
Debt instrument, stated percentage 4.50%       4.50%    
Senior notes $ 300     300      
Senior Notes | Senior Notes due April 2023, interest payable semi-annually at 3.500% (2023 Notes)              
Debt Instrument              
Debt instrument, stated percentage 3.50%       3.50%    
Senior notes $ 700     700      
Senior Notes | Senior Notes due June 2024, interest payable semi-annually at 3.875% (2024 Notes)              
Debt Instrument              
Debt instrument, stated percentage 3.875%       3.875%    
Senior notes $ 400     400      
Senior Notes | Senior Euro Notes due July 2024, interest payable annually at 1.100% (2024 Euro Notes)              
Debt Instrument              
Debt instrument, stated percentage 1.10%         1.10%  
Senior notes $ 572     599      
Senior Notes | Senior Notes due October 2025, interest payable semi-annually at 5.000% (2025 Notes)              
Debt Instrument              
Debt instrument, stated percentage 5.00%       5.00%    
Senior notes $ 900     900      
Senior Notes | Senior Notes due August 2026, interest payable semi-annually at 3.000% (2026 Notes)              
Debt Instrument              
Debt instrument, stated percentage 3.00%            
Senior notes $ 1,250     1,250      
Senior Notes | Senior Notes due May 2028, interest payable semi-annually at 4.250% (2028 Notes)              
Debt Instrument              
Debt instrument, stated percentage 4.25%   4.25%        
Senior notes $ 400     0      
Senior Notes | Senior Notes due August 2046, interest payable semi-annually at 4.500% (2046 Notes)              
Debt Instrument              
Debt instrument, stated percentage 4.50%            
Senior notes $ 500     500      
Senior Notes | Senior Notes due May 2048, interest payable semi-annually at 4.750% (2048 Notes)              
Debt Instrument              
Debt instrument, stated percentage 4.75%   4.75%        
Senior notes $ 600     $ 0