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Long-Term Debt (Schedule of Long Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 13, 2015
Debt Instrument [Line Items]      
Senior notes     $ 4,500
Other $ 15 $ (58)  
Total principal payments 8,763 10,478  
Current portion (1,045) (332)  
Long-term debt, excluding current portion 7,718 10,146  
2018 Term Loans [Member]      
Debt Instrument [Line Items]      
Term loans $ 0 $ 550  
Applicable margin 1.75%    
Senior Notes due June 2017, interest payable semi-annually at 1.450% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage   1.45%  
Senior notes $ 0 $ 300  
Senior Notes due April 2018, interest payable semi-annually at 2.000% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 2.00%    
Senior notes $ 250 250  
Senior Notes due October 2018, interest payable semi-annually at 2.850% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 2.85%    
Senior notes $ 750 750  
Senior Notes due October 2020, interest payable semi-annually at 3.625% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 3.625%    
Senior notes $ 1,150 1,750  
Senior Euro Notes due 2021, interest payable annually at 0.400% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 0.40%    
Senior notes $ 599 0  
Senior Notes due 2021, interest payable semi-annually at 2.250% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 2.25%    
Senior notes $ 750 $ 750  
Senior Notes due March 2022, interest payable semi-annually at 5.000% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage   5.00%  
Senior notes $ 0 $ 700  
Senior GBP Notes due 2022, interest payable annually at 1.700% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 1.70%    
Senior notes $ 405 0  
Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 4.50%    
Senior notes $ 300 500  
Senior Notes due 2023, interest payable semi-annually at 3.500% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 3.50%    
Senior notes $ 700 1,000  
Senior Notes due 2024, interest payable semi-annually at 3.875% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 3.875%    
Senior notes $ 400 700  
Senior Euro Notes due 2024, interest payable annually at 1.100% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 1.10%    
Senior notes $ 599 0  
Senior Notes due October 2025, interest payable semi-annually at 5.000% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 5.00%    
Senior notes $ 900 1,500  
Senior Notes due 2026, interest payable semi-annually at 3.000% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 3.00%    
Senior notes $ 1,250 1,250  
Senior Notes due 2046, interest payable semi-annually at 4.500% [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated percentage 4.50%    
Senior notes $ 500 500  
Revolving Loan [Member]      
Debt Instrument [Line Items]      
Term loans $ 195 $ 36  
Applicable margin 1.75%    
Revolving loan unused commitment fee percentage 0.25%    
Revolving loan marginal rates 2.64%