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Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Debt

Debt consists of (in millions):

 

     December 31,  
     2017      2016  

$500 million in Senior Notes, interest at 1.35% payable semiannually, principal due on December 1, 2017

     —          499  

$1.4 billion in Senior Notes, interest at 2.60% payable semiannually, principal due on December 1, 2022

     1,392        1,391  

$1.1 billion in Senior Notes, interest at 3.95% payable semiannually, principal due on December 1, 2042

     1,088        1,087  

Capital Leases and other debt

     232        237  
  

 

 

    

 

 

 

Total debt

     2,712        3,214  

Less current portion

     6        506  
  

 

 

    

 

 

 

Long-term debt

   $ 2,706      $ 2,708  
  

 

 

    

 

 

 
Principal Payments of Debt and Capital Leases

Principal payments of debt and capital leases for years subsequent to 2017 are as follows (in millions):

 

2018

   $ 6  

2019

     5  

2020

     5  

2021

     5  

2022

     1,405  

Thereafter

     1,286  
  

 

 

 
   $ 2,712