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Debt (Tables)
9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of debt
(in millions)
September 30,
2017
 
December 31,
2016
2.5% Senior Notes, due 2018 1
$
399

 
$
398

3.3% Senior Notes, due 2020 2
697

 
696

4.0% Senior Notes, due 2025 3
692

 
691

4.4% Senior Notes, due 2026 4
892

 
891

2.95% Senior Notes, due 2027 5
492

 
492

6.55% Senior Notes, due 2037 6
396

 
396

Total debt
3,568

 
3,564

Less: short-term debt including current maturities

 

Long-term debt
$
3,568

 
$
3,564


1 
Interest payments are due semiannually on February 15 and August 15, and as of September 30, 2017, the unamortized debt discount and issuance costs total $1 million.
2 
Interest payments are due semiannually on February 14 and August 14, and as of September 30, 2017, the unamortized debt discount and issuance costs total $3 million.
3 
Interest payments are due semiannually on June 15 and December 15, and as of September 30, 2017, the unamortized debt discount and issuance costs total $8 million.
4 
Interest payments are due semiannually on February 15 and August 15, and as of September 30, 2017, the unamortized debt discount and issuance costs total $8 million.
5 
Interest payments are due semiannually on January 22 and July 22, and as of September 30, 2017, the unamortized debt discount and issuance costs total $8 million.
6 
Interest payments are due semiannually on May 15 and November 15, and as of September 30, 2017, the unamortized debt discount and issuance costs total $4 million.