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Debt (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Debt
A summary of short-term and long-term debt outstanding is as follows:
(in millions)
March 31,
2018
 
December 31,
2017
2.5% Senior Notes, due 2018 1
$
400

 
$
399

3.3% Senior Notes, due 2020 2
697

 
697

4.0% Senior Notes, due 2025 3
692

 
692

4.4% Senior Notes, due 2026 4
892

 
892

2.95% Senior Notes, due 2027 5
493

 
493

6.55% Senior Notes, due 2037 6
396

 
396

Total debt
3,570

 
3,569

Less: short-term debt including current maturities
400

 
399

Long-term debt
$
3,170

 
$
3,170


1 
Interest payments are due semiannually on February 15 and August 15, and as of March 31, 2018, the unamortized debt discount and issuance costs are less than $1 million.
2 
Interest payments are due semiannually on February 14 and August 14, and as of March 31, 2018, 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 March 31, 2018, 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 March 31, 2018, 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 March 31, 2018, the unamortized debt discount and issuance costs total $7 million.
6 
Interest payments are due semiannually on May 15 and November 15, and as of March 31, 2018, the unamortized debt discount and issuance costs total $4 million.