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Debt (Tables)
12 Months Ended
Dec. 31, 2016
Debt Instrument [Line Items]  
Debt
At December 31, our debt consisted of the following: 
 
 
2016
 
2015
 
 
(In millions)
Senior unsecured debt:
 
 
 
 
Revolving credit facility — LIBOR based loans (matures in June 2020)
 
$

 
$

Money market lines of credit
 

 
39

Total credit arrangements
 

 
39

5¾% Senior Notes due 2022
 
750

 
750

5⅝% Senior Notes due 2024
 
1,000

 
1,000

5⅜% Senior Notes due 2026
 
700

 
700

Total senior unsecured debt
 
2,450

 
2,489

Debt issuance costs
 
(19
)
 
(22
)
Total long-term debt
 
$
2,431

 
$
2,467