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Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consisted of the following:
($ in millions)
 
September 30
2018
 
December 31
2017
Senior notes due November 15, 2025, 5.000%
 
600

 
600

Senior notes due December 1, 2027, 3.483%
 
600

 
600

Mississippi economic development revenue bonds due May 1, 2024, 7.81%
 
84

 
84

Gulf opportunity zone industrial development revenue bonds due December 1, 2028, 4.55%
 
21

 
21

Less unamortized debt issuance costs
 
(23
)
 
(26
)
Total long-term debt
 
$
1,282

 
$
1,279