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Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consisted of the following:
($ in millions)September 30, 2020December 31, 2019
Senior notes due November 15, 2025, 5.000%$600 $600 
Senior notes due December 1, 2027, 3.483%600 600 
Senior notes due May 1, 2025, 3.844%500 — 
Senior notes due May 1, 2030, 4.200%500 — 
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(27)(19)
Total long-term debt$2,278 $1,286