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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt
Long-term debt consisted of the following at December 31:
December 31, 2020December 31, 2019
Principal AmountUnamortized Discount and Debt Issuance CostsNet Long-Term DebtPrincipal AmountUnamortized Discount and Debt Issuance CostsNet Long-Term Debt
3.60% senior notes due 2022 (the "3.60% 2022 Senior Notes")
$250 $(1)$249 $250 $(1)$249 
3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes")
750 (6)744 750 (8)742 
Loan related to tax-exempt waste disposal revenue bonds due 2027
11 — 11 11 — 11 
1.625% senior notes due 2029 (the "1.625% 2029 Senior Notes")
859 (10)849 785 (11)774 
6 ½% senior notes due 2029 (the "6 ½% 2029 GO Zone Senior Notes")— — — 100 (1)99 
3.375% senior notes due 2030 (the "3.375% 2030 Senior Notes")
300 (4)296 — — — 
3.50% senior notes due 2032 (the "3.50% 2032 GO Zone Refunding Senior Notes")
250 (1)249 250 (1)249 
6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes")— — — 89 (1)88 
6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes")— — — 65 — 65 
5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes")
700 (23)677 700 (23)677 
4.375% senior notes due 2047 (the "4.375% 2047 Senior Notes")
500 (9)491 500 (9)491 
Long-term debt$3,620 $(54)$3,566 $3,500 $(55)$3,445