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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt Long-term debt consists of the following:
June 30, 2021December 31, 2020
Principal
Amount		Unamortized
Discount
and Debt
Issuance
Costs		Net
Long-term
Debt		Principal
Amount		Unamortized
Discount
and Debt
Issuance
Costs		Net
Long-term
Debt
3.60% senior notes due 2022 (the "3.60% 2022 Senior Notes")
$250 $— $250 $250 $(1)$249 
3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes")
750 (6)744 750 (6)744 
Loan related to tax-exempt waste disposal revenue bonds due 202711 — 11 11 — 11 
1.625% senior notes due 2029 (the "1.625% 2029 Senior Notes")
831 (9)822 859 (10)849 
3.375% senior notes due 2030 (the "3.375% 2030 Senior Notes")
300 (4)296 300 (4)296 
3.50% senior notes due 2032 (the "3.50% 2032 GO Zone Refunding Senior Notes")
250 (1)249 250 (1)249 
5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes")
700 (22)678 700 (23)677 
4.375% senior notes due 2047 (the "4.375% 2047 Senior Notes")
500 (9)491 500 (9)491 
8.73% RS Cogen debt due 2022 (the "8.73% 2022 RS Cogen Debt")
30 — 30 — — — 
Term loans due 2026 (the "2026 Term Loans")4 — 4 — — — 
Total long-term debt3,626 (51)3,575 3,620 (54)3,566 
Less:
Current portion of 8.73% 2022 RS Cogen Debt - Classified in Accounts Payable
(20)— (20)— — — 
Long-term debt, net of current portion$3,606 $(51)$3,555 $3,620 $(54)$3,566