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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Summary Of Carrying And Fair Values Of Long-Term Debt
The carrying and fair values of the Company's long-term debt are summarized in the table below.
March 31, 2021December 31, 2020
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
3.60% 2022 Senior Notes
$250 $257 $249 $259 
3.60% 2026 Senior Notes
744 809 744 846 
Loan related to tax-exempt waste disposal revenue bonds due 2027
11 11 11 11 
1.625% 2029 Senior Notes
811 855 849 897 
3.375% 2030 Senior Notes
296 312 296 332 
3.50% 2032 GO Zone Refunding Senior Notes
249 275 249 276 
5.0% 2046 Senior Notes
678 827 677 905 
4.375% 2047 Senior Notes
491 544 491 597 
8.73% 2022 RS Cogen Debt
34 34 — — 
2026 Term Loans— —