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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 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.
September 30, 2021December 31, 2020
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
3.60% 2022 Senior Notes
$250 $254 $249 $259 
0.875% 2024 Senior Notes
298 301 — — 
3.60% 2026 Senior Notes
744 825 744 846 
Loan related to tax-exempt waste disposal revenue bonds due 2027
11 11 11 11 
1.625% 2029 Senior Notes
802 860 849 897 
3.375% 2030 Senior Notes
296 325 296 332 
3.50% 2032 GO Zone Refunding Senior Notes
249 276 249 276 
2.875% 2041 Senior Notes
339 337 — — 
5.0% 2046 Senior Notes
678 872 677 905 
4.375% 2047 Senior Notes
492 577 491 597 
3.125% 2051 Senior Notes
577 571 — — 
3.375% 2061 Senior Notes
431 427 — — 
8.73% 2022 RS Cogen Debt
24 24 — — 
2026 Term Loans— —