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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule Of Carrying And Fair Values Of Long-Term Debt The carrying and fair values of the Company's long-term debt at December 31, 2021 and 2020 are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.
20212020
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
3.60% 2022 Senior Notes
$250 $252 $249 $259 
0.875% 2024 Senior Notes
298 287 — — 
3.60% 2026 Senior Notes
745 805 744 846 
Loan related to tax-exempt waste disposal revenue bonds due 2027
11 11 11 11 
1.625% 2029 Senior Notes
786 824 849 897 
3.375% 2030 Senior Notes
296 319 296 332 
3.50% 2032 GO Zone Refunding Senior Notes
249 271 249 276 
2.875% 2041 Senior Notes
339 339 — — 
5.0% 2046 Senior Notes
678 885 677 905 
4.375% 2047 Senior Notes
492 592 491 597 
3.125% 2051 Senior Notes
577 582 — — 
3.375% 2061 Senior Notes
431 432 — — 
8.73% 2022 RS Cogen Debt
19 19 — — 
2026 Term Loans9 9 — —