Fair Value Measurements (Tables)

6 Months Ended

Jun. 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.

	June 30, 2021				December 31, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.60% 2022 Senior Notes	$	250	$	256	$	249	$	259
3.60% 2026 Senior Notes	744		818		744		846
Loan related to tax-exempt waste disposal revenue bonds due 2027	11		11		11		11
1.625% 2029 Senior Notes	822		872		849		897
3.375% 2030 Senior Notes	296		324		296		332
3.50% 2032 GO Zone Refunding Senior Notes	249		273		249		276
5.0% 2046 Senior Notes	678		881		677		905
4.375% 2047 Senior Notes	491		585		491		597
8.73% 2022 RS Cogen Debt	30		30		—		—
2026 Term Loans	4		4		—		—