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Fair Value Measurements (Tables) | 3 Months Ended
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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, 2021 |  | December 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 |  | 4 |  |  | 4 |  |  | — |  |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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