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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019 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.
|  | 2020 |  | 2019
|  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
3.60% 2022 Senior Notes |  | $ | 249 |  |  | $ | 259 |  |  | $ | 249 |  |  | $ | 255 |
3.60% 2026 Senior Notes |  | 744 |  |  | 846 |  |  | 742 |  |  | 777 |
Loan related to tax-exempt waste disposal revenue bonds due 2027 |  | 11 |  |  | 11 |  |  | 11 |  |  | 11 |
1.625% 2029 Senior Notes |  | 849 |  |  | 897 |  |  | 774 |  |  | 785 |
6 ½% 2029 GO Zone Senior Notes |  | — |  |  | — |  |  | 99 |  |  | 103 |
3.375% 2030 Senior Notes |  | 296 |  |  | 332 |  |  | — |  |  | — |
3.50% 2032 GO Zone Refunding Senior Notes |  | 249 |  |  | 276 |  |  | 249 |  |  | 267 |
6 ½% 2035 GO Zone Senior Notes |  | — |  |  | — |  |  | 88 |  |  | 92 |
6 ½% 2035 IKE Zone Senior Notes |  | — |  |  | — |  |  | 65 |  |  | 68 |
5.0% 2046 Senior Notes |  | 677 |  |  | 905 |  |  | 677 |  |  | 761 |
4.375% 2047 Senior Notes |  | 491 |  |  | 597 |  |  | 491 |  |  | 505 |

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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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