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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule Of Long-Term Debt | Long-term debt consisted of the following at December 31:
|  | December 31, 2020 |  | December 31, 2019
|  | Principal Amount |  | Unamortized Discount and Debt Issuance Costs |  | Net Long-Term Debt |  | Principal Amount |  | Unamortized Discount and Debt Issuance Costs |  | Net Long-Term Debt
3.60% senior notes due 2022 (the "3.60% 2022 Senior Notes") |  | $ | 250 |  |  | $ | (1) |  |  | $ | 249 |  |  | $ | 250 |  |  | $ | (1) |  |  | $ | 249 |
3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes") |  | 750 |  |  | (6) |  |  | 744 |  |  | 750 |  |  | (8) |  |  | 742 |
Loan related to tax-exempt waste disposal revenue bonds due 2027 |  | 11 |  |  | — |  |  | 11 |  |  | 11 |  |  | — |  |  | 11 |
1.625% senior notes due 2029 (the "1.625% 2029 Senior Notes") |  | 859 |  |  | (10) |  |  | 849 |  |  | 785 |  |  | (11) |  |  | 774 |
6 ½% senior notes due 2029 (the "6 ½% 2029 GO Zone Senior Notes") |  | — |  |  | — |  |  | — |  |  | 100 |  |  | (1) |  |  | 99 |
3.375% senior notes due 2030 (the "3.375% 2030 Senior Notes") |  | 300 |  |  | (4) |  |  | 296 |  |  | — |  |  | — |  |  | — |
3.50% senior notes due 2032 (the "3.50% 2032 GO Zone Refunding Senior Notes") |  | 250 |  |  | (1) |  |  | 249 |  |  | 250 |  |  | (1) |  |  | 249 |
6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes") |  | — |  |  | — |  |  | — |  |  | 89 |  |  | (1) |  |  | 88 |
6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes") |  | — |  |  | — |  |  | — |  |  | 65 |  |  | — |  |  | 65 |
5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes") |  | 700 |  |  | (23) |  |  | 677 |  |  | 700 |  |  | (23) |  |  | 677 |
4.375% senior notes due 2047 (the "4.375% 2047 Senior Notes") |  | 500 |  |  | (9) |  |  | 491 |  |  | 500 |  |  | (9) |  |  | 491 |
Long-term debt |  | $ | 3,620 |  |  | $ | (54) |  |  | $ | 3,566 |  |  | $ | 3,500 |  |  | $ | (55) |  |  | $ | 3,445 |

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