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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Schedule Of Long-Term Debt | Long-term debt consists of the following:
|  | March 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
Revolving credit facility |  | $ | 1,000 |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
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 |  |  | (7 | ) |  | 743 |  |  | 750 |  |  | (8 | ) |  | 742 |
Loan related to tax-exempt waste disposal revenue bonds due 2027 |  | 11 |  |  | — |  |  | 11 |  |  | 11 |  |  | — |  |  | 11 |
6 ½% senior notes due 2029 (the "6 ½% 2029 GO Zone Senior Notes") |  | 100 |  |  | (1 | ) |  | 99 |  |  | 100 |  |  | (1 | ) |  | 99 |
6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes") |  | 89 |  |  | (1 | ) |  | 88 |  |  | 89 |  |  | (1 | ) |  | 88 |
6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes") |  | 65 |  |  | — |  |  | 65 |  |  | 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 |
3.50% senior notes due 2032 (the "3.50% 2032 GO Zone Refunding Senior Notes") |  | 250 |  |  | (1 | ) |  | 249 |  |  | 250 |  |  | (1 | ) |  | 249 |
1.625% senior notes due 2029 (the "1.625% 2029 Senior Notes") |  | 770 |  |  | (10 | ) |  | 760 |  |  | 785 |  |  | (11 | ) |  | 774 |
Total Long-term debt |  | $ | 4,485 |  |  | $ | (53 | ) |  | $ | 4,432 |  |  | $ | 3,500 |  |  | $ | (55 | ) |  | $ | 3,445 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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