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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Long-term debt | Long-term debt consisted of the following:
Balance at December 31, (in millions) |  | 2018 |  | 2017
9.25% senior debentures due 2019 |  | $ | 116 |  |  | $ | 116 |
4.10% senior notes due 2021 |  | 1,249 |  |  | 1,249 |
3.125% senior notes due 2022 |  | 813 |  |  | 813 |
2.60% senior notes due 2022 |  | 400 |  |  | 400 |
2.70% senior notes due 2023 |  | 1,191 |  |  | 1,191 |
8.75% medium-term notes due 2023 |  | 22 |  |  | 22 |
3.50% senior notes due 2025 |  | 750 |  |  | 750 |
3.40% senior notes due 2026 |  | 1,150 |  |  | 1,150 |
3.00% senior notes due 2027 |  | 750 |  |  | 750 |
7.20% senior debentures due 2028 |  | 82 |  |  | 82 |
8.45% senior debentures due 2029 |  | 116 |  |  | 116 |
4.625% senior notes due 2045 |  | 750 |  |  | 750 |
4.40% senior notes due 2046 |  | 1,200 |  |  | 1,200 |
4.10% senior notes due 2047 |  | 750 |  |  | 750 |
4.20% senior notes due 2048 |  | 1,000 |  |  | — |
1.50% senior notes due 2018 |  | — |  |  | 500 |
Variable rate bonds due 2030 (1.9% and 1.8% as of December 31, 2018 and 2017, respectively ) |  | 68 |  |  | 68 |
|  | 10,407 |  |  | 9,907 |
Less: |  |  |  |
Unamortized discount, net |  | (36 | ) |  | (32 | )
Debt issuance costs |  | (54 | ) |  | (47 | )
Current maturities |  | (116 | ) |  | (500 | )
Total |  | $ | 10,201 |  |  | $ | 9,328 |

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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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