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LONG-TERM DEBT (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
LONG-TERM DEBT |
Long-term debt |
Balance at December 31, (in millions) |  | 2017 |  | 2016
1.50% senior notes due 2018 |  | $ | 500 |  | $ | 500
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
Variable rate bonds due 2030 (1.8% and 0.9% as of December 31, 2017 and 2016, respectively ) |  | 68 |  | 68
|  | 9,907 |  | 9,907
Less: |  |  |  |
Unamortized discount, net |  | (32) |  | (36)
Debt issuance costs |  | (47) |  | (52)
Current maturities |  | (500) |  | —
Total |  | $ | 9,328 |  | $ | 9,819

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