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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Long-term Debt | Our long-term debt consisted of the following (in millions):
|  | December 31,
|  | 2017 |  |  | 2016 |
Notes |  |  |  |
1.85% due 2018 |  | $ | 750 |  |  | $ | 750 |
4.25% due 2019 |  | 900 |  |  | 900 |
2.50% due 2020 |  | 1,250 |  |  | 1,250 |
3.35% due 2021 |  | 900 |  |  | 900 |
3.10% due 2023 |  | 500 |  |  | 500 |
2.90% due 2025 |  | 750 |  |  | 750 |
3.55% due 2026 |  | 2,000 |  |  | 2,000 |
3.60% due 2035 |  | 500 |  |  | 500 |
4.50% and 6.15% due 2036 |  | 1,054 |  |  | 1,152 |
4.85% due 2041 |  | 239 |  |  | 600 |
4.07% due 2042 |  | 1,336 |  |  | 1,336 |
3.80% due 2045 |  | 1,000 |  |  | 1,000 |
4.70% due 2046 |  | 1,326 |  |  | 2,000 |
4.09% due 2052 |  | 1,578 |  |  | — |
Other notes with rates from 5.50% to 8.50%, due 2023 to 2040 |  | 1,415 |  |  | 1,656 |
Total debt |  | 15,498 |  |  | 15,294 |
Less: unamortized discounts and issuance costs |  | (1,235 | ) |  | (1,012 | )
Total debt, net |  | 14,263 |  |  | 14,282 |
Less: current portion |  | (750 | ) |  | — |
Long-term debt, net |  | $ | 13,513 |  |  | $ | 14,282 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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