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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Maturities of long-term debt | As of December 31, 2017, contractual maturities of debt for the years ending December 31 were as follows. All amounts represent the principal amounts of the debt instruments outstanding.
| Total |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter
| (In millions)
5.375% Notes | $ | 700 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 700 |  |  | $ | — |
1.125% Convertible Notes | 550 |  |  | — |  |  | — |  |  | 550 |  |  | — |  |  | — |  |  | — |
4.875% Notes | 330 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 330 |
Credit Facility | 300 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 300 |  |  | — |
1.625% Convertible Notes (1) | 161 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 161 |
| $ | 2,041 |  |  | $ | — |  |  | $ | — |  |  | $ | 550 |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | 491 |
(1) | The 1.625% Convertible Notes have a contractual maturity date in 2044. However, on contractually specified dates beginning in 2018, holders may convert, or may require us to repurchase some or all of the 1.625% Convertible Notes.
Long term debt | The following table summarizes our outstanding debt obligations and their classification in the accompanying consolidated balance sheets (in millions):
| December 31,
| 2017 |  | 2016
Current portion of long-term debt: |  |  |
1.125% Convertible Notes, net of unamortized discount | $ | 499 |  |  | $ | 477 |
1.625% Convertible Notes, net of unamortized premium and discount | 157 |  |  | — |
Lease financing obligations | 1 |  |  | 1 |
Debt issuance costs | (4 | ) |  | (6 | )
| 653 |  |  | 472 |
Non-current portion of long-term debt: |  |  |
5.375% Notes | 700 |  |  | 700 |
4.875% Notes | 330 |  |  | — |
Credit Facility | 300 |  |  | — |
1.625% Convertible Notes, net of unamortized premium and discount | — |  |  | 286 |
Debt issuance costs | (12 | ) |  | (11 | )
| 1,318 |  |  | 975 |
Lease financing obligations | 198 |  |  | 198 |
| $ | 2,169 |  |  | $ | 1,645 |
Debt instruments interest cost recognized | Interest cost recognized relating to our convertible senior notes for the periods presented was as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions)
Contractual interest at coupon rate | $ | 11 |  |  | $ | 11 |  |  | $ | 11 |
Amortization of the discount | 32 |  |  | 30 |  |  | 29 |
| $ | 43 |  |  | $ | 41 |  |  | $ | 40 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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