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Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Maturities of long-term debt | As of December 31, 2016, contractual maturities of debt for the years ending December 31 are as follows:
| Total |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Thereafter
| (In millions)
5.375% Notes | $ | 700 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 700 |
1.125% Convertible Notes | 550 |  |  | — |  |  | — |  |  | — |  |  | 550 |  |  | — |  |  | — |
1.625% Convertible Notes (1) | 302 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 302 |
| $ | 1,552 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 550 |  |  | $ | — |  |  | $ | 1,002 |
(1) | The 1.625% Notes have a contractual maturity date in 2044; however, on contractually specified dates beginning in 2018, holders of the 1.625% Notes may require us to repurchase some or all of the 1.625% Notes, or we may redeem any or all of the 1.625% Notes.
Long term debt | The principal amounts, unamortized discount (net of premium related to the 1.625% Notes), unamortized issuance costs, and net carrying amounts of debt were as follows:
| Principal Balance |  | Unamortized Discount |  | Unamortized Issuance Costs |  | Net Carrying Amount
| (In millions)
December 31, 2016: |  |  |  |  |  |  |
5.375% Notes | $ | 700 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 691 |
1.125% Convertible Notes | 550 |  |  | 73 |  |  | 6 |  |  | 471 |
1.625% Convertible Notes | 302 |  |  | 16 |  |  | 2 |  |  | 284 |
| $ | 1,552 |  |  | $ | 89 |  |  | $ | 17 |  |  | $ | 1,446 |
December 31, 2015: |  |  |  |  |  |  |
5.375% Notes | $ | 700 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 689 |
1.125% Convertible Notes | 550 |  |  | 95 |  |  | 7 |  |  | 448 |
1.625% Convertible Notes | 302 |  |  | 25 |  |  | 4 |  |  | 273 |
Other | 1 |  |  | — |  |  | — |  |  | 1 |
| $ | 1,553 |  |  | $ | 120 |  |  | $ | 22 |  |  | $ | 1,411 |
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,
| 2016 |  | 2015 |  | 2014
| (In millions)
Contractual interest at coupon rate | $ | 11 |  |  | $ | 11 |  |  | $ | 13 |
Amortization of the discount | 30 |  |  | 29 |  |  | 26 |
| $ | 41 |  |  | $ | 40 |  |  | $ | 39 |

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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=6928386&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=6479336&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=6928386&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=6928386&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=6928386&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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