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Debt | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Debt | Debt Our total debt, including short-term borrowings and current maturities of long-term debt, consisted of the following:
| December 31
Millions of dollars | 2017 | 2016
5.0% senior notes due November 2045 | $ | 2,000 |  | $ | 2,000 |
3.8% senior notes due November 2025 | 2,000 |  | 2,000 |
3.5% senior notes due August 2023 | 1,100 |  | 1,100 |
4.85% senior notes due November 2035 | 1,000 |  | 1,000 |
7.45% senior notes due September 2039 | 1,000 |  | 1,000 |
4.75% senior notes due August 2043 | 900 |  | 900 |
6.7% senior notes due September 2038 | 800 |  | 800 |
3.25% senior notes due November 2021 | 500 |  | 500 |
4.5% senior notes due November 2041 | 500 |  | 500 |
2.0% senior notes due August 2018 | 400 |  | 400 |
7.6% senior debentures due August 2096 | 300 |  | 300 |
8.75% senior debentures due February 2021 | 185 |  | 185 |
6.75% notes due February 2027 | 104 |  | 104 |
6.15% senior notes due September 2019 | — |  | 1,000 |
5.9% senior notes due September 2018 | — |  | 400 |
7.53% notes due May 2017 | — |  | 45 |
Other | 251 |  | 260 |
Unamortized debt issuance costs and discounts | (98 | ) | (110 | )
Total | 10,942 |  | 12,384 |
Short-term borrowings and current maturities of long-term debt | (512 | ) | (170 | )
Total long-term debt | $ | 10,430 |  | $ | 12,214 |
Senior debt All of our senior notes and debentures rank equally with our existing and future senior unsecured indebtedness, have semiannual interest payments and have no sinking fund requirements. We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest. Our 7.60% and 8.75% senior debentures may not be redeemed prior to maturity. In March 2017, we used cash on hand to redeem an aggregate principal amount of $1.4 billion of senior notes, which consisted of $400 million of 5.9% senior notes due September 2018 and $1.0 billion of 6.15% senior notes due September 2019. In conjunction with this redemption, we terminated a series of interest rate swaps associated with these senior notes. As a result, we recorded $104 million in costs related to the early extinguishment of debt, which included the redemption premium and a write-off of the remaining original debt issuance costs and debt discount, partially offset by a gain from the termination of the related interest rate swap agreements. These debt extinguishment costs are included in interest expense on our consolidated statement of operations for the year ended December 31, 2017. We also repaid $45 million of notes that matured in May 2017. Our $400 million of 2.0% senior notes will mature in August 2018, which we intend to repay with cash on hand. Revolving credit facilities We have a revolving credit facility with a capacity of $3.0 billion which expires in July 2020. The facility is for working capital or general corporate purposes. The full amount of the revolving credit facility was available as of December 31, 2017. Debt maturities Our long-term debt matures as follows: $440 million in 2018, $30 million in 2019, $26 million in 2020, $709 million in 2021, $14 million in 2022 and the remainder in 2023 and thereafter.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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