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Debt
 12 Months Ended
Dec. 31, 2018
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
2018
2017
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

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

2.0% senior notes due August 2018
—

400

Other
160

251

Unamortized debt issuance costs and discounts
(92
)
(98
)
Total
10,457

10,942

Short-term borrowings and current maturities of long-term debt
(36
)
(512
)
Total long-term debt
$
10,421

$
10,430


    
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.

During 2018, we repaid $400 million of 2.0% senior notes, which matured in August 2018.

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, 2018.

Debt maturities
Our long-term debt matures as follows: $34 million in 2019, $27 million in 2020, $696 million in 2021, $12 million in 2022, $1.1 billion in 2023 and the remainder in 2024 and thereafter.