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Financing Arrangements (Tables)
12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes our long-term debt at December 31, 2016 and 2015:
Millions of dollars
2016
2015
Senior note - 6.5%, matured 2016
$

$
250

Debentures - 7.75%, matured 2016

244

Senior note - 1.35%, maturing 2017
250

250

Senior note - 1.65%, maturing 2017
300

300

Senior note - 4.5%, maturing 2018
327

345

Senior note - 2.4%, maturing 2019
250

250

Senior note - 0.625% maturing 2020
525

541

Senior note - 4.85%, maturing 2021
300

300

Senior note - 4.70%, maturing 2022
300

300

Senior note - 3.70%, maturing 2023
250

250

Senior note - 4.0%, maturing 2024
300

300

Senior note - 3.7%, maturing 2025
350

350

Senior note - 1.25% maturing 2026
517


Senior note - 5.15% maturing 2043
249

249

Senior note - 4.50% maturing 2046
496


Other
22

49

 
$
4,436

$
3,978

Less current maturities
560

508

Total long-term debt
$
3,876

$
3,470

Schedule of Maturities of Long-term Debt
The following table summarizes the contractual maturities of our long-term debt, including current maturities, at December 31, 2016:
Millions of dollars
 
2017
$
560

2018
342

2019
259

2020
524

2021
299

Thereafter
2,452

     Long-term debt, including current maturities
$
4,436