Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Debt

The following table summarizes our long-term debt at December 31, 2017 and 2016:

Millions of dollars	2017		2016
Senior note - 1.35%, maturing 2017	$	—	$	250
Senior note - 1.65%, maturing 2017	—		300
Senior note - 4.50%, maturing 2018	363		327
Senior note - 2.40%, maturing 2019	250		250
Senior note - 0.625% maturing 2020	599		525
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 - 4.00%, maturing 2024	300		300
Senior note - 3.70%, maturing 2025	350		350
Senior note - 1.25% maturing 2026	594		517
Senior note - 1.10% maturing 2027	713		—
Senior note - 5.15% maturing 2043	249		249
Senior note - 4.50% maturing 2046	496		496
Other, net	4		22
	$	4,768	$	4,436
Less current maturities	376		560
Total long-term debt	$	4,392	$	3,876

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, 2017:

Millions of dollars
2018	$	376
2019	261
2020	597
2021	298
2022	298
Thereafter	2,938
Long-term debt, including current maturities	$	4,768

Schedule of Notes Payable

The following table summarizes the carrying value of notes payable at December 31, 2017 and 2016, respectively.

Millions of dollars	2017		2016
Commercial paper	$	401	$	—
Short-term borrowings to banks	49		34
Total notes payable	$	450	$	34