Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001534701 (http://www.sec.gov/CIK)

Inventory Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Inventory Disclosure [Abstract]
Summary of inventories	Inventories at December 31 consisted of the following:     Millions of Dollars   2016   2015         Crude oil and petroleum products $ 2,883   3,214 Materials and supplies 267   263   $ 3,150   3,477