Properties, Plants and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Properties, Plants and Equipment with Associated Accumulated Depreciation and Amortization

Our gross investment in PP&E and the associated accumulated depreciation and amortization (Accum. D&A) balances were as follows:

	Millions of Dollars
	September 30, 2017				December 31, 2016
	Gross PP&E		Accum. D&A	Net PP&E	Gross PP&E	Accum. D&A	Net PP&E
Midstream	$	8,491	1,775	6,716	8,179	1,579	6,600
Chemicals	—		—	—	—	—	—
Refining	22,143		8,805	13,338	21,152	8,197	12,955
Marketing and Specialties	1,610		889	721	1,451	776	675
Corporate and Other	1,104		576	528	1,207	582	625
	$	33,348	12,045	21,303	31,989	11,134	20,855