Deferred Charges and Other Assets

12 Months Ended

Dec. 31, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

DEFERRED CHARGES AND OTHER ASSETS

6. DEFERRED CHARGES AND OTHER ASSETS

“Deferred charges and other assets, net” consisted of the following (in millions):

	December 31,
	2017		2016
Deferred turnaround and catalyst costs, net	$	1,520	$	1,614
Income taxes receivable	673		447
Investments in joint ventures	530		201
Intangible assets, net	142		148
Other	501		491
Deferred charges and other assets, net	$	3,366	$	2,901

Amortization expense for the deferred charges and other assets shown above was $650 million, $575 million, and $542 million for the years ended December 31, 2017, 2016, and 2015, respectively.