Deferred Charges and Other Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Charges and Other Assets
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
Deferred Charges and Other Assets (Textual)
Amortization expense, deferred refinery turnaround and catalyst costs and other assets	$ 650	$ 575	$ 542