Deferred Charges and Other Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Charges and Other Assets
Deferred turnaround and catalyst costs, net	$ 1,703	$ 1,778
Operating lease ROU assets, net (see Note 6)	1,204	1,329
Investments in unconsolidated joint ventures	972	942
Income taxes receivable	589	525
Intangible assets, net	248	283
Goodwill	260	260
Other	565	514
Deferred charges and other assets, net	5,541	5,631
Deferred Charges and Other Assets (Textual)
Amortization expense, deferred turnaround and catalyst costs and intangible assets	$ 748	$ 759	$ 668