Disclosures About Segments And Related Information (Schedule of Geographic Sales And Operating Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	$ 32,277	$ 67,491	$ 87,411	$ 129,137
U.S. [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	10,854	23,819	30,311	44,659
Non-U.S. [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	21,423	43,672	57,100	84,478
Canada [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	2,148	5,346	5,971	10,196
United Kingdom [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	1,906	4,781	5,597	9,202
Singapore [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	1,867	3,135	4,483	6,255
France [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	1,583	3,258	4,172	6,332
Italy [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	1,228	2,494	3,186	5,139
Belgium [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	$ 1,247	$ 3,245	$ 3,136	$ 6,773