Disclosures About Segments And Related Information (Schedule Of Geographic Sales And Other Operating Revenue) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue		$ 279,332	$ 237,162	$ 200,628
U.S. [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue		96,930	82,079	70,126
Non-U.S. [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue		182,402	155,083	130,502
Canada [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	22,672	20,116	17,682
United Kingdom [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	18,702	16,611	15,452
Belgium [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	15,664	13,633	10,834
Singapore [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	13,689	11,589	9,919
France [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	13,637	11,235	9,487
Italy [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	13,396	11,476	9,715
Germany [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and other operating revenue	[1]	$ 9,426	$ 8,484	$ 7,899

[1] Revenue is determined by primary country of operations. Excludes certain sales and other operating revenues in Non-U.S. operations where attribution to a specific country is not practicable .