v3.19.3.a.u2
Disclosures About Segments And Related Information (Schedule Of Geographic Sales And Other Operating Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue $ 255,583 $ 279,332 $ 237,162
U.S. [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue 89,612 96,930 82,079
Non-U.S. [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue 165,971 182,402 155,083
Canada [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] 19,735 22,672 20,116
United Kingdom [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] 17,479 18,702 16,611
France [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] 12,740 13,637 11,235
Singapore [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] 12,128 13,689 11,589
Belgium [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] 11,644 15,664 13,633
Italy [Member]      
Segment Reporting Revenue Reconciling Item [Line Items]      
Sales and other operating revenue [1] $ 10,459 $ 13,396 $ 11,476
[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.