Revenues, Geographic location (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of revenue [Abstract]
Sales and other operating revenues	$ 7,494	$ 8,778
United States [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	3,187	3,893
Germany [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	641	731
Mexico [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	380	528
Italy [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	335	387
France [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	270	362
China [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	243	298
The Netherlands [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	212	252
Japan [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	335	203
Other [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	$ 1,891	$ 2,124