Revenues, Geographic location (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of revenue [Abstract]
Sales and other operating revenues	$ 5,546	$ 9,048	$ 13,040	$ 17,826
United States [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	2,417	4,250	5,604	8,143
Germany [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	398	710	1,039	1,441
Italy [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	259	385	594	772
Mexico [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	203	431	583	959
China [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	302	298	545	596
Japan [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	143	255	478	458
France [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	161	363	431	725
Poland [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	188	252	412	521
The Netherlands [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	153	270	365	522
Other [Member]
Disaggregation of revenue [Abstract]
Sales and other operating revenues	$ 1,322	$ 1,834	$ 2,989	$ 3,689