Supplemental Income Statement Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental Income Statement Information
Interest expense	$ 123	$ 104
Interest income	(10)	(20)
Pension and postretirement net periodic benefit cost (benefit)	(17)	(36)
Total	$ 96	$ 48