Supplemental Income Statement Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Interest expense	$ 128	$ 121		$ 241	$ 253
Interest income	(11)	(8)		(19)	(12)
Pension and postretirement net periodic benefit cost (benefit)	(67)	(80)		(134)	(159)
Total	$ 50	$ 33		$ 88	$ 82
Fixed rate medium term note due 2022
Debt instrument
Loss on extinguishment of debt			$ 11