Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Contribution Plan
Costs related to defined contribution plans	$ 125	$ 90	$ 313	$ 362
U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	103	68	248	298
Non-U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	$ 22	$ 22	$ 65	$ 64