Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined contribution plans
Costs related to defined contribution plans	$ 42	$ 158
U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	19	137
Non-U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	$ 23	$ 21