Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Contribution Plan
Costs related to defined contribution plans	$ 143	$ 151
U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	114	125
Non-U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	$ 29	$ 26