Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Contribution Plan
Costs related to defined contribution plans	$ 143	$ 146	$ 294	$ 188
U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	115	126	240	145
Non-U.S. Plans
Defined Contribution Plan
Costs related to defined contribution plans	$ 28	$ 20	$ 54	$ 43