Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined contribution plans
Costs related to defined contribution plans	$ 109	$ 84	$ 205	$ 187
U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	90	67	170	152
Non-U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	$ 19	$ 17	$ 35	$ 35