Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined contribution plans
Costs related to defined contribution plans	$ 99	$ 50	$ 286	$ 246
U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	83	31	235	188
Non-U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	$ 16	$ 19	$ 51	$ 58