Postretirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined contribution plans
Costs related to defined contribution plans	$ 103	$ 101
U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	85	83
Non-U.S. Plans
Defined contribution plans
Costs related to defined contribution plans	$ 18	$ 18