Accumulated Other Comprehensive Loss (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassifications out of accumulated other comprehensive income loss by component
Other (expense) income, net	$ (6)	$ 23
Net actuarial loss | Amount reclassified from accumulated other comprehensive loss
Reclassifications out of accumulated other comprehensive income loss by component
Other (expense) income, net	51	42
Prior service cost | Amount reclassified from accumulated other comprehensive loss
Reclassifications out of accumulated other comprehensive income loss by component
Other (expense) income, net	3	3
Defined benefit plan
Reclassifications out of accumulated other comprehensive income loss by component
Total before tax	(54)	(45)
Income tax benefit	(21)	(17)
Net of tax	$ 33	$ 28