Pension, Savings and Other Postretirement Benefit Plans - Defined Benefit Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S.
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost — benefits earned during the period	$ 1	$ 1	$ 3	$ 3
Interest cost on projected benefit obligation	41	61	123	182
Expected return on plan assets	(64)	(75)	(191)	(225)
Amortization of net losses	28	27	82	81
Net periodic pension cost	6	14	17	41
Non-U.S.
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost — benefits earned during the period	7	11	22	33
Interest cost on projected benefit obligation	20	28	61	85
Expected return on plan assets	(21)	(26)	(67)	(79)
Amortization of net losses	7	9	21	28
Net periodic pension cost	13	22	37	67
Net curtailments/settlements/termination benefits	0	0	13	1
Total defined benefit pension cost	$ 13	$ 22	$ 50	$ 68