Pension, Savings and Other Postretirement Benefit Plans - Defined Benefit Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
U.S.
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	41	40	81	82
Expected return on plan assets	(61)	(63)	(121)	(127)
Amortization of net losses	28	27	56	54
Net periodic pension cost	9	5	18	11
Net curtailments/settlements/termination benefits	1	0	1	0
Total defined benefit pension cost	10	5	19	11
Non-U.S.
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost	8	8	15	15
Interest cost	18	21	35	41
Expected return on plan assets	(20)	(24)	(39)	(46)
Amortization of net losses	8	7	16	14
Net periodic pension cost	14	12	27	24
Net curtailments/settlements/termination benefits	0	13	0	13
Total defined benefit pension cost	$ 14	$ 25	$ 27	$ 37