Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
UNITED STATES
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 3	$ 3	$ 10	$ 9
Interest cost	10	10	31	30
Expected return on plan assets	(17)	(17)	(52)	(50)
Amortization of prior service cost	1	2	4	6
Defined Benefit Plan, Amortization of Gain (Loss)	(5)	(5)	(14)	(14)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	0	4	0
Total pension cost	2	3	11	9
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			14
Pension estimated future employer contributions remainder of fiscal year	0		0
Foreign Plan [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	4	3	11	9
Interest cost	99	92	296	255
Expected return on plan assets	(73)	(59)	(219)	(164)
Amortization of prior service cost	0	0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)	(10)	(5)	(31)	(14)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	0	0	0
Total pension cost	40	$ 41	119	$ 114
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			118
Pension estimated future employer contributions remainder of fiscal year	$ 41		$ 41