Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 3	$ 4
Interest cost	10	12
Expected return on plan assets	(17)	(17)
Amortization of prior service cost	2	2
Amortization of net loss	5	5
Total pension cost	3	6
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions	21
Pension estimated future employer contributions remainder of fiscal year	0
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	3	4
Interest cost	81	102
Expected return on plan assets	(52)	(72)
Amortization of prior service cost	0	0
Amortization of net loss	4	8
Total pension cost	36	$ 42
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions	22
Pension estimated future employer contributions remainder of fiscal year	$ 72