Pension Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 3	$ 4
Interest cost	12	11
Expected return on plan assets	(16)	(15)
Amortization of prior service cost	2	1
Amortization of net loss	3	7
Total pension cost	4	8
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions	54
Pension estimated future employer contributions remainder of fiscal year	1
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	4	7
Interest cost	122	139
Expected return on plan assets	(90)	(130)
Amortization of prior service cost	1	0
Amortization of net loss	8	20
Total pension cost	45	36
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions	47
Pension estimated future employer contributions remainder of fiscal year	$ 123