Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net benefit cost	$ 0	$ (1)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	3
Interest cost	36	53
Expected return on plan assets	(39)	(56)
Prior service cost (benefit)	0	1
Defined Benefit Plan, Settlements, Benefit Obligation	0	(2)
Net benefit cost	0	(1)
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0
Interest cost	22	32
Expected return on plan assets	(18)	(30)
Prior service cost (benefit)	0	0
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Net benefit cost	4	2
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	3
Interest cost	14	21
Expected return on plan assets	(21)	(26)
Prior service cost (benefit)	0	1
Defined Benefit Plan, Settlements, Benefit Obligation	0	(2)
Net benefit cost	(4)	(3)
Defined Benefit Plan, Contributions by Employer	7
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	28
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 35