Employee Benefit Plans - Postemployment (Details) - Postemployment Benefit Plans Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 4	$ 4
Interest cost	0	1
Prior service cost (benefit)	(1)	(1)
Actuarial loss	(1)	0
Defined Benefit Plan Gross Periodic Benefit Cost	2	4
Severance Costs	0	(2)
Net benefit cost	2	$ 2
Defined Benefit Plan, Contributions by Employer	10
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	33
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 23