Employee Benefit Plans - Postemployment (Details) - Postemployment Benefit Plans Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 4	$ 4	$ 8	$ 8
Interest cost	1	1	1	2
Prior service cost (benefit)	(2)	(1)	(3)	(2)
Actuarial loss	(1)	0	(2)	0
Defined Benefit Plan Gross Periodic Benefit Cost	2	4	4	8
Severance Costs	2	(3)	2	(5)
Net benefit cost	4	$ 1	6	$ 3
Defined Benefit Plan, Contributions by Employer	11		21
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 33		33
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 12