Employee Benefit Plans - Postemployment (Details) - Postemployment Benefit Plans Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 14	$ 4
Interest cost	1	0
Amortization of prior service cost	(1)	(1)
Actuarial loss	(1)	(1)
Defined Benefit Plan Gross Periodic Benefit Cost	$ 13	$ 2