Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate (as a percent)		34.00%	40.00%
Increase (decrease) in net deferred tax liability	[1]	$ 9

[1] Refer to Note 9: Income Taxes for further discussion.