Income Taxes - Effective Tax Rates (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Abstract]
Consolidated effective tax rate	37.80%	36.50%
Accumulated undistributed foreign earnings	$ 2,100
Cumulative unrecognized deferred tax liabilities	$ 240