Income Taxes - Effective Tax Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Consolidated effective tax rate	37.60%	36.60%
Accumulated undistributed foreign earnings	$ 2,200
Cumulative unrecognized deferred tax liabilities	$ 290
Internal Revenue Service (IRS) [Member] | Tax Years 2009 And 2010 [Member]
Income Tax Examination [Line Items]
Increase (decrease) to shareholders' net income resulting from IRS examination			$ 18