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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate on income from operations	17.00%	24.00%	43.00%	26.00%
Effective income tax rate, estimated			52.00%
U.S. statutory federal rate, expected (benefit) provision			35.00%
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 40		$ 40
Foreign Earnings Repatriated			300
Deferred Tax Assets, Valuation Allowance	541		541		$ 542
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	5	$ (48)	(1)	$ (60)
Liability for Uncertain Tax Positions, Noncurrent	274		$ 274		$ 257
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Acquisition	$ 14

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