Income Taxes (Income Tax Contingency and Taxes Paid Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 5
Amount of interest and penalties included in liabilities for uncertain tax positions	$ 3
Effective Income Tax Rate, Continuing Operations	41.30%	33.20%
Cash Paid for Income Taxes, Net of Refunds Received [Abstract]
Cash paid for income taxes (refunds received), net	$ 0	$ 1
Adjusted for the Expense Related to Income Attributable to Noncontrolling Interest [Member]
Income Tax Contingency [Abstract]
Effective Income Tax Rate, Continuing Operations	68.40%	37.80%