Income Taxes (Income Tax Contingency and Taxes Paid Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 5		$ 5
Amount of interest and penalties included in liabilities for uncertain tax positions	$ 3		$ 3
Effective Income Tax Rate, Continuing Operations	34.90%	31.30%	9.00%	33.30%
Cash Paid for Income Taxes, Net of Refunds Received [Abstract]
Cash paid for income taxes (refunds received), net	$ 2	$ 1	$ 6	$ 10
Adjusted for the Expense Related to Income Attributable to Noncontrolling Interest [Member]
Income Tax Contingency [Abstract]
Effective Income Tax Rate, Continuing Operations	27.40%	38.80%