Income Taxes (Income Tax Contingency and Taxes Paid Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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	$ 2		$ 2
Effective Income Tax Rate, Continuing Operations	34.60%	30.10%	34.00%	103.60%
Cash Paid for Income Taxes, Net of Refunds Received [Abstract]
Cash paid for income taxes (refunds received), net	$ 8	$ 6	$ 9	$ (73)
Adjusted for the Expense Related to Income Attributable to Noncontrolling Interest [Member]
Income Tax Contingency [Abstract]
Effective Income Tax Rate, Continuing Operations			38.30%	35.60%