Income Taxes (Schedule of U.S. Statutory Federal Income Tax Rate to Pre-tax Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory income tax rate	35.00%	35.00%	35.00%	35.00%
U.S. statutory rate at 35%	$ 70	$ 62	$ 105	$ 90
Tax on foreign income	(27)	(27)	(39)	(44)
Tax contingencies	1	0	8	0
Valuation allowance	2	5	5	10
Non-deductible impairment charge	0	0	1	15
Other items, net	3	10	6	12
Income tax provision	$ 49	$ 50	$ 86	$ 83