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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate on income from operations	25.00%		26.00%
Effective income tax rate, estimated			24.00%
U.S. statutory federal rate, expected (benefit) provision			35.00%
U.S. taxes on foreign unremitted earnings			(7.00%)
Noncontrolling interests			(10.00%)
Deferred Tax Assets, Valuation Allowance	$ 526		$ 526		$ 538
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(13)	$ 10	(12)	$ 32
Liability for Uncertain Tax Positions, Noncurrent	235		235		$ 228
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 8	$ (3)	$ 7
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Period Increase (Decrease)				$ 1

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