Organization and Summary of Significant Accounting Policies Principles of Consolidation and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
schedule of consolidation [Line Items]
Revenue	$ 2,033	$ 2,062	$ 6,140	$ 6,176
Adjusted EBITDA by Segment	716	657	2,141	1,957
Deferred Finance Costs, Current, Net					$ 19
Deferred Finance Costs, Noncurrent, Net					$ 109
Cash related to deconsolidated Venezuela operations			0	83
Latin America [Member]
schedule of consolidation [Line Items]
Adjusted EBITDA by Segment	$ 80	78	$ 218	237
VENEZUELA | Latin America [Member]
schedule of consolidation [Line Items]
Revenue		25		72
Adjusted EBITDA by Segment		$ 16		$ 46