Basis of Presentation (Unaudited) (Details 4) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Assets, Noncurrent	$ 1,163	$ 1,157
Long-term Debt and Capital Lease Obligations	$ 6,387	6,386
Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Assets, Noncurrent		(30)
Long-term Debt and Capital Lease Obligations		$ (30)