Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies Debt Reclassifications Table (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other long-term assets	$ 311	$ 290
Long-term debt, net	10,062	10,311
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other long-term assets		333
Long-term debt, net		$ 10,354
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other long-term assets	(43)
Long-term debt, net	$ 43