|**Fair Value Measurements and Disclosures (Details 3) (USD $)In Millions, unless otherwise specified**                                                                        | Dec. 31, 2013                                                                                                                                               | Dec. 31, 2012                                                                                                                                              
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------
|Carrying Amount                                                                                                                                                               |                                                                                                                                                             |                                                                                                                                                            
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                             |                                                                                                                                                             |                                                                                                                                                            
|Long-term Debt, Net of Unamortized Discount                                                                                                                                   | $ 4,465                                                                                                                                                     | [1]                                                                                                                                                        
|Fair Value                                                                                                                                                                    |                                                                                                                                                             |                                                                                                                                                            
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                             |                                                                                                                                                             |                                                                                                                                                            
|Long-term Debt, Net of Unamortized Discount                                                                                                                                   | $ 4,959                                                                                                                                                     | [1]                                                                                                                                                        
|                                                                                                                                                                             
|[1]
              Excludes capital lease and other obligations. No floating rate debt was outstanding at December 31, 2013 or December 31, 2012. See Note 10. Long-Term Debt. | [1]                                                                                                                                                         | Excludes capital lease and other obligations. No floating rate debt was outstanding at December 31, 2013 or December 31, 2012. See Note 10. Long-Term Debt.
|[1]                                                                                                                                                                           | Excludes capital lease and other obligations. No floating rate debt was outstanding at December 31, 2013 or December 31, 2012. See Note 10. Long-Term Debt.

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