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Debt (Details Textual) - Derivative Contract [Domain] - USD ($)
$ in Millions
1 Months Ended 7 Months Ended 12 Months Ended
Mar. 31, 2011
Jul. 23, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 23, 2018
Apr. 28, 2014
Dec. 30, 2013
Debt Instrument [Line Items]                  
Interest Expense     $ 135 $ 126 $ 128        
Debt (Textual) [Abstract]                  
Settlement received on close out of interest rate swap       13          
Loss on extinguishment of debt     0 60 0        
Payments of Debt Extinguishment Costs     0 65 0        
Principal amount of specific notes tendered and accepted for purchase       525          
Proceeds from Issuance of Medium-term Notes $ 800   0 522 0        
Repayments of debt     $ 15 536 15        
Document Fiscal Year Focus     2014            
Excess of interest rate over LIBOR Year 2016     1.50%            
Excess of interest rate over LIBOR Year One     1.70%            
Excess of interest rate over LIBOR Thereafter     1.85%            
Write off of unamortized debt issuance costs associated with debt repurchase     $ 0 2 0        
Write Down Of The Fair Value Adjustment To The Carrying Value Of Senior Notes In Connection With Interest Rate Swap     $ 0 7 0        
Maturity date of interest rate swaps     Jul. 15, 2015            
Senior Notes Due 2015 [Member]                  
Debt (Textual) [Abstract]                  
Interest rate on debt     5.625%            
Debt Instrument, Face Amount     $ 350            
Revolving Credit Facility [Member]                  
Debt (Textual) [Abstract]                  
Revolving credit facility     0 0          
Revolving $200 million credit facility [Member]                  
Debt (Textual) [Abstract]                  
Revolving credit facility     22            
Other Lines Credit Facility [Member]                  
Debt (Textual) [Abstract]                  
Revolving credit facility     3 4          
Revolving credit facility     1 0          
Revolving $500 million credit facility [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     4 0 0        
Debt (Textual) [Abstract]                  
Revolving credit facility     400         $ 300  
Interest Expense [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     135 126 128        
4.625% Senior Notes Due 2023 [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 11 $ 4 0        
Debt (Textual) [Abstract]                  
Interest rate on debt     4.625% 4.625%          
Debt Instrument, Face Amount       $ 250          
Effective interest rate     4.696%            
Senior notes, outstanding balance     $ 249 249          
5.625% senior notes due 2015                  
Debt Instrument [Line Items]                  
Interest Expense     $ 8 $ 12 12        
Debt (Textual) [Abstract]                  
Interest rate on debt     5.625% 5.625%          
Early Repayment of Senior Debt       $ 202          
Senior notes, outstanding balance     $ 0 148          
Fair Value adjustment on 5.625% senior notes due 2015 [Member]                  
Debt (Textual) [Abstract]                  
Interest rate on debt     5.625%            
Write Down Of The Fair Value Adjustment To The Carrying Value Of Senior Notes In Connection With Interest Rate Swap           $ 7      
Senior notes, outstanding balance     $ 0 4          
4.125% senior notes due 2016 [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 13 13 13        
Debt (Textual) [Abstract]                  
Interest rate on debt     4.125%            
Senior notes, outstanding balance     $ 299 299          
6.200% senior notes due 2017 [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 25 $ 33 38        
Debt (Textual) [Abstract]                  
Interest rate on debt     6.20% 6.20%          
Early Repayment of Senior Debt       $ 206          
Senior notes, outstanding balance     $ 394 394          
7.000% senior notes due 2019 [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 14 $ 18 21        
Debt (Textual) [Abstract]                  
Interest rate on debt     7.00% 7.00%          
Early Repayment of Senior Debt       $ 113          
Senior notes, outstanding balance     $ 187 187          
Seven Year Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     5 6 6        
Debt (Textual) [Abstract]                  
Debt 5-year term loan     242 259          
Debt Instrument, Face Amount     300            
Repayments of debt     $ 15            
Interest of Loan facility Description     LIBOR plus 1.50%            
Facility expiration date   Dec. 16, 2016 Jul. 23, 2018            
Outstanding Term Loan Facility Balance   $ 281              
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 3 2 1        
Debt (Textual) [Abstract]                  
Revolving credit facility   $ 500             $ 800
Revolving credit facility     $ 0            
Interest of Loan facility Description     LIBOR plus 1.50%            
5.750% senior notes due 2021 [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 30 29 29        
Debt (Textual) [Abstract]                  
Interest rate on debt     5.75%            
Other [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 6 3 8        
Six Point One Two Five Percent Senior Notes Due Two Thousand Forty Three [Member]                  
Debt Instrument [Line Items]                  
Interest Expense     $ 16 6 $ 0        
Debt (Textual) [Abstract]                  
Interest rate on debt     6.125%            
Debt Instrument, Face Amount     $ 275            
Effective interest rate     6.154%            
Senior notes, outstanding balance     $ 274 274          
Interest Expense [Member]                  
Debt (Textual) [Abstract]                  
Write off of unamortized debt issuance costs associated with debt repurchase       $ 2          
Debt [Member] | Seven Year Term Loan Facility [Member]                  
Debt (Textual) [Abstract]                  
Final repayment for credit facility             $ 186