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Financing Agreements - Additional Information (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Mar. 16, 2015
USD ($)
Jan. 08, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 31, 2013
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 29, 2015
USD ($)
Dec. 31, 2013
EUR (€)
Debt Instrument [Line Items]                            
Capital lease obligations reversed                         $ 6,000,000  
Loss on extinguishment of debt                 $ (19,000,000) $ (2,000,000) $ (19,000,000)    
Write-off of deferred financing costs                   1,000,000 4,000,000 $ 4,000,000    
Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Financing costs           $ 3,000,000                
Write-off of deferred financing costs           $ 2,000,000                
Current aggregate facility $ 500,000,000           $ 500,000,000     500,000,000        
Line of credit facility, unused capacity, benchmark             50.00%              
Line of credit facility, maximum letters of credit 300,000,000           $ 300,000,000     $ 300,000,000        
Fronting fee rate                   0.125%        
Line of credit facility, amount outstanding 0           0     $ 0        
Utilized letters of credit 37,000,000           37,000,000     37,000,000        
Borrowing base collateral 297,000,000           297,000,000     297,000,000        
Available borrowing capacity $ 260,000,000           $ 260,000,000     $ 260,000,000        
Minimum [Member] | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Commitment fee rate             0.25%              
Maximum [Member] | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Commitment fee rate             0.375%              
Senior Notes Due December 2024 [Member]                            
Debt Instrument [Line Items]                            
Senior notes issued       $ 425,000,000         $ 425,000,000   $ 425,000,000      
Net proceeds of the offerings       418,000,000                    
Financing costs       7,000,000                    
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period One [Member]                            
Debt Instrument [Line Items]                            
Debt redemption price 105.50%                          
Percent of notes outstanding minimum 50.00%           50.00%     50.00%        
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Percent of notes redeemable 35.00%                          
Senior Notes Due February 2019 [Member]                            
Debt Instrument [Line Items]                            
Senior notes redeemed   $ 15,000,000 $ 40,000,000 $ 345,000,000                    
Weighted average debt redemption price   103.25% 103.00% 104.116%                    
Loss on extinguishment of debt       $ 19,000,000       $ 2,000,000            
Write-off of deferred financing costs       $ 4,000,000                    
Senior Notes Sold In 2013 [Member]                            
Debt Instrument [Line Items]                            
Senior notes issued         $ 750,000,000                  
Net proceeds of the offerings         734,000,000                  
Financing costs         $ 16,000,000                  
Senior Notes Due February 2021 [Member] | Debt Instrument, Redemption, Period One [Member]                            
Debt Instrument [Line Items]                            
Debt redemption price 103.00%                          
Senior Notes Due February 2021 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Percent of notes redeemable 10.00%                          
Senior Notes Due September 2021 [Member] | Debt Instrument, Redemption, Period One [Member]                            
Debt Instrument [Line Items]                            
Debt redemption price 105.375%                          
Percent of notes outstanding minimum 50.00%           50.00%     50.00%        
Senior Notes Due September 2021 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Percent of notes redeemable 35.00%                          
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period One [Member]                            
Debt Instrument [Line Items]                            
Debt redemption price 106.00%                          
Percent of notes outstanding minimum 50.00%           50.00%     50.00%        
Senior Notes Due September 2023 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Percent of notes redeemable 35.00%                          
European Receivables Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Write-off of deferred financing costs                       2,000,000    
Current aggregate facility                       103,000,000   € 75,000,000
Line of credit facility, amount outstanding                       $ 0