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Financing Agreements - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 16, 2015
Jan. 08, 2015
Dec. 31, 2014
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 27, 2016
Sep. 29, 2015
Debt Instrument [Line Items]                    
Capital lease obligations reversed                   $ 6,000,000
Loss on extinguishment of debt         $ (17,000,000) $ (17,000,000) $ (2,000,000) $ (19,000,000)    
Redemption premium           (12,000,000) (2,000,000) (15,000,000)    
Write-off of deferred financing costs           5,000,000 1,000,000 4,000,000    
Paid financing costs           11,000,000 7,000,000    
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Write-off of deferred financing costs         1,000,000          
Current aggregate facility $ 500,000,000         $ 500,000,000        
Paid financing costs         3,000,000          
Fronting fee rate           0.125%        
Line of credit facility, amount outstanding 0         $ 0        
Utilized for letters of credit 22,000,000         22,000,000        
Available borrowing capacity 478,000,000         478,000,000        
Maximum [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility applied to letters of credit $ 275,000,000         $ 275,000,000        
Senior Notes Due February 2021 [Member]                    
Debt Instrument [Line Items]                    
Loss on extinguishment of debt         16,000,000          
Redemption premium         12,000,000          
Write-off of deferred financing costs         $ 4,000,000          
Senior Notes Due February 2021 [Member] | Weighted Average [Member]                    
Debt Instrument [Line Items]                    
Debt redemption price         103.375%          
Senior Notes Due June 2026 [Member]                    
Debt Instrument [Line Items]                    
Senior notes issued                 $ 375,000,000  
Net proceeds of the offering         $ 368,000,000          
Financing costs                 $ 7,000,000  
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member]                    
Debt Instrument [Line Items]                    
Debt redemption price 106.50%                  
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Percent of original principal amount that must remain outstanding after the redemption           50.00%        
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Percent of notes redeemable 35.00%                  
Senior Notes Due June 2026 [Member] | Debt Instrument, Redemption, Period Two [Member]                    
Debt Instrument [Line Items]                    
Debt redemption price 100.00%                  
Senior Notes Due December 2024 [Member]                    
Debt Instrument [Line Items]                    
Senior notes issued       $ 425,000,000       425,000,000    
Net proceeds of the offering       418,000,000            
Financing costs       7,000,000       $ 7,000,000    
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period One [Member]                    
Debt Instrument [Line Items]                    
Debt redemption price 105.50%                  
Senior Notes Due December 2024 [Member] | Debt Instrument, Redemption, Period One [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Percent of original principal amount that must remain outstanding after the redemption           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]                    
Loss on extinguishment of debt   $ 2,000,000   19,000,000            
Write-off of deferred financing costs       4,000,000            
Senior notes redeemed   $ 15,000,000 $ 40,000,000 $ 345,000,000            
Senior Notes Due February 2019 [Member] | Weighted Average [Member]                    
Debt Instrument [Line Items]                    
Debt redemption price   103.25% 103.00% 104.116%