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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Capital leases $ 98 $ 107
Total debt 3,256 3,573
Less: current portion 46 45
Long-term debt 3,210 3,528
Secured Debt [Member] | Revolver Borrowings [Member] | Dollar Denominated [Member]
   
Debt Instrument [Line Items]    
Variable Interest rate percentage 4.25% 4.25%
Variable Interest rate description Libor+4 1/4 % Libor+4 1/4 %
Maturity Jun. 30, 2018 Jun. 30, 2018
Long-term debt     
Secured Debt [Member] | Term Loans [Member] | Dollar Denominated [Member]
   
Debt Instrument [Line Items]    
Variable Interest rate percentage 5.00% 5.00%
Variable Interest rate description Libor+5 % Libor+5 %
Maturity Jun. 30, 2019 Jun. 30, 2019
Long-term debt 1,519 1,525
Secured Debt [Member] | Second Lien Credit Agreement [Member] | Tranche 1 Dollar Denominated Term Loan [Member]
   
Debt Instrument [Line Items]    
Variable Interest rate percentage 8.00% 8.00%
Variable Interest rate description Libor+8 % Libor+8 %
Maturity Jan. 31, 2016 Jan. 31, 2016
Long-term debt 647 644
Secured Debt [Member] | Second Lien Credit Agreement [Member] | Tranche 2 Dollar Denominated Term Loan [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 8.375% 8.375%
Maturity Dec. 31, 2016 Dec. 31, 2016
Long-term debt 239 234
Unsecured Debt [Member] | Senior Notes [Member] | Dollar Denominated Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 13.875% 13.875%
Maturity Mar. 31, 2016 Mar. 31, 2016
Long-term debt 370 411
Unsecured Debt [Member] | Senior Notes [Member] | Dollar Denominated Floating Rate Notes [Member]
   
Debt Instrument [Line Items]    
Variable Interest rate percentage 8.625% 8.625%
Variable Interest rate description Libor+8 5/8 % Libor+8 5/8 %
Maturity Mar. 31, 2016 Mar. 31, 2016
Long-term debt 177 188
Unsecured Debt [Member] | Senior Subordinated Notes [Member] | Dollar Denominated Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 11.875% 11.875%
Maturity Sep. 30, 2016 Sep. 30, 2016
Long-term debt 159 272
Unsecured Debt [Member] | Senior Subordinated Notes [Member] | Euro Denominated Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate percentage 10.875% 10.875%
Maturity Sep. 30, 2016 Sep. 30, 2016
Long-term debt $ 47 $ 192