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Long-Term Debt (Other Debt and Interest Payments Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Debt Instrument [Line Items]        
Interest Paid, Net $ 308,000,000 $ 150,000,000 $ 661,000,000 $ 446,000,000
Interest Rate Swap [Member]
       
Debt Instrument [Line Items]        
Derivative Liability, Number of Instruments Held 8   8  
Interest Rate Swap, Currently Effective [Member]
       
Debt Instrument [Line Items]        
Notional Amount, Liability 1,500,000,000   1,500,000,000  
Interest Rate Swap, Not Yet Effective [Member]
       
Debt Instrument [Line Items]        
Derivative Liability, Number of Instruments Held 4   4  
Notional Amount, Liability $ 1,000,000,000   $ 1,000,000,000  
Credit Facility, Revolving Credit Loans [Member] | LIBOR [Member]
       
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 2.75%   2.75%  
Credit Facility, Term Loan A [Member] | LIBOR [Member]
       
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 2.75%   2.75%  
Credit Facility, Term Loan D [Member] | LIBOR [Member]
       
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 3.25%   3.25%  
Credit Facility, Term Loan E [Member] | LIBOR [Member]
       
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 3.25%   3.25%  
Secured Debt [Member] | Credit Facility, Term Loan D [Member] | LIBOR [Member]
       
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate 1.00%   1.00%  
Secured Debt [Member] | Credit Facility, Term Loan D [Member] | Alternate Base Rate [Member]
       
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate 2.00%   2.00%