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Long-Term Debt (Other Debt and Interest Payments Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Debt Instrument [Line Items]        
Interest Paid on borrowing $ 279,000,000 $ 293,000,000 $ 767,000,000 $ 752,000,000
Interest Rate Swap [Member]        
Debt Instrument [Line Items]        
Derivative Liability, Number of Instruments Held | item 11   11  
Interest Rate Swap, Currently Effective [Member]        
Debt Instrument [Line Items]        
Notional Amount, Liability $ 2,700,000,000   $ 2,700,000,000  
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 F [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 3.25%   3.25%  
Secured Debt [Member] | Credit Facility, Term Loan G [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 2.75%   2.75%  
Secured Debt [Member] | Credit Facility, Term Loan G [Member] | Alternate Base Rate [Member]        
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 1.75%   1.75%  
Secured Debt [Member] | Credit Facility, Term Loan H [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 3.00%   3.00%  
Secured Debt [Member] | Credit Facility, Term Loan H [Member] | Alternate Base Rate [Member]        
Debt Instrument [Line Items]        
Derivative, Basis Spread on Variable Rate 2.00%   2.00%  
Secured Debt [Member] | Credit Facility, Term Loan G and Term Loan H [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate 1.00%   1.00%  
Secured Debt [Member] | Credit Facility, Term Loan G and Term Loan H [Member] | Alternate Base Rate [Member]        
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate 2.00%   2.00%