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Long-Term Debt (Other Debt and Interest Payments Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Interest Paid on borrowing $ 279,000,000 $ 307,000,000
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Derivative Liability, Number of Instruments Held | item 10  
Interest Rate Swap, Currently Effective [Member]    
Debt Instrument [Line Items]    
Notional Amount, Liability $ 2,600,000,000  
Credit Facility, Revolving Credit Loans [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 2.50%  
Credit Facility, Term Loan A [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 2.50%  
Secured Debt [Member] | Credit Facility, Term Loan G [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 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%  
Secured Debt [Member] | Credit Facility, Term Loan H [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Derivative, Basis Spread on Variable Rate 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%  
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%  
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%