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Long-Term Debt (Other Debt and Interest Payments Narrative) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]      
Interest Paid on borrowing $ 925,000,000 $ 831,000,000 $ 583,000,000
Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Derivative Liability, Number of Instruments Held | item 13    
Interest Rate Swap, Currently Effective [Member]      
Debt Instrument [Line Items]      
Notional Amount, Liability $ 3,000,000,000    
Interest Rate Swap, Not Yet Effective [Member]      
Debt Instrument [Line Items]      
Derivative Liability, Number of Instruments Held | item 2    
Notional Amount, Liability $ 500,000,000    
Credit Facility, Revolving Credit Loans [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Derivative, Basis Spread on Variable Rate 2.75%    
Credit Facility, Term Loan A [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Derivative, Basis Spread on Variable Rate 2.75%    
Credit Facility, Term Loan F [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Derivative, Basis Spread on Variable Rate 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%    
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%