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Fair Value of Financial Instruments - Liabilities, Recurring (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 7.00%  
Fair Value, Measurements, Recurring | Reported Value Measurement [Member]    
Liabilities measured on a recurring basis    
Term Loans $ 4,566 $ 4,556
Senior Notes 6,135 6,126
Capital Leases and Other 183 199
Total Long-term Debt, including the current portion: 10,884 10,881
Fair Value, Measurements, Recurring | Unadjusted quoted prices in active markets for identical assets or liabilities (Level 1)    
Liabilities measured on a recurring basis    
Term Loans 4,671 4,570
Senior Notes 6,283 6,298
Capital Leases and Other 0 0
Total Long-term Debt, including the current portion: 10,954 10,868
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Liabilities measured on a recurring basis    
Term Loans 0 0
Senior Notes 0 0
Capital Leases and Other 183 199
Total Long-term Debt, including the current portion: $ 183 $ 199
2.0 Billion Tranche B-II 2022 Term Loan [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Floating Rate Senior Notes due 2018 [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 4.762% 4.101%
London Interbank Offered Rate (LIBOR) [Member] | TrancheBIII2019TermLoan [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 3.00%  
London Interbank Offered Rate (LIBOR) [Member] | TrancheB2020TermLoanTotal [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 3.00%  
London Interbank Offered Rate (LIBOR) [Member] | 2.0 Billion Tranche B-II 2022 Term Loan [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 2.75%  
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Senior Notes due 2018 [Member]    
Liabilities measured on a recurring basis    
Debt Instrument, Interest Rate, Stated Percentage 3.50%