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Debt Credit Agreement (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2016
Line of Credit Facility [Line Items]            
Loss on extinguishment of debt $ (73) $ (52) $ (73) $ (58) $ (34)  
Amended and Restated Credit Agreement            
Line of Credit Facility [Line Items]            
Loss on extinguishment of debt     (3)      
Line of Credit Facility, Additional Borrowing Capacity     1,000      
Letters of Credit Issued     $ 7      
Amended and Restated Credit Agreement | JPMorgan Chase Bank, N.A.            
Line of Credit Facility [Line Items]            
Covenant Compliance, Maximum Ratio of Indebtedness to EBITDA     350.00%      
Revolving Credit Facility | Line of Credit            
Line of Credit Facility [Line Items]            
Amount drawn     $ 0      
Revolving Credit Facility | Revolving Credit Facility | JPMorgan Chase Bank, N.A.            
Line of Credit Facility [Line Items]            
Revolving Credit Facility, Maximum Borrowing Capacity     $ 2,000     $ 1,500
Revolving Credit Facility | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | LIBOR            
Line of Credit Facility [Line Items]            
Basis spread of variable rate     1.10% 1.00%    
Revolving Credit Facility | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | Administrative Agents Alternate Base Rate            
Line of Credit Facility [Line Items]            
Basis spread of variable rate     0.10% 0.00%    
Tranche A Term Loan, Due 2021 | Loans Payable            
Line of Credit Facility [Line Items]            
Debt Instrument, Maturity Date     Dec. 31, 2021      
Tranche A Term Loan, Due 2021 | JPMorgan Chase Bank, N.A. | Loans Payable            
Line of Credit Facility [Line Items]            
Borrowings     $ 400      
Tranche A Term Loan, Due 2021 | JPMorgan Chase Bank, N.A. | LIBOR | Loans Payable            
Line of Credit Facility [Line Items]            
Basis spread of variable rate     1.25% 1.00%    
Rate effective     2.00%      
Tranche A Term Loan, Due 2021 | JPMorgan Chase Bank, N.A. | Administrative Agents Alternate Base Rate | Loans Payable            
Line of Credit Facility [Line Items]            
Basis spread of variable rate     0.25% 0.00%