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Debt Debt (First Lien Term Loans) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Long-term Debt     $ 10,156 $ 11,213  
Debt Issuance Costs, Net     112    
Gains (Losses) on Extinguishment of Debt     28 (38) $ (25)
2017 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Percentage of principal amount of Term Loan to be paid quarterly   0.25%      
First Lien Term Loan 2019 [Member]          
Debt Instrument [Line Items]          
Long-term Debt     $ 389 $ 389  
Debt Instrument, Interest Rate, Effective Percentage [1]     4.90% 4.10%  
2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term Debt     $ 1,059 $ 1,064  
Debt Instrument, Interest Rate, Effective Percentage [1]     5.40% 4.60%  
New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 562      
Debt Instrument Unamortized Discount Percent   1.00%      
Debt Issuance Costs, Net   $ 11      
2024 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term Debt [2]     $ 1,528 $ 1,542  
Debt Instrument, Interest Rate, Effective Percentage [1]     5.00% 4.20%  
Loans Payable [Member]          
Debt Instrument [Line Items]          
Long-term Debt     $ 2,976 $ 2,995  
2019 and 2020 First Lien Term Loans [Member]          
Debt Instrument [Line Items]          
Gains (Losses) on Extinguishment of Debt   $ (15)      
New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 400        
Percentage of principal amount of Term Loan to be paid quarterly 0.25%        
Debt Instrument Unamortized Discount Percent 1.00%        
Debt Issuance Costs, Net $ 8        
Federal Funds Effective Rate [Member] | New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   0.50%      
Federal Funds Effective Rate [Member] | New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Eurodollar Rate For A One-Month Interest Period [Member] | New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.00%      
Eurodollar Rate For A One-Month Interest Period [Member] | New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Prime Rate Or The Eurodollar Rate For a One Month Interest Period [Member] | New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.00%      
Prime Rate Or The Eurodollar Rate For a One Month Interest Period [Member] | New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 0.75%        
London Interbank Offered Rate (LIBOR) [Member] | New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.75%      
London Interbank Offered Rate (LIBOR) [Member] | New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.75%        
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New 2023 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   0.00%      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New 2019 First Lien Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.00%        
[1] Our weighted average interest rate calculation includes the amortization of debt issuance costs and debt discount.
[2] Our 2024 First Lien Term Loan carries substantially similar terms as our 2023 First Lien Term Loans as discussed below.