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Financing Agreements - Long Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Apr. 04, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Principal $ 1,804   $ 1,670
Unamortized Debt Issue Costs $ (22)   $ (21)
Senior Notes Due September 2021 [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.375%   5.375%
Principal $ 0   $ 450
Unamortized Debt Issue Costs $ 0   $ (5)
Senior Notes Due September 2023 [Member]      
Debt Instrument [Line Items]      
Interest Rate 6.00%   6.00%
Principal $ 300   $ 300
Unamortized Debt Issue Costs $ (4)   $ (4)
Senior Notes Due December 2024 [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.50%   5.50%
Principal $ 425   $ 425
Unamortized Debt Issue Costs $ (5)   $ (6)
Senior Notes Due April 2025 [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.75% [1] 5.75%  
Principal $ 400    
Unamortized Debt Issue Costs $ (6)    
Senior Notes Due April 2025 [Member] | Cash Flow Hedging [Member]      
Debt Instrument [Line Items]      
Interest Rate 5.75%    
Derivative, fixed interest rate 3.85%    
Senior Notes Due June 2026 [Member]      
Debt Instrument [Line Items]      
Interest Rate [1] 6.50%   6.50%
Principal $ 375   $ 375
Unamortized Debt Issue Costs $ (6)   (6)
Senior Notes Due June 2026 [Member] | Cash Flow Hedging [Member]      
Debt Instrument [Line Items]      
Interest Rate 6.50%    
Derivative, fixed interest rate 5.14%    
Term Facility [Member]      
Debt Instrument [Line Items]      
Principal $ 275    
Unamortized Debt Issue Costs (1)    
Other Indebtedness      
Debt Instrument [Line Items]      
Principal $ 29   $ 120
[1] *In conjunction with the issuance of the April 2025 Notes we entered into 8-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the April 2025 Notes to euro-denominated debt at a fixed rate of 3.850%. See Note 15 for additional information. In conjunction with the issuance of the June 2026 Notes we entered into 10-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the June 2026 Notes to euro denominated debt at a fixed rate of 5.140%. See Note 15 for additional information.