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Debt Obligations Senior Unsecured Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 19, 2013
Dec. 18, 2012
Sep. 17, 2012
Debt Instrument [Line Items]          
Long-term Debt $ 3,183        
Long-term debt 2,980 $ 2,939      
5% Notes Due 2022 [Member]          
Debt Instrument [Line Items]          
Long-term Debt         $ 600
Debt instrument stated percentage         5.00%
Percentage of Principle Amount Notes Were Sold At         100.00%
Long-term debt $ 600 600      
5% Notes Due 2022 [Member] | Twelve Month Period Commencing On July 15, 2017 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 102.50%        
5% Notes Due 2022 [Member] | Twelve Month Period Commencing On July 15, 2018 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 101.667%        
5% Notes Due 2022 [Member] | Twelve Month Period Commencing On July 15, 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 100.833%        
5% Notes Due 2022 [Member] | Twelve Month Period Commencing On July 15, 2020 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 100.00%        
4.625% Notes Due 2021 [Member] [Member]          
Debt Instrument [Line Items]          
Long-term Debt       $ 500  
Debt instrument stated percentage       4.625%  
Percentage of Principle Amount Notes Were Sold At       100.00%  
Long-term debt $ 500 500      
4.625% Notes Due 2021 [Member] [Member] | Twelve Month Period Commencing On February 15, 2017 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 102.313%        
4.625% Notes Due 2021 [Member] [Member] | Twelve Month Period Commencing On February 15, 2018 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 101.156%        
4.625% Notes Due 2021 [Member] [Member] | Twelve Month Period Commencing On February 15, 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 100.00%        
5.875% Notes due 2021 [Member]          
Debt Instrument [Line Items]          
Long-term Debt     $ 400    
Debt instrument stated percentage     5.875%    
Percentage of Principle Amount Notes Were Sold At     100.00%    
Long-term debt $ 400 400      
5.875% Notes due 2021 [Member] | Twelve Month Period Commencing On December 15, 2017 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 102.938%        
5.875% Notes due 2021 [Member] | Twelve Month Period Commencing On December 15, 2018 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 101.469%        
5.875% Notes due 2021 [Member] | Twelve Month Period Commencing On December 15, 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 100.00%        
6.375% Notes due 2023 [Member]          
Debt Instrument [Line Items]          
Long-term Debt     $ 700    
Debt instrument stated percentage     6.375%    
Percentage of Principle Amount Notes Were Sold At     100.00%    
Long-term debt $ 700 $ 700      
6.375% Notes due 2023 [Member] | Twelve Month Period Commencing On December 15, 2018 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 103.188%        
6.375% Notes due 2023 [Member] | Twelve Month Period Commencing On December 15, 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 102.125%        
6.375% Notes due 2023 [Member] | Twelve Month Period Commencing On December 15, 2020 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 101.063%        
6.375% Notes due 2023 [Member] | Prior To December 15, 2018 [Member]          
Debt Instrument [Line Items]          
Debt Instrument Redemption Price As Percentage Of Principle Amount 100.00%