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Debt Obligations Senior Unsecured Notes (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
5% Notes Due 2022 [Member]
Dec. 31, 2013
5% Notes Due 2022 [Member]
Sep. 17, 2012
5% Notes Due 2022 [Member]
Sep. 30, 2014
5% Notes Due 2022 [Member]
Twelve Month Period Commencing On July 15, 2017 [Member]
Sep. 30, 2014
5% Notes Due 2022 [Member]
Twelve Month Period Commencing On July 15, 2018 [Member]
Sep. 30, 2014
5% Notes Due 2022 [Member]
Twelve Month Period Commencing On July 15, 2019 [Member]
Sep. 30, 2014
5% Notes Due 2022 [Member]
Twelve Month Period Commencing On July 15, 2020 [Member]
Sep. 30, 2014
5% Notes Due 2022 [Member]
Prior to July 15, 2017 [Member]
Dec. 31, 2013
5% Notes Due 2022 [Member]
Prior to July 15, 2015 [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Dec. 31, 2013
4.625% Notes Due 2021 [Member] [Member]
Dec. 18, 2012
4.625% Notes Due 2021 [Member] [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Twelve Month Period Commencing On February 15, 2017 [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Twelve Month Period Commencing On February 15, 2018 [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Twelve Month Period Commencing On February 15, 2019 [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Prior To February 15, 2017 [Member]
Sep. 30, 2014
4.625% Notes Due 2021 [Member] [Member]
Prior to February 15, 2016 [Member]
Sep. 30, 2014
5.875% Notes due 2021 [Member]
Dec. 31, 2013
5.875% Notes due 2021 [Member]
Dec. 19, 2013
5.875% Notes due 2021 [Member]
Sep. 30, 2014
5.875% Notes due 2021 [Member]
Twelve Month Period Commencing On December 15, 2017 [Member]
Sep. 30, 2014
5.875% Notes due 2021 [Member]
Twelve Month Period Commencing On December 15, 2018 [Member]
Sep. 30, 2014
5.875% Notes due 2021 [Member]
Twelve Month Period Commencing On December 15, 2019 [Member]
Sep. 30, 2014
5.875% Notes due 2021 [Member]
Prior to December 15, 2016 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Dec. 31, 2013
6.375% Notes due 2023 [Member]
Dec. 19, 2013
6.375% Notes due 2023 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Twelve Month Period Commencing On December 15, 2018 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Twelve Month Period Commencing On December 15, 2019 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Twelve Month Period Commencing On December 15, 2020 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Prior To December 15, 2018 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Prior to December 15, 2016 [Member]
Sep. 30, 2014
6.375% Notes due 2023 [Member]
Twelve Month Period Commencing On December 15, 2021 [Member]
Debt Instrument [Line Items]                                                                      
Long-term Debt         $ 600                 $ 500                                          
Debt Instrument, Interest Rate, Stated Percentage         5.00%                 4.625%               5.875%             6.375%            
Percentage of Principle Amount Notes Were Sold At         100.00%                 100.00%               100.00%             100.00%            
Long-term debt $ 3,660 $ 3,320 $ 600 $ 600               $ 500 $ 500             $ 400 $ 400 $ 400         $ 700 $ 700 $ 700            
Debt Instrument Redemption Price As Percentage Of Principle Amount           102.50% 101.667% 100.833% 100.00% 100.00% 105.00%       102.313% 101.156% 100.00% 100.00% 104.625%       102.938% 101.469% 100.00% 105.875%       103.188% 102.125% 101.063% 100.00% 106.375% 100.00%
Debt Instrument, Note Redemption, Percentage of Aggregate Principle Amount                     35.00%               35.00%             35.00%               35.00%