Debt Obligations - Senior Unsecured Notes (Details) - USD ($) $ in Millions	Dec. 19, 2013	Dec. 18, 2012	Sep. 17, 2012
5% Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.00%
Percentage of Principle Amount Notes Were Sold At			100.00%
Long-term Debt			$ 600
4.625% Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.625%
Percentage of Principle Amount Notes Were Sold At		100.00%
Long-term Debt		$ 500
5.875% Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Percentage of Principle Amount Notes Were Sold At	100.00%
Long-term Debt	$ 400
6.375% Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Percentage of Principle Amount Notes Were Sold At	100.00%
Long-term Debt	$ 700