Debt - Senior Notes and Contingent Convertible Senior Notes Purchased ( Table Phantom) (Details)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2013 7.625% Senior Notes Due 2013	Jun. 30, 2013 6.625% Senior Notes Due 2019	Jun. 30, 2013 6.775% Senior Notes Due 2019	Jun. 30, 2013 Term Loan [Member] Senior Secured Term Loan Due Two Thousand And Seventeen [Member]	Jul. 15, 2013 Senior Notes 7.625% Senior Notes Due 2013	Jun. 30, 2013 Senior Notes 7.625% Senior Notes Due 2013	Jun. 30, 2013 Senior Notes 9.5% Senior Notes Due 2015	Jun. 30, 2013 Senior Notes 3.25% Senior Notes due 2016	Jun. 30, 2013 Senior Notes 6.5% Senior Notes Due 2017	Jun. 30, 2013 Senior Notes 6.875% Senior Notes Due 2018	Jun. 30, 2013 Senior Notes 7.25% Senior Notes Due 2018	Jun. 30, 2013 Senior Notes 6.625% Senior Notes Due 2019	Jun. 30, 2013 Senior Notes 6.775% Senior Notes Due 2019	Jun. 30, 2013 Senior Notes 6.625% Senior Notes Due 2020	Jun. 30, 2013 Senior Notes 6.875% Senior Notes Due 2020	Jun. 30, 2013 Senior Notes 5.375% Senior Notes due 2021 [Member]	Jun. 30, 2013 Senior Notes 6.125% Senior Notes Due 2021	Jun. 30, 2013 Senior Notes 5.75% Senior Notes due 2023 [Member]	Jun. 30, 2013 Senior Notes 2.75% Contingent Convertible Senior Notes Due 2035	Jun. 30, 2013 Senior Notes 2.5% Contingent Convertible Senior Notes due 2037	Jun. 30, 2013 Senior Notes 2.25% Contingent Convertible Senior Notes Due 2038
Long-Term Debt Instrument [Line Items]
Debt Instrument, Covenant Description	4.00 to 1.00	4.75 to 1.00	5.00 to 1.00	6.00 to 1.00
Debt Instrument Interest Rate Stated Percentage					7.625%	6.625%	6.775%		7.625%	7.625%	9.50%	3.25%	6.50%	6.875%	7.25%	6.625%	6.775%	6.625%	6.875%	5.375%	6.125%	5.75%	2.75%	2.50%	2.25%
Debt Instrument Maturity Year								2017		2013	2015	2016	2017	2018	2018	2019	2019	2020	2020	2021	2021	2023	2035	2037	2038