Debt (Recourse Debt Carrying Amount and Terms) (Details) (USD $) In Millions, unless otherwise specified																															12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 7.75% Senior Unsecured Note Due 2014	Dec. 31, 2012 7.75% Senior Unsecured Note Due 2014	Dec. 31, 2013 7.75% Senior Unsecured Note Due 2015	Dec. 31, 2012 7.75% Senior Unsecured Note Due 2015	Dec. 31, 2013 9.75% Senior Unsecured Note Due 2016	Dec. 31, 2012 9.75% Senior Unsecured Note Due 2016	Dec. 31, 2013 8.00% Senior Unsecured Note Due 2017	Dec. 31, 2012 8.00% Senior Unsecured Note Due 2017	Dec. 31, 2013 Senior Secured Term Loan LIBOR Plus 2.75% Due 2018	Dec. 31, 2012 Senior Secured Term Loan LIBOR Plus 2.75% Due 2018	Dec. 31, 2013 8.00% Senior Unsecured Note Due 2020	Dec. 31, 2012 8.00% Senior Unsecured Note Due 2020	Dec. 31, 2013 7.375% Senior Unsecured Note Due 2021	Dec. 31, 2012 7.375% Senior Unsecured Note Due 2021	Dec. 31, 2013 4.875% Senior Unsecured Note Due 2023	Dec. 31, 2012 4.875% Senior Unsecured Note Due 2023	Dec. 31, 2013 6.75% Term Convertible Trust Securities Due 2029	Dec. 31, 2012 6.75% Term Convertible Trust Securities Due 2029	Dec. 31, 2013 Unamortized Discounts	Dec. 31, 2012 Unamortized Discounts	Dec. 31, 2013 Recourse Debt 7.75% Senior Unsecured Note Due 2014	Dec. 31, 2012 Recourse Debt 7.75% Senior Unsecured Note Due 2014	Dec. 31, 2013 Recourse Debt 7.75% Senior Unsecured Note Due 2015	Dec. 31, 2012 Recourse Debt 7.75% Senior Unsecured Note Due 2015	Dec. 31, 2013 Recourse Debt 9.75% Senior Unsecured Note Due 2016	Dec. 31, 2012 Recourse Debt 9.75% Senior Unsecured Note Due 2016	Dec. 31, 2013 Recourse Debt 8.00% Senior Unsecured Note Due 2017	Dec. 31, 2012 Recourse Debt 8.00% Senior Unsecured Note Due 2017	Dec. 31, 2013 Recourse Debt Senior Secured Term Loan LIBOR Plus 2.75% Due 2018 LIBOR	Dec. 31, 2013 Recourse Debt 8.00% Senior Unsecured Note Due 2020	Dec. 31, 2012 Recourse Debt 8.00% Senior Unsecured Note Due 2020	Dec. 31, 2013 Recourse Debt 7.375% Senior Unsecured Note Due 2021	Dec. 31, 2012 Recourse Debt 7.375% Senior Unsecured Note Due 2021	Dec. 31, 2013 Recourse Debt 4.875% Senior Unsecured Note Due 2023	Dec. 31, 2012 Recourse Debt 4.875% Senior Unsecured Note Due 2023	Dec. 31, 2013 Recourse Debt 6.75% Term Convertible Trust Securities Due 2029	Dec. 31, 2012 Recourse Debt 6.75% Term Convertible Trust Securities Due 2029
Debt Instrument [Line Items]
Interest Rate																							7.75%	7.75%	7.75%	7.75%	9.75%	9.75%	8.00%	8.00%		8.00%	8.00%	7.38%	7.38%	4.88%	4.88%	6.75%	6.75%
Basis spread on variable rate																															2.75%
Recourse Debt Total	$ 5,669	$ 5,962	$ 110	$ 500	$ 356	$ 500	$ 369	$ 535	$ 1,150	$ 1,500	$ 799	$ 807	$ 625	$ 625	$ 1,000	$ 1,000	$ 750	$ 0	$ 517	$ 517	$ (7)	$ (22)
Recourse Debt Current	(118)	(11)
Recourse Debt Non Current	$ 5,551	$ 5,951