Debt - Recourse Debt (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended			1 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 07, 2014 Recourse Debt [Member] 5.50% Senior Notes Due 2024 [Member]	May 20, 2014 Recourse Debt [Member] Floating Rate Notes Due June 2019 [Member]	May 20, 2014 Recourse Debt [Member] Floating Rate Notes Due June 2019 [Member]	Jul. 25, 2014 Recourse Debt [Member] Subsequent Event [Member]	Feb. 28, 2014 Recourse Debt [Member] 7.75% Senior Notes Due 2014 [Member]	Mar. 07, 2014 Recourse Debt [Member] 8.0% Senior Notes Due 2017 [Member]	Jun. 16, 2014 Recourse Debt [Member] Senior Secured Term Loan Due 2018 [Member]	May 20, 2014 Recourse Debt [Member] Senior Secured Term Loan Due 2018 [Member]	Jul. 25, 2014 Recourse Debt [Member] Senior Unsecured Note Due 2015 [Member] Subsequent Event [Member]	Jul. 25, 2014 Recourse Debt [Member] Senior Unsecured Note Due 2016 [Member] Subsequent Event [Member]
Debt Instrument [Line Items]
Redeemed notes									$ 110,000,000	$ 625,000,000	$ 29,000,000	$ 767,000,000
Interest rate on senior notes					5.50%				7.75%	8.00%
Issued senior notes					750,000,000		775,000,000
Loss on extinguishment of debt	15,000,000	165,000,000	149,000,000	212,000,000						132,000,000		10,000,000
Debt Instrument, Basis Spread on Variable Rate						3.00%
Debt Instrument, Notice Call to Retire Notes								$ 320,000,000					$ 160,000,000	$ 160,000,000