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Debt - Recourse Debt (Details) $ in Millions				1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 16, 2014 USD ($)	May. 20, 2014 USD ($)	Mar. 07, 2014 USD ($)	Apr. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Feb. 28, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jul. 25, 2014 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt							$ 20	$ 47	$ 165	$ 196
Debt Instruments, notices to call, number											2
Senior Unsecured Note 775 Due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Notice Call to Retire Notes											$ 160
Senior Unsecured Note 975 Due 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Notice Call to Retire Notes											160
8% senior unsecured notes due 2017 and 2020 [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt									82
Senior Notes [Member] | 5.50% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.50%
Issued senior notes			$ 750
Senior Notes [Member] | Floating Rate Notes Due June 2019 [Member]
Debt Instrument [Line Items]
Issued senior notes		$ 775
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.00%
Senior Notes [Member] | 5.50% Percent Senior Notes Due 2025 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes				5.50%
Issued senior notes				$ 575
Unsecured Debt [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt								$ 40	$ 23	40
Debt Instrument, Notice Call to Retire Notes											$ 320
Unsecured Debt [Member] | 7.75% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Redeemed notes					$ 151
Interest rate on senior notes					7.75%
Unsecured Debt [Member] | 9.75% Senior Notes Due 2016 [Member] [Domain]
Debt Instrument [Line Items]
Redeemed notes					$ 164
Interest rate on senior notes					9.75%
Unsecured Debt [Member] | 7.75% Senior Notes Due 2014 [Member]
Debt Instrument [Line Items]
Redeemed notes						$ 110
Interest rate on senior notes						7.75%
Unsecured Debt [Member] | 8.0% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Redeemed notes			$ 625	$ 344
Interest rate on senior notes			8.00%	8.00%
Loss on extinguishment of debt										132
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain]
Debt Instrument [Line Items]
Redeemed notes				$ 156
Interest rate on senior notes				8.00%
Secured Debt [Member] | Senior Secured Term Loan Due 2018 [Member]
Debt Instrument [Line Items]
Redeemed notes	$ 29	$ 767
Loss on extinguishment of debt										$ 10

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