Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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Debt - Recourse Debt (Details) - USD ($) $ in Millions				1 Months Ended			3 Months Ended			6 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Jun. 16, 2014	May. 20, 2014	Mar. 07, 2014	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2014	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Apr. 02, 2015
Debt Instrument [Line Items]
Loss on extinguishment of debt							$ 122	$ (23)	$ 15	$ 145	$ 149
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		$ 775	$ 750
Senior Notes [Member] \| Floating Rate Notes Due June 2019 [Member]
Debt Instrument [Line Items]
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] \| 7.75% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Interest rate on senior notes							7.75%			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%			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%
Recourse Debt [Member] \| 7.75% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Redeemed notes					$ 151
Secured Debt [Member] \| Senior Secured Term Loan Due 2018 [Member]
Debt Instrument [Line Items]
Redeemed notes	$ 29	$ 767
Loss on extinguishment of debt		$ (10)