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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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