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Debt - Recourse Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2016 | Jan. 31, 2016 | Apr. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | May 16, 2016 | Jan. 01, 2016 | Apr. 02, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemed notes |  | $ 125 |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ 0 | $ (117) | $ 4 | $ (141) |  |  |
Senior Unsecured Note LIBOR plus 3% due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (4) |  |  |  |  |  |  |  |  |  |
8% senior unsecured notes due 2017 and 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  | $ 82 |  | 82 |  |  |
Senior Notes [Member] | 6.00% senior notes due 2026 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  | 6.00% |  |
Issued senior notes |  |  |  |  |  |  |  |  | $ 500 |  |
Senior Notes [Member] | Senior Unsecured Note LIBOR plus 3% due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemed notes | $ 495 |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 8.0% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  | 8.00%
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
Senior Notes [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  | 8.00%
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | $ (23) |  |  |
Unsecured Debt [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 7.375% |
Unsecured Debt [Member] | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 4.875% |
Unsecured Debt [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 5.50% |
Unsecured Debt [Member] | 5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 5.50% |
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] | 8.0% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemed notes |  |  | $ 344 |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemed notes |  |  | $ 156 |  |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | $ 7 |  |  |  |

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