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Debt - Recourse Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Debt Instrument [Line Items] |  |  |
Redeemed notes |  | $ 125 |
Gain (loss) on extinguishment of debt |  | $ 4 | $ (23)
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% |  | 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%
Parent Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt |  | $ 7 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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