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Debt - Recourse Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Jan. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 01, 2017 | Jan. 01, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes |  | $ 125 |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 17 | $ 4 |  |
7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes | $ 276 |  |  |  |  |
8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes | $ 24 |  |  |  |  |
Unsecured Debt [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 7.375% | 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] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 8.00% |
Parent Company [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (47) | $ 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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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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