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Debt - Recourse Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended |  |  | 1 Months Ended | 0 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 07, 2014 Recourse Debt [Member] 5.50% Senior Notes Due 2024 [Member] | May 20, 2014 Recourse Debt [Member] Floating Rate Notes Due June 2019 [Member] | May 20, 2014 Recourse Debt [Member] Floating Rate Notes Due June 2019 [Member] | Jul. 25, 2014 Recourse Debt [Member] Subsequent Event [Member] | Feb. 28, 2014 Recourse Debt [Member] 7.75% Senior Notes Due 2014 [Member] | Mar. 07, 2014 Recourse Debt [Member] 8.0% Senior Notes Due 2017 [Member] | Jun. 16, 2014 Recourse Debt [Member] Senior Secured Term Loan Due 2018 [Member] | May 20, 2014 Recourse Debt [Member] Senior Secured Term Loan Due 2018 [Member] | Jul. 25, 2014 Recourse Debt [Member] Senior Unsecured Note Due 2015 [Member] Subsequent Event [Member] | Jul. 25, 2014 Recourse Debt [Member] Senior Unsecured Note Due 2016 [Member] Subsequent Event [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemed notes |  |  |  |  |  |  |  |  | $ 110,000,000 | $ 625,000,000 | $ 29,000,000 | $ 767,000,000 |  |
Interest rate on senior notes |  |  |  |  | 5.50% |  |  |  | 7.75% | 8.00% |  |  |  |
Issued senior notes |  |  |  |  | 750,000,000 |  | 775,000,000 |  |  |  |  |  |  |
Loss on extinguishment of debt | 15,000,000 | 165,000,000 | 149,000,000 | 212,000,000 |  |  |  |  |  | 132,000,000 |  | 10,000,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Debt Instrument, Notice Call to Retire Notes |  |  |  |  |  |  |  | $ 320,000,000 |  |  |  |  | $ 160,000,000 | $ 160,000,000

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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