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Debt and Capital Leases - Issuance of Senior Notes (Details) - Recourse Debt - USD ($) $ in Millions | Dec. 07, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Senior Notes due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of senior notes | $ 870 |  |  |  |
Interest rate, stated percentage | 5.75% | 5.75% | 5.75% | 5.75% |
Senior Notes, due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 6.625% |  |  |  | 6.625%

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