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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
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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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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