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Condensed Consolidating Financial Information - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amount outstanding	$ 7,436	$ 9,494
Recourse Debt
Debt Instrument [Line Items]
Amount outstanding	7,167	$ 7,182
Senior Notes | Recourse Debt
Debt Instrument [Line Items]
Amount outstanding	$ 4,800

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-Section S99
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 210
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