Debt & Non-recourse Debt - Schedule of Outstanding Borrowings (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, average interest rate	4.891%	5.17%
Less: unamortized deferred financing costs and discount	$ (8)	$ (8)
Revolving Credit Facility
Debt Instrument [Line Items]
Less: unamortized deferred financing costs and discount	$ (6)	$ (6)
Revolving Credit Facility \| Revolver with an average rate of 3.995%, due 2023
Debt Instrument [Line Items]
Debt instrument, average interest rate	3.995%	3.995%
Debt instrument, maturity year	2023	2023
Line of Credit \| Term loans with an average rate of 3.995%, due 2023
Debt Instrument [Line Items]
Debt instrument, average interest rate	3.995%	3.995%
Debt instrument, maturity year	2023	2023
Less: unamortized deferred financing costs and discount	$ (2)
Line of Credit \| Senior notes with a rate of 6.125%, due 2024
Debt Instrument [Line Items]
Less: unamortized deferred financing costs and discount		$ (6)
Senior Notes \| Senior notes with a rate of 6.125%, due 2024
Debt Instrument [Line Items]
Debt instrument, maturity year	2024	2024
Debt instrument, stated interest rate	6.125%	6.125%
Non-recourse Debt
Debt Instrument [Line Items]
Debt instrument, average interest rate	3.166%	3.126%
Less: unamortized deferred financing costs and discount	$ (6)	$ (7)
Non-recourse Debt \| Timeshare Facility with an average rate of 3.688%, due 2021
Debt Instrument [Line Items]
Debt instrument, maturity year	2021	2021
Debt instrument, stated interest rate	3.688%	3.688%
Less: unamortized deferred financing costs and discount	$ (2)	$ (3)
Non-recourse Debt \| Securitized Debt with a rate of 2.280%, due 2026
Debt Instrument [Line Items]
Debt instrument, average interest rate	2.28%	2.28%
Debt instrument, maturity year	2026	2026
Non-recourse Debt \| Securitized Debt with an average rate of 1.810%, due 2026
Debt Instrument [Line Items]
Debt instrument, average interest rate	1.81%	1.81%
Debt instrument, maturity year	2026	2026
Non-recourse Debt \| Securitized Debt with an average rate of 2.711%, due 2028
Debt Instrument [Line Items]
Debt instrument, average interest rate	2.711%	2.711%
Debt instrument, maturity year	2028	2028
Non-recourse Debt \| Securitized Debt with an average rate of 3.602%, due 2032
Debt Instrument [Line Items]
Debt instrument, average interest rate	3.602%	3.602%
Debt instrument, maturity year	2032	2032

Debt instrument maturity year.

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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

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- Definition

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 accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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