Debt & Non-recourse debt - Schedule of Outstanding Borrowings (Parenthetical) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt instrument, average interest rate	5.092%	4.851%
Less: unamortized deferred financing costs and discount	$ (9)	$ (10)
Revolving Credit Facility
Debt Instrument [Line Items]
Less: unamortized deferred financing costs and discount	$ (2)	$ (2)
Line of Credit \| Term loan with an average rate of 3.47%, due 2021
Debt Instrument [Line Items]
Debt instrument, average interest rate	3.48%	3.48%
Debt instrument, maturity year	2021	2021
Less: unamortized deferred financing costs and discount	$ (2)	$ (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	$ (7)	$ (8)
Unsecured Debt \| 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	2.453%	1.946%
Less: unamortized deferred financing costs and discount	$ (6)	$ (2)
Non-recourse Debt \| Timeshare Facility with an average rate of 2.36%, due 2019
Debt Instrument [Line Items]
Debt instrument, average interest rate	2.54%	2.54%
Debt instrument, maturity year	2019	2019
Less: unamortized deferred financing costs and discount	$ (2)	$ (3)
Non-recourse Debt \| Securitized Debt with an average rate of 2.42%, due 2028
Debt Instrument [Line Items]
Debt instrument, average interest rate	2.43%	2.43%
Debt instrument, maturity year	2028	2028

Debt instrument maturity year.

No definition available.

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- Definition

The average effective interest rate during the reporting period.

+ 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=64930785&loc=d3e28551-108399

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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Period Type:	duration

- Definition

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

+ References

Reference 1: 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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- 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.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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

+ Details

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- Details

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- Details

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- Details

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- Details

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