Debt & Non-recourse Debt - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs	$ 8	$ 8
Restricted cash	69	51
Reserves related to non-recourse debt
Debt Instrument [Line Items]
Restricted cash	$ 25	22
Timeshare Facility with an average rate of 2.884%, due 2020
Debt Instrument [Line Items]
Extended commitment termination date	2020-03
Timeshare Facility with an average rate of 2.884%, due 2020 \| Other Assets
Debt Instrument [Line Items]
Debt issuance costs	$ 2
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount	1	1
Debt issuance costs	$ 1	$ 2

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

+ References

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