Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Agreement Contract	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments and Contingencies [Line Items]
Current liabilities	$ 2,684	$ 2,443
Guarantees for debt and other obligations of third parties [member]
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 5
Guarantor obligations, term	seven years
Number of letters of credit pledged as collateral	1
Letters of credit outstanding, amount	$ 25
Number of guarantees with pledged collateral | Agreement	1
Management contract performance guarantees [member]
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 69
Guarantor obligations, term	2019 to 2030
Number of contracts with performance guarantees | Contract	7
Current liabilities	$ 11	8
Non-current liabilities	17	25
Commitments for capital expenditures [Member]
Commitments and Contingencies [Line Items]
Purchase commitment, remaining minimum amount committed	43
Loan commitment [member]
Commitments and Contingencies [Line Items]
Long-term purchase commitment, amount	60
Commitment payments year to date	34	17
2017 fund commitment	9
Timeshare inventory purchase commitment [member]
Commitments and Contingencies [Line Items]
Long-term purchase commitment, amount	193
Commitment payments year to date	$ 18	$ 17	$ 29
Long-term purchase commitment, time period	3 years
2017 contractual obligation	$ 8
2018 contractual obligation	56
2019 contractual obligation	$ 129