Commitments and Contingencies - Guarantees (Details) $ in Millions	Jun. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 315
Recorded Liability for Guarantees	104
Guarantees not in effect until underlying properties open	46
Debt service
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	109
Recorded Liability for Guarantees	11
Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	198
Recorded Liability for Guarantees	92
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	8
Recorded Liability for Guarantees	$ 1