Commitments and Contingencies - Guarantees (Details) $ in Millions	Sep. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 254
Recorded Liability for Guarantees	117
Guarantees not in effect until underlying properties open	79
Debt service
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	53
Recorded Liability for Guarantees	6
Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	183
Recorded Liability for Guarantees	107
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	18
Recorded Liability for Guarantees	$ 4