Commitments and Contingencies - Guarantees (Details) $ in Millions	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 256
Recorded Liability for Guarantees	114
Guarantees not in effect until underlying properties open	47
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	192
Recorded Liability for Guarantees	105
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	11
Recorded Liability for Guarantees	$ 3