Commitments and Contingencies - Guarantees (Details) $ in Millions	Mar. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 275
Recorded Liability for Guarantees	138
Guarantees not in effect until underlying properties open	93
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	204
Recorded Liability for Guarantees	128
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	18
Recorded Liability for Guarantees	$ 4