Commitments and Contingencies - Guarantees (Details) $ in Millions	Mar. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 292
Recorded Liability for Guarantees	162
Guarantees not in effect until underlying properties open	76
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	225
Recorded Liability for Guarantees	153
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	14
Recorded Liability for Guarantees	$ 3