Contracts with Customers (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Allowance for credit loss	$ 189	$ 191
Loyalty Program
Disaggregation of Revenue [Line Items]
Increase (decrease) in deferred revenue	200
Contract with customer liability	6,794	6,594
Reclassification of deferred revenue to liability for guest loyalty program	91
Deferred revenue recognized	2,325
Deferred revenue
Disaggregation of Revenue [Line Items]
Increase (decrease) in deferred revenue	(113)
Contract with customer liability	1,218	$ 1,331
Deferred revenue recognized	$ 213