Related Party Transactions - Summary of Loans (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Affiliated Entity
Related Party Transaction [Line Items]
Loans receivable from related parties	$ 3,438	$ 2,793
HMUS
Related Party Transaction [Line Items]
Loans receivable from related parties	2,413	1,576
HNAH
Related Party Transaction [Line Items]
Loans receivable from related parties	1,000	1,000
Other short-term affiliate lending
Related Party Transaction [Line Items]
Loans receivable from related parties	$ 25	$ 217