Related Party Transactions - Summary of Loans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
HMUS
Related Party Transaction [Line Items]
Loans receivable from related parties	$ 1,576	$ 1,088
HNAH
Related Party Transaction [Line Items]
Loans receivable from related parties	1,000	0
Other short-term affiliate lending [Member]
Related Party Transaction [Line Items]
Loans receivable from related parties	217	12
Affiliated Entity
Related Party Transaction [Line Items]
Loans receivable from related parties	$ 2,793	$ 1,100