Investment Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Accrued interest receivables on investment securities	$ 131		$ 131		$ 131
Impairment losses	4	$ 0	4	$ 0
Securities with a fair value, pledged as collateral	22,900		22,900		11,000
Unrealized losses	6,076		6,076		6,046
Non-rated Securities
Summary of Investment Holdings [Line Items]
Unrealized losses	$ 41		$ 41		$ 42