Investment Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Accrued interest receivables on investment securities	$ 150		$ 150		$ 131
Impairment losses	1	$ 0	5	$ 0
Securities with a fair value, pledged as collateral	23,800		23,800		11,000
Unrealized losses	7,668		7,668		6,046
Non-rated Securities
Summary of Investment Holdings [Line Items]
Unrealized losses	$ 46		$ 46		$ 42