Investment Securities Additional Information (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivable	$ 241	$ 215
Proceeds from sales			$ 0	$ 330	$ 0	$ 2,570
Debt Securities, Available-for-sale, Realized Gain (Loss)			0	$ (3)	0	$ (9)
Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value	44,100	21,300	44,100		44,100
Securities Received as Collateral	$ 72	$ 82	$ 72		$ 72