Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 2,258	$ 2,096
Common stock par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01