CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 1,144	$ 1,161
Loans held for sale, fair value	$ 87	$ 68
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	16,750	26,750
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, authorized (in shares)	700,000,000	700,000,000
Common stock, issued (in shares)	532,180,686	558,838,694