CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Securities held to maturity	$ 1,131	$ 1,161
Loans held-for-sale, at fair value	$ 84	$ 68
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	26,750	26,750
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares issued (in shares)	548,636,986	558,838,694