CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 89,554	$ 88,063
Allowance for credit losses	3	4
Loans held for sale	$ 394	$ 347
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	4,975,000	4,975,000
Preferred stock, shares outstanding (in shares)	4,975,000	4,975,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	700,703,094	696,242,668
Common stock, shares outstanding (in shares)	381,856,146	380,389,609
Treasury stock, shares (in shares)	318,846,948	315,853,059
Treasury stock, par value (in dollars per share)	$ 0.01	$ 0.01