Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 9,384	$ 8,844
Amortized cost of available for sale securities	109,627	116,336
Available for sale securities, assets pledged	101,086	107,646
Held to maturity securities, assets pledged	$ 156,371	$ 159,452
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 9,329	$ 9,329
Treasury stock (in shares)	247,203,220	250,678,452
Common Stock
Common stock, shares authorized (in shares)	3,000,000,000	3,000,000,000
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	2,023,295,180	2,023,295,180
Nonvoting Common Stock
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	50,893,695	50,893,695
Asset Pledged as Collateral
Available for sale securities, assets pledged	$ 1,688	$ 1,733
Held to maturity securities, assets pledged	$ 6,745	$ 3,703