Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 13,644	$ 13,096
Amortized cost of available for sale securities	$ 264,816	$ 391,482
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 10,450	$ 10,100
Treasury stock (in shares)	198,092,107	180,959,274
Common Stock [Member]
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	1,994,895,180
Nonvoting Common Stock [Member]
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	79,293,695