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Receivables from and Payables to Brokerage Clients (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Margin loans, net of allowance for credit losses $ 60,865 $ 19,474
Other brokerage receivables 3,575 2,293
Receivables from brokerage clients — net [1] 64,440 21,767
Payables    
Interest-bearing payables 84,642 29,009
Non-interest-bearing payables 19,559 10,211
Payables to brokerage clients [1] $ 104,201 $ 39,220
California [Member] | Geographic Concentration Risk [Member] | Contract with Customer [Member]    
Concentration Risk [Line Items]    
Percent of client accounts 17.00% 22.00%
California [Member] | Geographic Concentration Risk [Member] | Contract with Customer [Member] | TD Ameritrade [Member]    
Concentration Risk [Line Items]    
Percent of client accounts 17.00%  
[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.