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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Cash and cash equivalents	$ 2,838	$ 4,292	$ 3,292
Cash segregated for regulatory purposes	23,125	15,903	$ 12,789
Securities - segregated for regulatory purposes	14,400	27,821
Securities borrowed	3,811	4,956
Securities purchased under agreements to resell	6,108	792
Receivables from customers	50,503	39,333
Receivables from brokers, dealers and clearing organizations	4,038	1,254
Interest Receivable	113	104
Other assets	687	594
Short-term borrowings	28	118
Securities loaned	10,535	9,838
Payable to customers	84,087	75,882
Brokers, dealers and clearing organizations	781	182
Interest Payable	10	6
at Fair Value
Cash and cash equivalents	2,838	4,292
Cash segregated for regulatory purposes	23,125	15,903
Securities - segregated for regulatory purposes	10,475	23,071
Securities borrowed	3,811	4,956
Securities purchased under agreements to resell	6,108	792
Receivables from customers	50,503	39,333
Receivables from brokers, dealers and clearing organizations	4,038	1,254
Interest Receivable	113	104
Other assets	19	13
Total financial assets, not measured at fair value	101,030	89,718
Short-term borrowings	28	118
Securities loaned	10,535	9,838
Payable to customers	84,087	75,882
Brokers, dealers and clearing organizations	781	182
Interest Payable	10	6
Total financial liabilities, not measured at fair value	95,441	86,026
Carrying Value
Cash and cash equivalents	2,838	4,292
Cash segregated for regulatory purposes	23,125	15,903
Securities - segregated for regulatory purposes	10,475	23,071
Securities borrowed	3,811	4,956
Securities purchased under agreements to resell	6,108	792
Receivables from customers	50,503	39,333
Receivables from brokers, dealers and clearing organizations	4,038	1,254
Interest Receivable	113	104
Other assets	19	13
Total financial assets, not measured at fair value	101,030	89,718
Short-term borrowings	28	118
Securities loaned	10,535	9,838
Payable to customers	84,087	75,882
Brokers, dealers and clearing organizations	781	182
Interest Payable	10	6
Total financial liabilities, not measured at fair value	95,441	86,026
Level 1 [Member]
Cash and cash equivalents	2,838	4,292
Cash segregated for regulatory purposes	23,125	15,903
Total financial assets, not measured at fair value	25,963	20,195
Short-term borrowings
Securities loaned
Payable to customers
Brokers, dealers and clearing organizations
Interest Payable
Total financial liabilities, not measured at fair value
Level 2 [Member]
Securities - segregated for regulatory purposes	10,475	23,071
Securities borrowed	3,811	4,956
Securities purchased under agreements to resell	6,108	792
Receivables from customers	50,503	39,333
Receivables from brokers, dealers and clearing organizations	4,038	1,254
Interest Receivable	113	104
Other assets	2	2
Total financial assets, not measured at fair value	75,050	69,512
Short-term borrowings	28	118
Securities loaned	10,535	9,838
Payable to customers	84,087	75,882
Brokers, dealers and clearing organizations	781	182
Interest Payable	10	6
Total financial liabilities, not measured at fair value	95,441	86,026
Level 3 [Member]
Cash and cash equivalents
Cash segregated for regulatory purposes
Securities - segregated for regulatory purposes
Securities borrowed
Securities purchased under agreements to resell
Receivables from customers
Receivables from brokers, dealers and clearing organizations
Interest Receivable
Other assets	17	11
Total financial assets, not measured at fair value	17	11
Short-term borrowings
Securities loaned
Payable to customers
Brokers, dealers and clearing organizations
Interest Payable
Total financial liabilities, not measured at fair value

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