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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Cash and cash equivalents	$ 2,627	$ 4,292	$ 3,101
Cash segregated for regulatory purposes	21,204	15,903	$ 14,272
Securities - segregated for regulatory purposes	25,069	27,821
Securities borrowed	5,708	4,956
Securities purchased under agreements to resell	1,692	792
Receivables from customer	42,645	39,333
Receivables from brokers, dealers and clearing organizations	3,368	1,254
Interest Receivable	116	104
Other assets	695	594
Short-term borrowings	212	118
Securities loaned	11,867	9,838
Customers	81,204	75,882
Brokers, dealers and clearing organizations	310	182
Interest Payable	13	6
at Fair Value
Cash and cash equivalents	2,627	4,292
Cash segregated for regulatory purposes	21,204	15,903
Securities - segregated for regulatory purposes	21,144	23,071
Securities borrowed	5,708	4,956
Securities purchased under agreements to resell	1,692	792
Receivables from customer	42,645	39,333
Receivables from brokers, dealers and clearing organizations	3,368	1,254
Interest Receivable	116	104
Other assets	13	13
Total financial assets, not measured at fair value	98,517	89,718
Short-term borrowings	212	118
Securities loaned	11,867	9,838
Customers	81,204	75,882
Brokers, dealers and clearing organizations	310	182
Interest Payable	13	6
Total financial liabilities, not measured at fair value	93,606	86,026
Carrying Value
Cash and cash equivalents	2,627	4,292
Cash segregated for regulatory purposes	21,204	15,903
Securities - segregated for regulatory purposes	21,144	23,071
Securities borrowed	5,708	4,956
Securities purchased under agreements to resell	1,692	792
Receivables from customer	42,645	39,333
Receivables from brokers, dealers and clearing organizations	3,368	1,254
Interest Receivable	116	104
Other assets	13	13
Total financial assets, not measured at fair value	98,517	89,718
Short-term borrowings	212	118
Securities loaned	11,867	9,838
Customers	81,204	75,882
Brokers, dealers and clearing organizations	310	182
Interest Payable	13	6
Total financial liabilities, not measured at fair value	93,606	86,026
Level 1 [Member]
Cash and cash equivalents	2,627	4,292
Cash segregated for regulatory purposes	21,204	15,903
Total financial assets, not measured at fair value	23,831	20,195
Short-term borrowings
Securities loaned
Customers
Brokers, dealers and clearing organizations
Interest Payable
Total financial liabilities, not measured at fair value
Level 2 [Member]
Securities - segregated for regulatory purposes	21,144	23,071
Securities borrowed	5,708	4,956
Securities purchased under agreements to resell	1,692	792
Receivables from customer	42,645	39,333
Receivables from brokers, dealers and clearing organizations	3,368	1,254
Interest Receivable	116	104
Other assets	2	2
Total financial assets, not measured at fair value	74,675	69,512
Short-term borrowings	212	118
Securities loaned	11,867	9,838
Customers	81,204	75,882
Brokers, dealers and clearing organizations	310	182
Interest Payable	13	6
Total financial liabilities, not measured at fair value	93,606	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 customer
Receivables from brokers, dealers and clearing organizations
Interest Receivable
Other assets	11	11
Total financial assets, not measured at fair value	11	11
Short-term borrowings
Securities loaned
Customers
Brokers, dealers and clearing organizations
Interest Payable
Total financial liabilities, not measured at fair value

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