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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 69,582 $ 64,436
Agreements to resell [1] 14,715 23,859
Customer margin assets 65,899 47,609
Total collateralized transactions 150,196 135,904
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 6,192 4,859
Agreements to resell [1] 13,956 23,832
Customer margin assets 15,936 14,182
Total collateralized transactions $ 36,084 $ 42,873
[1] As of December 31, 2021, $10.4 billion or 74% (as of December 31, 2020, $23.1 billion or 97%) of securities acquired through agreements to resell that are shown as repledged have been deposited in a separate bank account for the exclusive benefit of customers in accordance with SEC Rule 15c3-3.