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Pledged Assets Repurchase Agreements with Counterparties Greater than or Equal to 5% of Equity at Risk (Details)
$ in Millions
Jun. 30, 2021
USD ($)
days
Dec. 31, 2020
USD ($)
days
Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Line Items]    
Securities Sold under Agreements to Repurchase | $ $ 48,737 $ 52,366
Risk Of Repurchase Agreement To Stockholders Equity 2.00%  
Weighted Average Days to Maturity | days 54 54
FICC [Member]    
Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Line Items]    
Risk Of Repurchase Agreement To Stockholders Equity 8.00%