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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 81,569 $ 62,689
Agreements to resell [1] 31,314 33,208
Customer margin assets 53,978 42,222
Total collateralized transactions 166,861 138,119
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 7,671 7,055
Agreements to resell [1] 29,895 31,108
Customer margin assets 17,085 17,008
Total collateralized transactions $ 54,651 $ 55,171
[1]

September 30, 2023

December 31, 2022

Permitted

Sold or

Permitted

Sold or

to Repledge

Repledged

to Repledge

Repledged

(in millions)

Securities lending transactions

$

81,569

$

7,671

$

62,689

$

7,055

Securities purchased under agreements to resell transactions 1

31,314

29,895

33,208

31,108

Customer margin assets

53,978

17,085

42,222

17,008

$

166,861

$

54,651

$

138,119

$

55,171

______________________________

(1)As of September 30, 2023, $25.6 billion or 86% (as of December 31, 2022, $27.1 billion or 87%) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements.