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Cash and Investments Segregated and on Deposit for Regulatory Purposes
 3 Months Ended
Dec. 31, 2019
Restricted Cash and Investments [Abstract]  
Cash and Investments Segregated and on Deposit for Regulatory Purposes Cash and Investments Segregated and on Deposit for Regulatory Purposes
Cash and investments segregated and on deposit for regulatory purposes consists of the following (dollars in millions):
 
 
December 31,
2019
 
September 30,
2019
U.S. government debt securities
 
$
3,747

 
$
4,369

Cash in demand deposit accounts
 
2,300

 
2,304

U.S. government agency mortgage-backed securities
 
1,771

 
1,318

Reverse repurchase agreements (collateralized by U.S. government debt securities)
 
500

 
500

Cash on deposit with futures commission merchants
 
193

 
168

U.S. government debt securities on deposit with futures commission merchant
 
25

 
25

Total
 
$
8,536

 
$
8,684