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Contingencies (Details)
$ in Millions
1 Months Ended
May 06, 2021
claim
Jul. 31, 2021
USD ($)
investment
Sep. 30, 2023
USD ($)
claim
Loss Contingencies [Line Items]      
Number of existing legal claims or proceedings that are likely to have a material effect on the Company's business | claim     0
Maximum [Member]      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss | $     $ 15
Education [Member]      
Loss Contingencies [Line Items]      
Claims received | investment   1,449  
Loss Contingency Borrower Defense Claims Discharge Loan Amount | $   $ 35  
Education [Member] | Minimum [Member]      
Loss Contingencies [Line Items]      
Potential claims Per ED | claim 800