Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Derivative Instruments Having Rating Triggers (Details) - Interest Rate Swap with Rating Trigger $ in Thousands	Feb. 28, 2026 USD ($)
Derivative [Line Items]
Notional Amount	$ 4,284,456
Payable Due from CFC	(1,653)
Receivable Due to CFC	258,886
Net Receivable (Payable)	257,233
Falls below A3/A-
Derivative [Line Items]
Notional Amount	14,000
Payable Due from CFC	(561)
Receivable Due to CFC	0
Net Receivable (Payable)	(561)
Falls below Baa1/BBB+
Derivative [Line Items]
Notional Amount	4,002,148
Payable Due from CFC	(1,092)
Receivable Due to CFC	241,925
Net Receivable (Payable)	240,833
Falls to or below Baa2/BBB
Derivative [Line Items]
Notional Amount	268,308
Payable Due from CFC	0
Receivable Due to CFC	16,961
Net Receivable (Payable)	$ 16,961