Derivative Instruments and Hedging Activities - Rating Triggers (Details) - Interest rate swaps $ in Thousands	Nov. 30, 2021 USD ($)
Derivative [Line Items]
Notional Amount	$ 6,073,479
Payable Due from CFC	(381,463)
Receivable Due to CFC	0
Net Payable	(381,463)
Moody's, A3 Rating Standard Poor's A- Rating
Derivative [Line Items]
Notional Amount	38,205
Payable Due from CFC	(6,748)
Receivable Due to CFC	0
Net Payable	(6,748)
Moodys Baa 1 Rating Standard Poor's BBB Plus Rating
Derivative [Line Items]
Notional Amount	5,636,404
Payable Due from CFC	(357,913)
Receivable Due to CFC	0
Net Payable	(357,913)
Moody's Baa 2 Rating Standard Poor's BBB Rating
Derivative [Line Items]
Notional Amount	398,870
Payable Due from CFC	(16,802)
Receivable Due to CFC	0
Net Payable	$ (16,802)