NOTES PAYABLE - Borrowings (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Due within one year:
Outstanding, Amount	$ 9,945,445	$ 8,087,168
Outstanding, Weighted - average rate	3.90%	3.52%
Medium-term notes due in:
Two years	$ 4,552,685
Three years	4,322,588
Four years	2,731,158
Five years	2,286,867
Thereafter	3,355,828
Total due after one year	17,249,126
Total principal net of discounts	27,194,571	$ 26,586,959
Hedging adjustments	(65,115)	(250,417)
Total	$ 27,129,456	26,336,542
Weighted - average rate	3.31%
Total weighted - average rate	3.53%
Two years
Medium-term notes due in:
Weighted - average rate	2.90%
Three years
Medium-term notes due in:
Weighted - average rate	3.09%
Four years
Medium-term notes due in:
Weighted - average rate	3.97%
Five years
Medium-term notes due in:
Weighted - average rate	4.62%
Thereafter
Medium-term notes due in:
Weighted - average rate	2.73%
Discount notes
Due within one year:
Outstanding, Amount	$ 2,209,572	$ 1,734,387
Outstanding, Weighted - average rate	4.82%	5.32%
Average Outstanding, Amount	$ 1,884,228	$ 1,097,300
Average Outstanding, Weighted - average rate (as a percent)	5.22%	5.08%
Medium-term notes
Due within one year:
Outstanding, Amount	$ 1,533,369	$ 384,970
Outstanding, Weighted - average rate	5.05%	5.07%
Average Outstanding, Amount	$ 625,746	$ 1,731,308
Average Outstanding, Weighted - average rate (as a percent)	5.28%	4.09%
Medium-term notes due in:
Two years		$ 5,523,671
Three years		3,825,702
Four years		3,038,229
Five years		2,623,202
Thereafter		3,488,987
Total due after one year		$ 18,499,791
Weighted - average rate		3.16%
Total weighted - average rate		3.27%
Medium-term notes | Two years
Medium-term notes due in:
Weighted - average rate		3.27%
Medium-term notes | Three years
Medium-term notes due in:
Weighted - average rate		2.27%
Medium-term notes | Four years
Medium-term notes due in:
Weighted - average rate		3.44%
Medium-term notes | Five years
Medium-term notes due in:
Weighted - average rate		4.37%
Medium-term notes | Thereafter
Medium-term notes due in:
Weighted - average rate		2.80%
Current portion of medium-term notes
Due within one year:
Outstanding, Amount	$ 6,202,504	$ 5,967,811
Outstanding, Weighted - average rate	3.29%	2.90%