NOTES PAYABLE - Borrowings (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Due within one year:
Outstanding, Amount	$ 10,283,707	$ 10,437,623
Outstanding, Weighted - average rate	3.55%	3.77%
Medium-term notes due in:
Two years	$ 6,235,077
Three years	3,464,128
Four years	2,953,903
Five years	3,036,068
Thereafter	2,904,357
Total due after one year	18,593,533
Total principal net of discounts	28,877,240	$ 27,520,173
Hedging adjustments	(33,909)	(148,999)
Total	$ 28,843,331	27,371,174
Weighted - average rate	3.60%
Total weighted - average rate	3.58%
Two years
Medium-term notes due in:
Weighted - average rate	3.25%
Three years
Medium-term notes due in:
Weighted - average rate	3.85%
Four years
Medium-term notes due in:
Weighted - average rate	4.33%
Five years
Medium-term notes due in:
Weighted - average rate	4.15%
Thereafter
Medium-term notes due in:
Weighted - average rate	2.75%
Discount notes
Due within one year:
Outstanding, Amount	$ 1,972,497	$ 2,167,258
Outstanding, Weighted - average rate	4.13%	4.42%
Average Outstanding, Amount	$ 1,796,150	$ 1,928,884
Average Outstanding, Weighted - average rate (as a percent)	4.29%	5.11%
Medium-term notes
Due within one year:
Outstanding, Amount	$ 3,260,919	$ 2,343,264
Outstanding, Weighted - average rate	4.33%	4.64%
Average Outstanding, Amount	$ 2,990,808	$ 1,000,290
Average Outstanding, Weighted - average rate (as a percent)	4.41%	5.28%
Medium-term notes due in:
Two years		$ 4,844,538
Three years		3,822,999
Four years		2,732,980
Five years		2,491,831
Thereafter		3,190,202
Total due after one year		$ 17,082,550
Weighted - average rate		3.34%
Total weighted - average rate		3.51%
Medium-term notes | Two years
Medium-term notes due in:
Weighted - average rate		2.66%
Medium-term notes | Three years
Medium-term notes due in:
Weighted - average rate		3.53%
Medium-term notes | Four years
Medium-term notes due in:
Weighted - average rate		4.13%
Medium-term notes | Five years
Medium-term notes due in:
Weighted - average rate		4.41%
Medium-term notes | Thereafter
Medium-term notes due in:
Weighted - average rate		2.63%
Current portion of medium-term notes
Due within one year:
Outstanding, Amount	$ 5,050,291	$ 5,927,101
Outstanding, Weighted - average rate	2.82%	3.20%