NOTES PAYABLE - Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Due within one year:
Outstanding, Amount	$ 11,271,682	$ 10,437,623
Outstanding, Weighted - average rate	3.34%	3.77%
Medium-term notes due in:
Two years	$ 6,641,397
Three years	3,740,471
Four years	2,836,656
Five years	3,889,804
Thereafter	2,435,870
Total due after one year	19,544,198
Total principal net of discounts	30,815,880	$ 27,520,173
Hedging adjustments	6,690	(148,999)
Total	$ 30,822,570	27,371,174
Weighted - average rate	3.58%
Total weighted - average rate	3.58%
Two years
Medium-term notes due in:
Weighted - average rate	3.65%
Three years
Medium-term notes due in:
Weighted - average rate	3.97%
Four years
Medium-term notes due in:
Weighted - average rate	4.24%
Five years
Medium-term notes due in:
Weighted - average rate	3.71%
Thereafter
Medium-term notes due in:
Weighted - average rate	2.88%
Total due after one year
Medium-term notes due in:
Weighted - average rate	3.71%
Discount notes
Due within one year:
Outstanding, Amount	$ 2,614,571	$ 2,167,258
Outstanding, Weighted - average rate	3.87%	4.42%
Average Outstanding, Amount	$ 1,854,488	$ 1,928,884
Average Outstanding, Weighted - average rate (as a percent)	4.22%	5.11%
Medium-term notes
Due within one year:
Outstanding, Amount	$ 2,822,454	$ 2,343,264
Outstanding, Weighted - average rate	4.02%	4.64%
Average Outstanding, Amount	$ 2,901,863	$ 1,000,290
Average Outstanding, Weighted - average rate (as a percent)	4.35%	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
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%
Medium-term notes | Total due after one year
Medium-term notes due in:
Weighted - average rate		3.34%
Current portion of medium-term notes
Due within one year:
Outstanding, Amount	$ 5,834,657	$ 5,927,101
Outstanding, Weighted - average rate	2.77%	3.20%