NOTES PAYABLE - Borrowings (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Due within one year:
Outstanding, Amount	$ 10,108,227	$ 10,437,623
Outstanding, Weighted - average rate	3.59%	3.77%
Medium-term notes due in:
Two years	$ 5,703,854
Three years	3,420,124
Four years	2,957,557
Five years	2,845,939
Thereafter	3,014,065
Total due after one year	17,941,539
Total principal net of discounts	28,049,766	$ 27,520,173
Hedging adjustments	(74,570)	(148,999)
Total	$ 27,975,196	27,371,174
Weighted - average rate	3.52%
Total weighted - average rate	3.55%
Two years
Medium-term notes due in:
Weighted - average rate	3.05%
Three years
Medium-term notes due in:
Weighted - average rate	3.83%
Four years
Medium-term notes due in:
Weighted - average rate	4.20%
Five years
Medium-term notes due in:
Weighted - average rate	4.31%
Thereafter
Medium-term notes due in:
Weighted - average rate	2.67%
Discount notes
Due within one year:
Outstanding, Amount	$ 1,874,562	$ 2,167,258
Outstanding, Weighted - average rate	4.24%	4.42%
Average Outstanding, Amount	$ 2,015,154	$ 1,928,884
Average Outstanding, Weighted - average rate (as a percent)	4.32%	5.11%
Medium-term notes
Due within one year:
Outstanding, Amount	$ 2,813,359	$ 2,343,264
Outstanding, Weighted - average rate	4.45%	4.64%
Average Outstanding, Amount	$ 2,339,633	$ 1,000,290
Average Outstanding, Weighted - average rate (as a percent)	5.37%	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	$ 5,420,306	$ 5,927,101
Outstanding, Weighted - average rate	2.91%	3.20%