NOTES PAYABLE - Callable Medium-Term Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total principal net of discounts	$ 35,676,179	$ 30,815,880
Weighted-Average Rate	3.75%
Year one
Debt Instrument [Line Items]
Weighted-Average Rate	3.65%
Year two
Debt Instrument [Line Items]
Weighted-Average Rate	3.95%
Year three
Debt Instrument [Line Items]
Weighted-Average Rate	4.06%
Year four
Debt Instrument [Line Items]
Weighted-Average Rate	3.69%
Call Option
Debt Instrument [Line Items]
2027	$ 998,842
2028	660,824
2029	800,092
2030	813,532
Thereafter	1,051,442
Total principal net of discounts	$ 4,324,732
Weighted-Average Rate	3.30%
Call Option | Year one
Debt Instrument [Line Items]
Weighted-Average Rate	2.87%
Call Option | Year two
Debt Instrument [Line Items]
Weighted-Average Rate	3.81%
Call Option | Year three
Debt Instrument [Line Items]
Weighted-Average Rate	4.25%
Call Option | Year four
Debt Instrument [Line Items]
Weighted-Average Rate	3.11%
Call Option | Thereafter
Debt Instrument [Line Items]
Weighted-Average Rate	2.80%