Long-Term Debt - Narrative (Details) - USD ($)		2 Months Ended	12 Months Ended
	Dec. 15, 2022	Aug. 02, 2023	May 31, 2023	May 31, 2022
Debt Instrument [Line Items]
Long-term debt			$ 23,946,548,000	$ 21,545,440,000
Debt, weighted average interest rate			6.64%	5.11%
Debt | Credit availability concentration risk | Long-term debt
Debt Instrument [Line Items]
Concentration percentage			77.00%	75.00%
Fixed rate debt | Long-term debt | Credit availability concentration risk
Debt Instrument [Line Items]
Concentration percentage			93.00%	90.00%
Variable rate debt | Long-term debt | Credit availability concentration risk
Debt Instrument [Line Items]
Concentration percentage			7.00%	10.00%
Guaranteed Underwriter Program notes payable
Debt Instrument [Line Items]
Unused borrowing capacity, amount			$ 1,025,000,000
Maximum percentage of patronage capital distribution allowed			5.00%
Guaranteed Underwriter Program notes payable | Committed loan facility
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 800,000,000
Repayments of notes payable			185,000,000
Guaranteed Underwriter Program notes payable | Committed Loan Facility, Series T
Debt Instrument [Line Items]
Term of debt	30 years
Debt Instrument maximum borrowing capacity	$ 750,000,000
Secured long-term debt
Debt Instrument [Line Items]
Long-term debt			$ 17,449,610,000	$ 16,051,388,000
Long term debt, percentage			73.00%	75.00%
Collateral trust bonds
Debt Instrument [Line Items]
Long-term debt			$ 7,577,973,000	$ 6,848,490,000
Term of debt			10 years
Proceeds from issuance of long-term debt			$ 1,050,000,000
Debt, weighted average interest rate			5.17%
Unsecured long-term debt
Debt Instrument [Line Items]
Long-term debt			$ 6,496,938,000	$ 5,494,052,000
Long term debt, percentage			27.00%	25.00%
Debt instrument, increase (decrease)			$ 1,003,000,000
Medium-term notes | Medium-term Notes 4.87%
Debt Instrument [Line Items]
Term of debt			4 years
Proceeds from issuance of long-term debt			$ 1,700,000,000
Debt, weighted average interest rate			4.87%
Medium-term notes | Medium-term Notes 5.05% | Subsequent event
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		$ 400,000,000
Debt instrument, fixed interest rate		5.05%
Federal Agricultural Mortgage Corporation | Farmer Mac notes payable
Debt Instrument [Line Items]
Proceeds from short-term note			$ 500,000,000
Repayments of short-term debt			500,000,000
Federal Agricultural Mortgage Corporation | Revolving credit agreements | Farmer Mac notes payable
Debt Instrument [Line Items]
Long-term debt			3,150,000,000
Unused borrowing capacity, amount			2,850,000,000
Debt Instrument maximum borrowing capacity			$ 6,000,000,000
Debt instrument, renewal term			1 year
Debt instrument, termination written notice, term			425 days
Proceeds from notes payable			$ 550,000,000