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Unsecured senior notes payable, LOC, and commercial paper (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 22, 2024	Feb. 29, 2024	Dec. 31, 2023	Jun. 30, 2024	Sep. 30, 2023	Sep. 22, 2022
Debt Instrument
Principal				$ 12,510,267
Debt Balance at 100%				$ 12,424,055
Commercial Paper
Debt Instrument
Weighted Average Interest Rate				5.57%
Principal				$ 199,600
Commercial paper, maximum issuance				$ 2,500,000
Weighted-average yield to maturity, commercial paper				5.59%
Weighted-average remaining maturity term, commercial paper				16 days
Commercial Paper \| Minimum
Debt Instrument
Debt Instrument, Term				30 days
Commercial Paper \| Maximum
Debt Instrument
Debt Instrument, Term				397 days
Total issuance of unsecured senior notes in Feb 2024
Debt Instrument
Total issuance of unsecured senior notes		$ 1,000,000
Weighted Average Interest Rate		5.48%
Weighted average maturity years		23 years 1 month 6 days
5.25% Unsecured Senior Notes Payable
Debt Instrument
Principal		$ 400,000		$ 400,000
Stated interest rate (as a percent)		5.25%		5.25%
Debt Balance at 100%				$ 395,720
Maturity Date				May 15, 2036
5.625% Unsecured Senior Notes Payable
Debt Instrument
Principal		$ 600,000		$ 600,000
Stated interest rate (as a percent)		5.625%		5.625%
Debt Balance at 100%				$ 593,199
Maturity Date				May 15, 2054
Unsecured senior line of credit
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity				$ 5,000,000
Applicable margin (as a percent)				0.855%	0.875%
Annual facility fee (as a percent)				0.145%	0.15%
Interest rate adjustment amount, maximum						0.04%
Facility fee rate adjustment amount, maximum						0.01%
Interest rate adjustment amount, decrease			0.02%
Facility fee rate adjustment amount, decrease			0.005%
Debt Balance at 100%				$ 0
Unsecured senior line of credit \| Commercial Paper
Debt Instrument
Principal				200,000
Debt Balance at 100%				$ 199,552
Maturity Date				Jan. 22, 2028
Unsecured senior line of credit \| Commercial Paper \| Subsequent Event
Debt Instrument
Maturity Date	Jan. 22, 2030