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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	12 Months Ended
	Feb. 29, 2024	Sep. 30, 2024	Mar. 31, 2024	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 22, 2022
Debt Instrument
Principal		$ 12,775,114			$ 12,775,114
Debt Balance at 100%		$ 12,691,601			$ 12,691,601
Commercial Paper
Debt Instrument
Weighted Average Interest Rate		5.05%			5.05%
Principal		$ 454,600			$ 454,600
Commercial paper, maximum issuance		2,500,000			$ 2,500,000
Weighted-average yield to maturity, commercial paper					5.55%
Weighted-average remaining maturity term, commercial paper					17 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			$ 400,000
Stated interest rate (as a percent)	5.25%	5.25%			5.25%
Debt Balance at 100%		$ 395,805			$ 395,805
Maturity Date					May 15, 2036
5.625% Unsecured Senior Notes Payable
Debt Instrument
Principal	$ 600,000	$ 600,000			$ 600,000
Stated interest rate (as a percent)	5.625%	5.625%			5.625%
Debt Balance at 100%		$ 593,255			$ 593,255
Maturity Date					May 15, 2054
Unsecured senior line of credit
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity		5,000,000			$ 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			$ 0
Unsecured senior line of credit | Commercial Paper
Debt Instrument
Principal		455,000			455,000
Debt Balance at 100%		$ 454,589			$ 454,589
Maturity Date		Jan. 22, 2030		Jan. 22, 2028	Jan. 22, 2030

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