Notes Payable - General (Details)	1 Months Ended
	Jan. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 GBP (£)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)
5.050% Notes due January 2026 | Interest rate swaps
Debt
Length of swap contracts	3 years
Notes and bonds payable
Debt
Total principal amount		$ 17,417,897,000			$ 14,114,156,000
Unamortized net premiums, deferred financing costs and basis adjustment on interest rate swaps designated as fair value hedge		64,755,000			163,857,000
Net payable amount		$ 17,482,652,000			14,278,013,000
Notes and bonds payable | 4.600% Notes due 2024
Debt
Interest rate (as a percent)		4.60%	4.60%	4.60%
Principal (Currency Denomination)		$ 499,999,000
Total principal amount		$ 499,999,000			499,999,000
Notes and bonds payable | 3.875% Notes due 2024
Debt
Interest rate (as a percent)		3.875%	3.875%	3.875%
Principal (Currency Denomination)		$ 350,000,000
Total principal amount		$ 350,000,000			350,000,000
Notes and bonds payable | 3.875% Notes due 2025
Debt
Interest rate (as a percent)		3.875%	3.875%	3.875%
Principal (Currency Denomination)		$ 500,000,000
Total principal amount		$ 500,000,000			500,000,000
Notes and bonds payable | 4.625% Notes due 2025
Debt
Interest rate (as a percent)		4.625%	4.625%	4.625%
Principal (Currency Denomination)		$ 549,997,000
Total principal amount		$ 549,997,000			549,997,000
Notes and bonds payable | 5.050% Notes due 2026
Debt
Interest rate (as a percent)		5.05%	5.05%	5.05%
Principal (Currency Denomination)		$ 500,000,000
Total principal amount		$ 500,000,000			0
Notes and bonds payable | 0.750% Notes due 2026
Debt
Interest rate (as a percent)		0.75%	0.75%	0.75%
Principal (Currency Denomination)		$ 325,000,000
Total principal amount		$ 325,000,000			325,000,000
Notes and bonds payable | 4.875% Notes due 2026
Debt
Interest rate (as a percent)		4.875%	4.875%	4.875%
Principal (Currency Denomination)		$ 599,997,000
Total principal amount		$ 599,997,000			599,997,000
Notes and bonds payable | 4.125% Notes due 2026
Debt
Interest rate (as a percent)		4.125%	4.125%	4.125%
Principal (Currency Denomination)		$ 650,000,000
Total principal amount		$ 650,000,000			650,000,000
Notes and bonds payable | 1.875% Notes due 2027
Debt
Interest rate (as a percent)		1.875%	1.875%	1.875%
Principal (Currency Denomination) | £			£ 250,000,000
Total principal amount		$ 305,075,000			301,225,000
Notes and bonds payable | 3.000% Notes due 2027
Debt
Interest rate (as a percent)		3.00%	3.00%	3.00%
Principal (Currency Denomination)		$ 600,000,000
Total principal amount		$ 600,000,000			600,000,000
Notes and bonds payable | 1.125% Notes due 2027
Debt
Interest rate (as a percent)		1.125%	1.125%	1.125%
Principal (Currency Denomination) | £			£ 400,000,000
Total principal amount		$ 488,120,000			481,960,000
Notes and bonds payable | 3.950% Notes due 2027
Debt
Interest rate (as a percent)		3.95%	3.95%	3.95%
Principal (Currency Denomination)		$ 599,873,000
Total principal amount		$ 599,873,000			599,873,000
Notes and bonds payable | 3.650% Notes due 2028
Debt
Interest rate (as a percent)		3.65%	3.65%	3.65%
Principal (Currency Denomination)		$ 550,000,000
Total principal amount		$ 550,000,000			550,000,000
Notes and bonds payable | 3.400% Notes due 2028
Debt
Interest rate (as a percent)		3.40%	3.40%	3.40%
Principal (Currency Denomination)		$ 599,816,000
Total principal amount		$ 599,816,000			599,816,000
Notes and bonds payable | 2.200% Notes due 2028
Debt
Interest rate (as a percent)		2.20%	2.20%	2.20%
Principal (Currency Denomination)		$ 499,959,000
Total principal amount		$ 499,959,000			499,959,000
Notes and bonds payable | 4.700% Notes due 2028
Debt
Interest rate (as a percent)		4.70%	4.70%	4.70%
Principal (Currency Denomination)		$ 400,000,000
Total principal amount		$ 400,000,000			0
Notes and bonds payable | 3.250% Notes due 2029
Debt
Interest rate (as a percent)		3.25%	3.25%	3.25%
Principal (Currency Denomination)		$ 500,000,000
Total principal amount		$ 500,000,000			500,000,000
Notes and bonds payable | 3.100% Notes due 2029
Debt
Interest rate (as a percent)		3.10%	3.10%	3.10%
Principal (Currency Denomination)		$ 599,291,000
Total principal amount		$ 599,291,000			599,291,000
Notes and bonds payable | 4.850% Notes due 2030
Debt
Interest rate (as a percent)		4.85%	4.85%	4.85%
Principal (Currency Denomination)		$ 600,000,000
Total principal amount		$ 600,000,000			0
Notes and bonds payable | 3.160% Notes due 2030
Debt
Interest rate (as a percent)		3.16%	3.16%	3.16%
Principal (Currency Denomination) | £			£ 140,000,000
Total principal amount		$ 170,842,000			168,686,000
Notes and bonds payable | 4.875% Notes due 2030
Debt
Interest rate (as a percent)		4.875%	4.875%	4.875%
Principal (Currency Denomination) | €				€ 550,000,000
Total principal amount		$ 582,120,000			0
Notes and bonds payable | 1.625% Notes due 2030
Debt
Interest rate (as a percent)		1.625%	1.625%	1.625%
Principal (Currency Denomination) | £			£ 400,000,000
Total principal amount		$ 488,120,000			481,960,000
Notes and bonds payable | 3.250% Notes due 2031
Debt
Interest rate (as a percent)		3.25%	3.25%	3.25%
Principal (Currency Denomination)		$ 950,000,000
Total principal amount		$ 950,000,000			950,000,000
Notes and bonds payable | 3.180% Notes due 2032
Debt
Interest rate (as a percent)		3.18%	3.18%	3.18%
Principal (Currency Denomination) | £			£ 345,000,000
Total principal amount		$ 421,004,000			415,691,000
Notes and bonds payable | 5.625% Notes due 2032
Debt
Interest rate (as a percent)		5.625%	5.625%	5.625%
Principal (Currency Denomination)		$ 750,000,000
Total principal amount		$ 750,000,000			750,000,000
Notes and bonds payable | 2.850% Notes due 2032
Debt
Interest rate (as a percent)		2.85%	2.85%	2.85%
Principal (Currency Denomination)		$ 699,655,000
Total principal amount		$ 699,655,000			699,655,000
Notes and bonds payable | 1.800% Notes due 2033
Debt
Interest rate (as a percent)		1.80%	1.80%	1.80%
Principal (Currency Denomination)		$ 400,000,000
Total principal amount		$ 400,000,000			400,000,000
Notes and bonds payable | 1.750% Notes due 2033
Debt
Interest rate (as a percent)		1.75%	1.75%	1.75%
Principal (Currency Denomination) | £			£ 350,000,000
Total principal amount		$ 427,105,000			421,715,000
Notes and bonds payable | 4.900% Notes due 2033
Debt
Interest rate (as a percent)		4.90%	4.90%	4.90%
Principal (Currency Denomination) | £			£ 600,000,000
Total principal amount		$ 600,000,000			0
Notes and bonds payable | 2.730% Notes due 2034
Debt
Interest rate (as a percent)		2.73%	2.73%	2.73%
Principal (Currency Denomination) | £			£ 315,000,000
Total principal amount		$ 384,395,000			379,544,000
Notes and bonds payable | 5.125% Notes due 2034
Debt
Interest rate (as a percent)		5.125%	5.125%	5.125%
Principal (Currency Denomination) | €				€ 550,000,000
Total principal amount		$ 582,120,000			0
Notes and bonds payable | 5.875% Bonds due 2035
Debt
Interest rate (as a percent)		5.875%	5.875%	5.875%
Principal (Currency Denomination)		$ 250,000,000
Total principal amount		$ 250,000,000			250,000,000
Notes and bonds payable | 3.390% Notes due 2037
Debt
Interest rate (as a percent)		3.39%	3.39%	3.39%
Principal (Currency Denomination) | £			£ 115,000,000
Total principal amount		$ 140,335,000			138,563,000
Notes and bonds payable | 2.500% Notes due 2042
Debt
Interest rate (as a percent)		2.50%	2.50%	2.50%
Principal (Currency Denomination) | £			£ 250,000,000
Total principal amount		$ 305,075,000			301,225,000
Notes and bonds payable | 4.650% Notes due 2047
Debt
Interest rate (as a percent)		4.65%	4.65%	4.65%
Principal (Currency Denomination)		$ 550,000,000
Total principal amount		$ 550,000,000			$ 550,000,000
Notes and bonds payable | 5.050% Notes due January 2026
Debt
Interest rate (as a percent)	5.05%	5.05%	5.05%	5.05%
Principal (Currency Denomination)	$ 500,000,000	$ 500,000,000.0