Notes Payable - General (Details)	1 Months Ended
	Jan. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Jan. 31, 2022 GBP (£)	Jul. 31, 2021 GBP (£)	Oct. 31, 2020 GBP (£)
5.050% Notes due January 2026 | Interest rate swaps
Debt
Length of swap contracts	3 years
Notes and bonds payable
Debt
Total principal amount		$ 16,383,189,000		$ 14,114,156,000
Unamortized net premiums, deferred financing costs and basis adjustment on interest rate swaps designated as fair value hedge		92,400,000		163,857,000
Net payable amount		$ 16,475,589,000		14,278,013,000
Notes and bonds payable | 4.600% Notes due 2024
Debt
Interest rate (as a percent)		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%
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%
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%
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%
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%
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%
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%
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%		0.01875%
Principal (Currency Denomination) | £			£ 250,000,000		£ 250,000,000
Total principal amount		$ 317,700,000		301,225,000
Notes and bonds payable | 3.000% Notes due 2027
Debt
Interest rate (as a percent)		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%			0.01125%
Principal (Currency Denomination) | £			£ 400,000,000			£ 400,000,000
Total principal amount		$ 508,320,000		481,960,000
Notes and bonds payable | 3.950% Notes due 2027
Debt
Interest rate (as a percent)		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%
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%
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%
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%
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%
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%
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%
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%
Principal (Currency Denomination) | £			£ 140,000,000
Total principal amount		$ 177,912,000		168,686,000
Notes and bonds payable | 1.625% Notes due 2030
Debt
Interest rate (as a percent)		1.625%	1.625%				0.01625%
Principal (Currency Denomination) | £			£ 400,000,000				£ 400,000,000
Total principal amount		$ 508,320,000		481,960,000
Notes and bonds payable | 3.250% Notes due 2031
Debt
Interest rate (as a percent)		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%
Principal (Currency Denomination) | £			£ 345,000,000
Total principal amount		$ 438,426,000		415,691,000
Notes and bonds payable | 5.625% Notes due 2032
Debt
Interest rate (as a percent)		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%
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%
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%			0.0175%
Principal (Currency Denomination) | £			£ 350,000,000			£ 350,000,000
Total principal amount		$ 444,780,000		421,715,000
Notes and bonds payable | 4.900% Notes due 2033
Debt
Interest rate (as a percent)		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%
Principal (Currency Denomination) | £			£ 315,000,000
Total principal amount		$ 400,302,000		379,544,000
Notes and bonds payable | 5.875% Bonds due 2035
Debt
Interest rate (as a percent)		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%
Principal (Currency Denomination) | £			£ 115,000,000
Total principal amount		$ 146,142,000		138,563,000
Notes and bonds payable | 2.500% Notes due 2042
Debt
Interest rate (as a percent)		2.50%	2.50%		0.025%
Principal (Currency Denomination) | £			£ 250,000,000		£ 250,000,000
Total principal amount		$ 317,700,000		301,225,000
Notes and bonds payable | 4.650% Notes due 2047
Debt
Interest rate (as a percent)		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%
Principal (Currency Denomination)	$ 500,000,000	$ 500,000,000.0