Subsequent Events (Details)	1 Months Ended
	Apr. 30, 2022 USD ($) $ / shares	Apr. 30, 2022 GBP (£)	Mar. 31, 2022 USD ($)
Unsecured debt | Revolving credit facility
Subsequent Event [Line Items]
Maximum borrowing capacity | $			$ 3,000,000,000
Subsequent event
Subsequent Event [Line Items]
Common stock dividend declared (in dollars per share) | $ / shares	$ 0.2470
Subsequent event | Unsecured debt | Revolving credit facility
Subsequent Event [Line Items]
Maximum borrowing capacity | $	$ 4,250,000,000
Subsequent event | Notes payable | Private placement agreement, April 2022
Subsequent Event [Line Items]
Principal amount		£ 600,000,000
Weighted average tenor (in years)	10 years 6 months	10 years 6 months
Effective yield (as a percent)	3.22%	3.22%
Subsequent event | Notes payable | Private placement agreement, due 2030
Subsequent Event [Line Items]
Principal amount		£ 140,000,000
Subsequent event | Notes payable | Private placement agreement, due 2032
Subsequent Event [Line Items]
Principal amount		345,000,000
Subsequent event | Notes payable | Private placement agreement, due 2037
Subsequent Event [Line Items]
Principal amount		£ 115,000,000